LuytexR - Composite Materials - Dilanda.it

Luytex R - Composite Materials 

Contents 

General Introduction ........................................................................ 3 

Applications ................................................................................ 4 

Quality Criteria ............................................................................. 4 

Selection Criteria ........................................................................... 5 

Material Properties .......................................................................... 6 

Installation Possibilities ....................................................................... 9 

Machining Instructions ....................................................................... 10 

Raw Materials - Luytex R C361 on Stock ........................................................ 11 

Standard Plain Bearings ..................................................................... 12 

Installation Recommendations .............................................................. 12 

Design Guide for Non Standard Products ....................................................... 14 


Slydring R .................................................................................. 18 


Marine Applications ......................................................................... 20 

Safety Data Sheet ........................................................................... 21 

Storage ................................................................................... 21 

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1


ISO 9001 ISO 9002 

The information in this brochure is based on many decades of experience in the manufacture and application of sealing 

and bearing systems. However, unknown parameters and conditions may restrict general statements during usage. It is 

vital that customers satisfy themselves as to the suitability of individual products through adequate testing. For this reason, 

and due to the wide range of applications of our products, Busak+Shamban can accept no liability as to the suitability or 

correctness of our recommendations in individual cases. 

The application limits for pressure, temperature and speed given in this catalogue are maximum values determined in the 

laboratory. During practical applications it should be remembered that due to the interaction of the operating parameters, 

the maximum values must be set correspondingly lower. For exceptional operating conditions, please contact your 

Busak+Shamban representative. 

This edition supersedes all previous brochures. 

e Busak+Shamban 2000. All rights reserved. 

R All registered trademarks. The turquoise colour is a trademark for B+S products. 

This brochure, or any part thereof, may not be reproduced without our permission. 

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General Introduction 

Description 

Luytex R materials are composites of fine weave fabrics 

impregnated with special thermosetting polyester resins. 

In order to improve their mechanical properties - in 

particular the friction coefficient - special additives can be 

incorporated in the resin. 

Luytex R materials are suitable for widely differing 

applications due to their wide range of mechanical and 

physical properties. 

Design 

Structural elements such as bushings, drums, slide plates, 

rollers, etc. are supplied ready for installation according 

to the customer’s drawings or to our own designs. 

Luytex R materials are also available as semi-finished 

products in the form of : 

- Tubes 

- Rods 

- Sheets 

- Discs 

Characteristics 

Due to their high load bearing capability and good sliding 

properties, Luytex R materials can be in many cases used 

as bearing materials for metallic parts. By manufacturing 

with additional lubricants, the sliding properties can be 

further enhanced, particularly for dry running applications. 

The high permissible specific surface pressures also 

provide long service life. 

Low specific weight allows dimensionally stable light weight 

machine parts to be produced. 

This can be a particularly important factor with large 

diameters where a similar part in bronze would be five 

times heavier. 

Advantages 

From the point of view of its price / performance ratio, 

Luytex R represents an effective alternative to the 

conventional metallic bearing materials. The use of these 

materials provides effective solutions to a large number of 

applications. 

Main advantages: 

- High load bearing capacity 

- Generally less wear than metallic bearing materials 

- Lower coefficients of friction 

- Damping of mechanical vibrations 

- Easy to machine and install 

- Swell in water < 0,1 % 

- Long service life 

- Savings in weight with large components reduce freight 

charges 

- Ideal for use in fresh or salt water 

- Good chemical resistance 

- Eliminates local stress concentrations, edge loading, etc. 

- Metal / plastic pairing eliminates fretting 

- Contains no environmentally hazardous or 

toxic substances 

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3


Applications 

Areas of Applications 

A few of the potential applications of Luytex R materials 

are given below as examples : the choice of suitable 

materials for particular application can be found in table I 

on page 5. 

Water-Lubricated Application: 

Car washing machines 

Spray head bearings 

Scale breakers 

Paper machine bearings 

Grinding machines 

Water filtration plants 

Nuclear reactors 

Sewage work 

Lubrication by the Process Fluid: 

Textile machines 

Pickling plants 

Anodizing baths 

Pump bearings 

Chemical and petrochemical industry 

Oil and Grease Lubrication: 

Automobile industry 

Conveying plants and crane construction 

Coal mining 

Mining machinery 

Press guides 

Highly flexible couplings 

Construction machines 

Dry Running: 

Machines for the foodstuffs industry 

Electrical industry 

Railway locomotive construction 

Supporting bearings 

Construction machines 

Fields of Applications 

Due to their good mechanical and physical properties, 

Luytex R materials are outstandingly suited for use as 

guides and bearings subject to high loads, e.g. 

- As guide rings, in hydraulics applications, guides and 

slideways for reciprocating pistons, rods, plungers, 

slide and guide rails 

- As bearings, thrust washers and bearing shells for 

rotating and oscillating drums, shafts, bushings and 

spindles 

Most commercially available oils and greases without 

solid additives (e.g. molybdenum disulphide) can be used 

for lubrication. The chemical resistance of Luytex R allows 

many process fluids to be used as lubricants. When 

material C321, C322, C361, C380 is used, water can be 

used as lubricant (swell in water < 0,1%). 

The wear of Luytex R materials can be less than that of 

conventional metallic bearing materials. Therefore, 

depending on the application, longer service life can be 

achieved with a simultaneous improvement in the 

properties of the components. 

Quality Criteria 

The cost-effective use of bearings is highly influenced by 

the quality criteria applied in production. Bearings 

manufactured by Busak+Shamban are continuously 

monitored according to strict quality standards from 

material acquisition through to delivery. 

Certification of our production plant in accordance with 

international standard EN ISO 9001 meets the specific 

requirements for quality control and management of 

purchasing, production and marketing functions. 

Our quality policy is consistently controlled by strict 

procedures and guidelines which are implemented within 

all strategic areas of the company. 

All testing of materials and products is performed in 

accordance with accepted test standards and 

specifications. 

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Selection Criteria 

Table I 

Materials 

Material No. Properties Applications Material Colour 1) 

C320 High wear resistance 

Rod Slydring R in hydraulic 

cylinders, guide and bearing 

Polyester resin 

Polyester fine mesh 

grey 

(TLG) 

bushes, slide pads, etc. 

Additive: graphite 

C321 

(TL) 

C322 

(TLM) 

C324 

(NLD) 

C329 

(TLF) 

C333 

(TLP) 

C338 

(NL25) 

C361 

(TL60) 

C362 

(TLC) 

C363 

(SLG) 

C367 

(TX) 

C380 

(TL61) 

Orkot R 

TLM 

Marine 

High permissible surface pressure, 

vibration damping 

High compressive strength, 

low swell rate, 

resistant to gamma radiation 

Low swell rate, 

resistant to sea water 

High temperature resistance 

+ 250C 

Bushes, sheets, 

parts for insulation, parts with close 

tolerances, food industry grade, 

agreed FDA 

Sea water applications in 

ship-building, marine engineering 

and offshore installations 

Application at high temperatures 





Additive: molybdenum 

Vinylester resin 

Nomex fibre mesh 

Fire retardant Mining, plants with a high fire risk Polyester resin 


Fire retardant additives 

Good sliding properties, 

good stick-slip behaviour 

High temperature resistance 

+ 250_C 

Excellent sliding properties 

Acid resistant to pH = 3 

Good sliding properties 

Lower compressive strength 

Low friction 

High wear resistance 

Good sliding properties 

Exceptional wear resistance 

Low swell rate 

Low friction 

Highlighted compounds are standard materials. 

Moving machine parts with 

low friction 

High temperatures 

High pv values 

Preferred material for non standard 

and plain bearings 

Chemical plant engineering, 

pumps 

Pads for guiding 

Rotating shafts 

Pads 

Dry running 

Standard material for Slydring R 

Rudder bearings, stabilizer bearings 

Water lubricated propeller shaft 

bearings 

Deck machinery bearings 

The designations in brackets indicate the replaced designations used in earlier catalogues. 



Additive: PTFE 

Vinylester resin 

Nomex fiber mesh 

Additive: PTFE + MoS2 







Special polyester 

reinforcement 

Additive: graphite 


Polyester fine mesh and 

PTFE 



Additive: PTFE 




white 

grey 

milky-white 



grey 

blue 


grey 

white and 

black 

turquoise* 

1) If components of Luytex R materials are used at visible points of machines, construction vehicles, etc. the materials can also be pigmented in certain instances. 

* The turquoise colour is a trademark of the B+S Group. 

grey 

Special grades can be offered to suit specific requirements such as improved resistance to alkalis, resistance to acids, 

fire retardant additives, colour pigments for identification, etc. The specialised grades are listed on individual data sheets 

which can be supplied on request. 

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5


Material Properties 

Table II 

Mechanical and Physical Properties 

Material 

properties 

C380 

C321 

Material No. 

C361 

C320 

C367 

C324 

Tensile strength N/mm 2 55 65 55 60 

Compressive strength, static, 

N/mm 2 

(perpendicularly to the fabric), 

fully chambered 

Compressive strength, static, 

N/mm 2 

(parallel to the fabric) 

Modulus of elasticity in 

tension N/mm 2 

BS2782-320E 

345 345 345 350 

95 92 97 100 

3200 3200 3200 4300 

Density g/cm 3 1,25 1,3 1,25 1,20 

Water absorption %


Chemical Resistance 

Luytex R materials are resistant to many media and 

chemicals. Luytex R does not corrode, is resistant to oils 

and greases and is not attacked by many solvents, 

inorganic solutions and weak acids. 

Water or other chemical liquids act as lubricants on Luytex R 

materials and reduce friction. Observe the application 

recommendations ! 

Luytex R is not resistant to ketones chlorinated solvents, 

strong alkalines and strongly oxidizing chemicals. The 

following resistance list is intended only as a guide line. 

Where applications involve aggressive media, please 

contact the local B+S Organization. 

Table V 

List of Chemical Resistances 

Material No. 

C320/C321/C380/C361 

Medium +20C +50C 

Acetic acid, 15 % A B 

Acetic acid, 100 % C C 

Acetone, 15 % A B 

Acetone, 100 % C C 

Ammonia, aqueous C C 

Ammonia, carbonated A B 

Ammonia, nitrous A A 

Ammonia water C C 

Benzene A B 

Bleaching liquors A B 

Brake fluid ATE, DOT4 C C 

Carbon tetrachloride A A 

Chlorinated lime A A 

Chlorinated sodium A A 

Chlorine - low concentration A B 

Chloroethane A A 

Citric acid A A 

Creosote A A 

Ethyl alcohol, 15 % A A 

Ethyl alcohol, 100 % A A 

Ethylene glycol A A 

Fatty acids A A 

Fluide HEE A A 

Formaldehyde C C 

Hexone C C 

Hydrogen sulphide A A 

Material No. 

C320/C321/C380/C361 

Medium +20C +50C 

Kerosin A A 

Lactic acid A A 

Mineral oil A A 

Naphthaline A A 

Nitric acid, 15 % A B 

Nitric acid, 100 % C C 

Nitrogen A A 

Oxalic acid A A 

Petroleum A A 

Phathallic acid A A 

Phosphoric acid A A 

Skydrol A A 

Slaked lime C C 

Sodium carbonate, 25 % A A 

Sodium carbonate, 100 % B C 

Sodium hydroxide C C 

Sodium nitrite A A 

Sulphuric acid, 50 % A A 

Sulphuric acid, 100 % C C 

Trichloroethylene C C 

Water A A 

The symbols mean: 

A = Good resistance 

B = Resistant for limited application 

C = Not resistant 

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Friction Characteristics 

Luytex R materials have low coefficients of friction which 

can be improved even further by the use of appropriate 

lubricants (oil, oil emulsions, grease). Under comparable 

loads, outstanding coefficients of friction are also 

attainable with water and aqueous solutions. 

The following table shows the coefficients of friction for 

various Luytex R materials as a function of lubrication and 

peripheral speed. 

Table VI 

Material 

No. 

C320 

C321 

C361 

Coefficients of Friction, Lubricated 

Lubricant 

dry water water 

emulsion 

oil 

emulsion 

oil 

0,12 - 0,25 0,01 0,013 0,019 0,020 

C367 0,06 - 0,23 -- -- -- -- 

Test conditions: 

Mating surface: Stainless steel (1.4300) 

Peripheral speed: 0,45 m/s 

Compressive load: 15,4 N/mm 2 

Sliding Speed and Load 

Low friction bearings must be dimensioned such that 

transverse forces can be reliably absorbed. Care must be 

taken that the maximum compressive load of 80 N/mm 2 

for rotational movement, onto the projected surface, is not 

exceeded. This value is heavily dependent on the sliding 

speed. At higher sliding speeds, the permissible load 

decreases. A guide value of pv = 600 Kg/cm 2 . m/min for 

dry running can be used. 

Radiation Resistance 

In nuclear engineering, bearing materials are required 

which must work without oil or grease lubrication. Their 

mechanical properties must not be degraded by high 

doses of radiation. 

Material C321 has outstanding resistance to the effects of 

radiation. 

Table VII shows that the tensile and the compressive 

strength drop noticeably under high doses of radiation. 

Table VII 

Material 

properties* 

Decrease in Strength Properties on 

Exposure to Radioactive Radiation 

Control 

values 

before 

radiation 

Value after exposure to 

radiation 

1x10 6 

Gray 

(100 Mrad) 

3x10 6 

Gray 

(300 Mrad) 

10 x 10 6 

Gray 

(1000 Mrad) 

Tensile strength 

N/mm 2 77 60 41 22 

Compressive 

strength, static, 

(perpendicularly 

to fabric) 

N/mm 2 339 299 243 185 

Compressive 

strength, static 

(parallel to 

fabric) 

N/mm 2 103 150 124 95 

Modulus of 

elasticity in 

3340 4070 3690 3350 

tension N/mm 2 

* The quoted values were determined in tests. 

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Deformation and Elasticity 

Luytex R materials exhibit elastic deformation under 

compressive loads.The plastic or permanent deformation 

can be ignored as long as the permissible load of 

120 N/mm 2 is not exceeded. Under the technically 

permissible load, elastic deformation is approx. 10 % of 

the material thickness. 

These figures are valid for compressive loads 

perpendicular to the direction of lamination. It should also 

be noted that permissible load and deformation are 

heavily dependent on temperature. 

Recommendations for the correct load direction as a 

function of the different types of load are shown in figure 

2. These recommendations apply for all laminated guide 

materials. The load in the axial direction on collared 

bearings (towards the collar or flange) should be kept as 

small as possible. The same applies to all applications of 

Luytex R in which flexural or shearing loads are to be 

expected which run parallel to the fabric layers (e.g. belt 

pulleys, rollers, etc.). 

Types of load 

Compressive 

Tensile 

Flexural 

Shearing 

Recommended 

Not recommended 

Installation Possibilities 

Press-fit connections - Shrinkage 

In practice, bearings preferably have a press-fit. In order 

to achieve sufficient bush retention the recommended 

press-fitting allowances should be observed. 

An adequate interference fit is assured only at operating 

temperatures of up to approx. +60_C. Due to differing 

thermal expansion, a bush expands at higher 

temperatures and on cooling may lose its interference 

while increasing in length at the same time. The 

interference fit can also fail due to stress relaxation. At 

temperatures above +60_C, an additional method of 

fastening should also be used. 

Bonded Joints 

Machined parts such as bearings, slide rails, etc. are 

frequently bonded. Luytex R bearings can be used in cut 

and non-cut versions. Split bushes can also be bonded in 

position. 

For bonding of Luytex R materials, we recommend the use 

of Araldite R AV138M bonding system with hardener 

HV998. Please ask for our bonding instructions. The 

surface roughness of the face to be bonded should be 

Rmax = 10 - 15 μm. The bonding gap should preferably 

not exceed 0,05 to 0,1 mm. 

Screwed Connections 

Threaded inserts can be fitted in Luytex R materials for 

screwed connections. If large forces are to be transmitted 

by the screwed connection, it is advisable to use clearance 

holes. Metal washers should be used under screw heads 

to obtain a good distribution of compressive stress onto 

Luytex R material. 

Bearings 

When designing bearings, care should be taken to insure 

the sliding surface is parallel or concentric to the fabric 

layers and that the bearing load is applied 

perpendicularly to the fabric. Radial bearings should be 

designed so that the fabric layers of the Luytex R material 

run concentrically to the shaft axis. 

Axial or thrust bearings are made from sheet materials, 

with the fabric layers running at right angles to the shaft 

axis and direction of the load. 

Figure 2 

Types of load as a function of 

the fabric layers 

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9


Machining Instructions 

Luytex R should be machined dry, i.e. without coolant. 

Adequate dust extraction should be available and a 

suitable face mask should be worn. 

Turning 

Carbide-tipped tools are recommended for turning to 

obtain good surface finishes. High-speed cutters 

(HSS tools) for machining tolerances > 0,1 mm or for the 

production of small quantities. 

Cutting Angle for the Tools 

Turning 

Boring 

5_ 

10_ 

R 1-2 mm (0,04-0,08 inch) 

5_ 

15_ 

5-20 _ _ 

5_ 

Cutting speed 

For good surface finishes: 

For prolonged tool life: 

For form tools: 

Infeed 

Roughing: 

Finishing: 

6,0 m/s 

5,0 to 5,5 m/s 

4,5 to 5,0 m/s 

0,50 to 0,75 mm per revolution 

0,25 to 0,38 mm per revolution 

Milling 

As for metal machining, cutting speed are the same as for 

turning. Infeed 0,25 to 0,38 mm per milling tooth in order 

to achieve good tool service lives and prevent 

overheating. 

Drilling 

Cutting speed: 0,5 to 0,6 m/s 

Spiral drill with carbide tip 

Infeed rate: 50 to 75 mm per minute 

Grinding 

As optimum surface finishes can be achieved with other 

machining methods, grinding is seldom necessary, but 

can be carried out without problems. High speeds 

recommended. 

Figure 3 

Turning and boring 

Infeed = 

0,025 mm. 

Parting off 

3-5 _ _ 

Dust 

Adequate ventilation/dust extraction should be ensured 

during machining. 

5_ 

3_ 

3_ 

3_ 

3_ 

Figure 4 

Parting off 

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Product Range for Luytex R Materials 

Busak+Shamban supply structural and machined 

components ready for installation within the dimensional 

limits of the semi-finished products listed below. 

Parts are manufactured according to customer’s drawings 

or to our own designs. 

Busak+Shamban also offers semi-finished product 

material in the following forms for the repair of 

equipment. 

Tubes: 

For tubes up to 340 mm long 

minimum inside diameter: 

6,35 mm 

For tubes 670 mm long 

minimum inside diameter: 12,7 mm 

Maximum outside diameter: 2.200 mm 

Standard lengths: 670 mm 

Larger sizes available on request. 

Sheets: 

Minimum thickness: 1,5 mm 

Maximum thickness: 102 mm 

Maximum width: 610 mm 

Maximum length: 2.000 mm 

Standard length: 1.000 mm 


Discs: 

Minimum thickness: 1,5 mm 

Except Luytex R C367: 3,5 mm 

Maximum thickness: 60 mm 

Maximum diameter: 600 mm 

For special references, please consult the local B+S 

Organization. 

Rods: 

Minimum diameter: 

Maximum outside diameter: 

For diameters 10 mm to 39 mm 

maximum length: 

For diameters 40 mm to 305 mm 

maximum length: 


10 mm 

305 mm 

250 mm 

500 mm 

Raw Materials - Luytex R C361 on Stock 

In order to ensure immediate despatch, a stock of the following sizes is maintained. Alternatively, we can manufacture 

quickly and economically fully machined bearings, and can advise on the best approach for specific applications. 

Tubes 

Rods 

Inside 

Diameter 

mm 

Outside 

Diameter 

mm 

Length 

mm 

References 

Diameter 

mm 

Length 

mm 

References 

9,5 

19,1 

34,9 

54,0 

73,0 

96,0 

121,0 

26 

46 

66 

86 

106 

126 

151 

335 

335 

335 

335 

335 

335 

335 

HTLA26335 - C361 

HT1946335 - C361 

HT3566335 - C361 

HT5486335 - C361 

HT73A0335 - C361 

HT96A2335 - C361 

HTL2A5335 - C361 

15 

30 

55 

70 

105 

150 

100 

100 

100 

100 

100 

100 

HR0150100 - C361 

HR0300100 - C361 

HR0550100 - C361 

HR0700100 - C361 

HR1050100 - C361 

HR1500100 - C361 

Sheets 

Thickness 

mm 

Width 

mm 

Length 

mm 

5 

250 

250 

10 

250 

250 

15 

250 

250 

20 

250 

250 

These parts are not finished machined and dimensions are therefore indicative only. 

References 

HP05250250C361 

HP10250250C361 

HP15250250C361 

HP20250250C361 

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Standard Plain Bearings 

The search for improved bearing materials led to the 

development of synthetic bearings. Synthetic based 

materials have proved to be superior to metallic materials 

by virtue of their many advantages in various applications. 

This is also true under extremely difficult operating 

conditions. 

When using plain bearings, we recommend our standard 

bearings series Luytex R C361. 

To improve sliding properties, Luytex R C361 material 

contains additional PTFE and molybdenum disulphide. 

Luytex R C361 plain bearings offer the designer a number 

of advantages: 

- Weight savings in the case of large components 

(approx. 5 x less than bronze) 

- No oxidation, therefore ideally suited for use in fresh or 

salt water 

- Low swell in water =


Table VIII 

Installation Dimensions 

dh8 

mm 

DH7 

mm 

b1 

mm 

W 

mm 

F 

mm 

Diametral Running 

Clearance 

Max Load 

KN 

10 16 10 3,0 0,5 0,04 0,18 8,0 GBS100100-C361 

12 18 10 3,0 0,5 0,04 0,19 9,6 GBS100120-C361 

14 20 15 3,0 0,5 0,04 0,19 16,8 GBS100140-C361 

16 22 15 3,0 0,5 0,04 0,19 19,2 GBS100160-C361 

18 24 20 3,0 0,5 0,04 0,19 28,8 GBS100180-C361 

20 26 20 3,0 0,5 0,04 0,19 32,0 GBS100200-C361 

22 28 20 3,0 0,5 0,04 0,19 35,2 GBS100220-C361 

25 31 30 3,0 0,5 0,04 0,20 60,0 GBS100250-C361 

28 34 30 3,0 0,5 0,04 0,20 67,2 GBS100280-C361 

30 36 30 3,0 0,5 0,04 0,20 72,0 GBS100300-C361 

32 38 30 3,0 0,5 0,05 0,21 76,8 GBS100320-C361 

35 41 40 3,0 0,5 0,05 0,22 112,0 GBS100350-C361 

36 42 40 3,0 0,5 0,05 0,22 115,2 GBS100360-C361 

40 48 40 4,0 0,5 0,06 0,22 128,0 GBS100400-C361 

45 53 40 4,0 0,5 0,07 0,24 144,0 GBS100450-C361 

50 58 50 4,0 0,5 0,08 0,25 200,0 GBS100500-C361 

55 63 50 4,0 0,5 0,08 0,26 220,0 GBS100550-C361 

60 70 60 5,0 0,8 0,09 0,27 288,0 GBS100600-C361 

65 75 60 5,0 0,8 0,10 0,27 312,0 GBS100650-C361 

70 80 70 5,0 0,8 0,11 0,29 392,0 GBS100700-C361 

75 85 70 5,0 0,8 0,11 0,30 420,0 GBS100750-C361 

80 90 80 5,0 0,8 0,12 0,30 512,0 GBS100800-C361 

85 95 80 5,0 0,8 0,13 0,32 544,0 GBS100850-C361 

90 105 80 7,5 1,0 0,13 0,32 576,0 GBS100900-C361 

95 110 100 7,5 1,0 0,14 0,33 760,0 GBS100950-C361 

100 115 100 7,5 1,0 0,15 0,34 800,0 GBS101000-C361 

110 125 100 7,5 1,0 0,16 0,36 880,0 GBS101100-C361 

120 135 120 7,5 1,0 0,18 0,38 1.152,0 GBS101200-C361 

130 145 120 7,5 1,0 0,20 0,40 1.248,0 GBS101300-C361 

140 155 150 7,5 1,0 0,21 0,41 1.568,0 GBS101400-C361 

150 165 150 7,5 1,0 0,23 0,43 1.800,0 GBS101500-C361 

160 180 150 10,0 1,0 0,24 0,45 1.920,0 GBS101600-C361 

180 200 180 10,0 1,0 0,27 0,58 2.592,0 GBS101800-C361 

200 220 200 10,0 1,0 0,30 0,62 3.200,0 GBS102000-C361 

These dimensions are based on an operating temperature of 0_ to +60_C. Other dimensions can be supplied. 

Ref. 

Lead-in Chamfers 

C 

mm 

Housing D 

mm 

2,5 < 100 

3,5 > 100 

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Design Guide for Non Standard Products 

Special Bearings 

Flanges 

The best results are obtained when the bearing surface is 

parallel to, or concentric with the layers of the material 

and at right angles to the load direction. Radial bushes are 

manufactured from Luytex R material with the layers 

concentric with the axis of the rotating or sliding journal 

or pin. End or thrust bearings are made from flat laminate 

with the laminations at right angles (normal) to the journal 

axis and the end load. It is recommended that where 

bushes have integral flanges, axial loads (i.e. on the face 

of the flange) are kept to a minimum. Similarly, 

consideration must be given to the design of any 

component (e.g. pulleys) where there are likely to be 

bending or shear loads applied along the direction of 

lamination. 

Surface Finish 

The surface finish of the mating component has a major 

effect on the performance of the bearing. Surface 

roughness should ideally be between 0,8 μmand0,1μm 

R a . Suitable materials for shafts, thrust faces, etc. would 

be hardened steels, stainless, and gunmetal. Hard 

chrome plated steel surfaces cause high wear rates under 

certain conditions, and burnishing or other specialist 

surface finish treatments should be considered as an 

alternative. Contact our Technical Service Department for 

specific recommendations. The main criteria is that the 

mating surface should be free from cutting edges, 

similarly journals or thrust faces should be free of 

lubrication grooves or holes except where matched to 

non-loaded grooves in the bearing. 

1.0 

0.8 

0.7 

Recommended Minimum Interference (mm) 

0.8 

0.6 

0.4 

0.2 

0 

Figure 7 

0 100 200 300 400 

Bush outside diameter (mm) 

Recommended Bush/Housing diametral 

interference at operating temperature of 

0_ to 65_C for all Luytex R grades exept 

C324 and C338. 

Clearance (mm) 

0.6 

0.5 

0.4 

0.3 

0.2 

0.1 

0.04 

0 

0 100 200 300 400 

Shaft diameter (mm) 

Figure 8 Recommended Minimum Diametral Running 

Clearance for Luytex R bushes 

Note: 

The graph is indicative of operation at 20_C. If special 

running clearances are required (e.g. for highly loaded 

static applications), please contact the B+S Organization. 

14 

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1000 

8 

6 

4 

2 

Load (Kg/cm 2 ) 

100 

10 

8 

6 

4 

2 

8 

6 

Dry 

Greased 

4 

2 

1 

0.1 

2 4 

6 8 

1 

2 4 6 8 2 4 6 8 2 4 6 8 

10 

100 

1.000 

Velocity v (m/min.) 

140 340 

Figure 9 Limiting pv values for Luytex R Continuous Dry Running = 140 and Luytex R C320 Grease Lubrication = 340. 

Higher pv values may be used for intermittent operation 

Note: It is commonly accepted that the results of bearing testing depend to some extent on the test method used and 

on the geometry of the specimen. Manufacturers of materials may have different criteria for testing whether or 

not a materials performance is satisfactory at a given pv, therefore pv values should only be accepted as a guide 

to the performance of the material. Generally, the material will support a higher load but the pv value is restricted 

by heat generation. 

Table IX Manufacturing Tolerances for 

Luytex R Bearings 

Table X 

Minimum Wall Thickness 

for Luytex R Bearings 

Bearing 

Outside Diameter 

mm 

Manufacturing 

Tolerances 

mm 

10 - 200 0,05 

201 - 400 0,10 

> 400 Consult us 

For bearings over a length to diameter ratio of 1/1, a 

wider manufacturing tolerance may be required. 

Shaft 

Diameter 

mm 

Minimum 

Wall Thickness 

mm 

6 - 25 1,5 

26 - 50 2,5 

51 - 75 3,5 

76 - 100 5,0 

101 - 150 6,5 

151 - 200 8,0 

201 - 280 10,0 

281 - 400 12,0 

*KI= 5D=>= 

15


Installation Recommendations 

The Luytex R material should be fully supported over its 

loaded area with uniform interference fit in the case of 

bearings. A suitable lead-in chamfer should be provided 

in the housing, and drawing or pressing-in methods 

should be used, hammer blows should be avoided. 

Alternatively freeze fitting using dry ice or liquid nitrogen 

can be used. It is recommended that bearing be retained 

by shoulders whenever possible. Flat components such as 

wear pads can be retained by countersunk screws, and 

located by keeper plates where high lateral or shearing 

loads are anticipated. Luytex R can also be bonded using 

various types of adhesives, but manufacturers’ 

recommendations must be strictly followed, particularly 

with reference to pre-treatment of the surfaces. Contact 

the local B+S Organization for further details. 

Where possible, unless used as lubricants, contaminating 

or corroding liquids as well as abrasive particles should 

be excluded from the bearing interface. Sealing will also 

help to retain lubricants. 

We do not recommend the use of graphite or MoS 2 

grease, but medium consistency grease or oil, alternative 

water based fluids are acceptable. 

The thermal expansion of Luytex R bearing materials 

above 60_C can affect bush retention, therefore an 

interference fit is not recommended for these applications. 

Retention should be either by mechanical fixing, 

alternatively the use of split bearings or bonding with a 

suitable adhesive i.e. ARALDITE R AV 138 M with hardener 

HV 998 using a transition / clearance fit. 

Calculating Bush Sizes 

Bearing OD (min.) = 

Bearing OD (max.) = 

Bore closure (max.) = 

Bearing ID (min.) 

prior to fitting = 

Wall thickness (max.) = 

Wall thickness (min.) = 

Housing (max.) + Interference (min.) 

See fig. 7, page 14 

Bearing OD (min.) + Machining tolerance 

See table IX, page 15 

Bush OD (max.) - Housing (min.) 

Shaft dia. (max.) + Bore closure (max.) + Diametral running clearance (min.) 

See fig. 8, page 14 and bore closure details and notes, on page 17 

[Bearing OD (max.) - Bearing ID (min.)]/2 

Wall thickness (max.) - Manufacturing tolerance 

Fitted bearing ID (max.) =Bush ID (max.) - [Bearing OD (min.) - Housing (max.)] or 

Housing (max.) - 2 x Wall thickness (min.) 

Fitted bearing ID (min.) = Bush ID (min.) - [Bush OD (max.) - Housing (min.)] or 

Housing (min.) - 2 x Wall thickness (max.) 

The above assumes 100 % bearing interference fit transfer at 20_C ambient temperature, if larger wall thickness or higher 

temperatures are envisaged see bore closure note on page 17. 

16 

*KI= 5D=>=


Bore closure 

Luytex R recommends that bearings are designed using 

the recommended minimum wall thickness from Table X 

on page 15. 

This simplifies the bearing calculation and reduces the 

required clearance between bearing and shaft by 

minimising the thermal expansion allowance. 

For a shaft size of 55 mm dia., minimum wall thickness 

from Table X would be 3,5 mm, therefore bearing OD 

would be 55 + (2 x 3,5) = 62 mm nominal. For the 

minimum wall thickness, bore closure would be 100 % of 

bearing/housing interference from fig. 7 = 0,13 mm. 

If the bearing is to operate at 60_C then an extra 

clearance allowance due to temperature change from 

ambient (20_C) = 2 x wall thickness x coefficient of 

thermal expansion normal to laminate = 2 x 3,5 x 10 x 

10 -5 x (60 - 20) = 0,028. Total bore closure = 0,13 + 

0,028 = 0,158. 

For thick wall bearings less than 100 %, transfer will occur 

as shown on bore closure graph (fig. 10). Also an 

additional allowance for radial thermal expansion may be 

required as well as the expansion due to wall thickness. 

Please contact the local B+S Organization for further 

information. 

Bush OD (max.) 

Bush OD (min.) 

Shaft Dia (max.) 

Shaft 

Bush 

Housing 

Bush ID 

(min.) 

Manufacturing 

Tolerance (Table IX) 

Bore Closure 

Wall Thickness (max.) 

Interference (min.) (fig.7) 

Housing Dia. (max.) 

Running Clearance (fig. 8) 

Shaft Diameter (mm) 

400 

300 

200 

100 

50 

Insufficient 

Wall 

Thickness 

90% 

80% 

70% 

60% 

50% 

Excessive 

Wall Thickness 

Figure 11 

Typical bearing arrangement 

0 

0 2.5 10 20 30 40 

Wall thickness (mm) 

Figure 10 Bore closure at recommended interference. 

If the shaft / wall thickness is in the black area then 100 % 

bore reduction is assumed. 

*KI= 5D=>= 

17


Slydring R 

The function of a Slydring R is to guide the piston and 

piston rod of a working cylinder and to absorb the 

transverse forces which occur. At the same time, metallic 

contact between the sliding parts of the cylinder, e.g. 

piston and cylinder barrel or rod and cylinder head must 

be prevented. 

Installation Recommendations, 

Slydring R for Rod and Piston 

Two characteristics must be considered with respect to 

Slydring R selection 

Type of Cut 

Figure 12 shows three different types of cut which are 

available. The most frequently used standard type of cut 

is the angle cut. Rings with other types of cut are available 

on request. 

Design Type 

Slydring R have a rectangular cross section with rounded 

or chamfered edges, thus preventing edge forces in the 

corner radii of the grooves. The chamfers also serve to 

facilitate installation, e.g. when inserting into a cylindrical 

tube of guide bush. 

Slydring R are supplied with the gap necessary (dimension Z) 

for their function. Ring ends are finished as standard with an 

angle cut. 

Availability 

A full range of Slydring R are held in stock. 

Z 

Angle cut, standard design 

Z 

Straight cut, special design 

Z 

Step cut, special design 

Figure 12 Types of cut 

Luytex R Slydring R can be used in split and non-split 

versions. 

18 

*KI= 5D=>=


Installation Recommendations 

Slydring R for Rods 

Rmax. 

Z 

d2 

W 

S1 

d 

L2 

Figure 13 

Installation drawing 

Slydring R for Pistons 

Rmax. 

Z 

D 

D2 

W 

S1 

L2 

Figure 14 

Installation drawing 

For more details and dimensions please use our specific Slydrings catalogue. 

*KI= 5D=>= 

19


Marine Applications 

Characteristics 

A non-asbestos laminated material incorporating solid 

lubricants, Orkot R ’TLM Marine’ has exceptional wear 

resistance, and virtually no swell in water, giving 

dimensional stability. Orkot R ’TLM Marine’ tolerates edge 

loading and misalignment even with the heaviest loads. 

It is particularly suited to freeze fitting, without the danger 

of shattering. 

Where there are extended periods between greasing or 

where adequate water lubrication cannot be guaranteed, 

such as under light ballast conditions, Orkot R ’TLM 

Marine’ proves especially effective. 

Applications 

- Water and grease lubricated rudder bearings 

- Water lubricated propeller shaft bearings 

- Stabiliser bearings 

- Deck machinery bearings 

- Weapons handling bearings and guide strips 

- Steering gear bearings 

- Slipway pads 

- Sonar bushing and guide strips 

- Low magnetic permeability materials for mine counter 

measure vessels 

- Door bushes 

- Crane mast bearings 

Quality and Classification 

Busak+Shamban has BS5750 Pt 2 and ISO 9001 

approvals for all manufacturing operations and internal 

systems. Extensive in-house testing facilities can simulate 

a variety of conditions. 

Orkot R ’TLM Marine’ is approved by Lloyds and all major 

marine classification societies in China, Europe, India, 

Japan, Korea, Russia, and the United States, including 

Germanischer Lloyd, American Bureau of Shipping, NKK, 

Bureau Veritas, China Classification Society, Indian 

Register of Shipping, Maritime Register of Shipping St. 

Petersburg, DNV and Polish Ship Register. 

For further information, please 

Orkot R ’TLM Marine’ catalogue. 

consult our specific 

Table XI Physical and Mechanical Properties 

Typical values are as follows: 

Tensile strength 

Compressive strength normal to laminate 

Compressive strength parallel to laminate 

Hardness Rockwell 

Density 

Swell in water (% wall thickness) 

Thermal properties 

Linear expansion coefficients 

Cx10 -5 per deg. (20 - 100) 

normal to laminate 

parallel to laminate 

Fx10 -5 per deg. (86 - 212) 

normal to laminate 

parallel to laminate 

60 N/mm 2 

346 N/mm 2 

92 N/mm 2 

M100 

1,30 g/cm 3 

0,1 

9-10 

5-6 

5-6 

2-3 

ISO 179/1982 Charpy impact strength 122 KJ/m 2 

Coefficient of friction dry, static against s/steel 

at a load of 15 N/mm 2 (2130 lb/in 2 ) 0,13 

Table XII 

B+S 

Ref. No. 

Availability 

HTZWW09501TLMM 
















O/D 

(mm) 

95 

118 

150 

170 

190 

230 

305 

370 

400 

445 

480 

520 

595 

650 

735 

800 

I/D 

(mm) 

47,6 

66,7 

88,9 

108 

120,7 

146,1 

177,8 

235 

270 

295 

381 

403 

450 

500 

600 

660 

LTH 

(mm) 

500 

500 

500 

500 

600 

700 

780 

650 

650 

570 

590 

700 

710 

800 

840 

920 

WGT 

(Kg) 

3,5 

4,9 

7,5 

7,2 

12,5 

21,9 

49,1 

53,3 

57,8 

64,6 

51,4 

77,2 

109,0 

134,0 

154,0 

192,0 

The above sizes are available for immediate rudder 

repairs, special sizes for this and other marine 

applications can normally be made in 48 hours. 

20 

*KI= 5D=>=


Safety Data Sheet 

Composition 

Luytex R is a polyester resin bonded synthetic fabric 

bearing material. It is classified as a thermosetting plastic. 

In certain grades the following are added: 

Graphite Powder 

Molybdenum Disulphide 

Polytetrafluoroethylene 

Physical and Reactivity Data 

The material is inert and no known synergistic reaction 

takes place when exposed to other substances. The 

material is chemically attacked by caustic soda, alkalis 

and chlorinated solvents. 

Specific gravity: 1,25 to 1,35 g/cm 3 

Appearance: grey, white or blue 

Health and Safety Information 

No special precautions are required for the handling or 

storage of Luytex R material, other than those for the safe 

manual handling of loads. 

Eye contact: flush with water 

Irritation: seek medical attention 

Special Precautions and Protection 

During machining a non toxic dust is produced. No 

statuary operator exposure limits apply but the following 

are suggested: 

Dust: 10 mg/m 3 

Respirable dust: 5 mg/m 3 

Adequate dust extraction should be provided or dust 

particle masks should be worn. 

Safety glasses should be worn when machining or cutting. 

Fire Precautions 

Fire can be extinguished using water, foam or powder. 

Toxicity: not applicable 

Explosibility: not applicable 

The major result of combustion is carbon dioxide and 

normal precautions should be taken if a fire occurs in a 

confined area. 

Storage 

Luytex R does not require special storage conditions 

although deformation should be avoided. 

*KI= 5D=>= 

21

LuytexR - Composite Materials - Dilanda.it

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