SKF - Industrial Shaft Seals

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Product data – general Storage and handling of seals General The following guidelines for the storage and cleaning of seals are valid for natural and synthetic elastomer materials and are in accordance with ISO 2230 and DIN 7716 standards. The storage guidelines set forth in DIN 7716 are valid for long-term storage. Unfavourable storage conditions and im proper handling can change the physical properties of most products made from natural or synthetic rubber. This can result in hardening or softening, permanent deformation, peeling or cracks, which can lead to a shortened service life or render the products altogether useless. These changes can be brought about by storing the products under stress or load or from the influence of oxygen, ozone, heat, light, moisture or solvents. When stored properly, elastomer products generally retain their properties for several years. Storage The storage area should be cool, dry, moderately ventilated and there should be as little dust as possible. Outdoor storage without protection should be avoided. The appropriate storage temperature depends on the elastomer. The most favourable storage temperature for synthetic rubber seals is 15 to 25 °C (60 to 80 °F). Elastomer products that have been subjected to low temperatures during transport or storage may become stiff. They should therefore be warmed and kept at a temperature of at least 20 °C (70 °F) before being unpacked and used in order to prevent exposure to condensation. In heated storage rooms, the products should be shielded from the heat source. There should be at least 1 m (3 ft.) between the packages and the source of heat. In rooms where a heater with a fan is used, the distance should be greater. Storage in damp rooms should be avoided because of the risk of condensation. A storage facility with relative humidity below 65% is excellent. Seals should be protected from light, particularly direct sunlight or artificial light with a high proportion of UV radiation. Any windows in the store should therefore be covered with a red or orange coating (never blue). Ordinary light bulbs are preferred for illumination. Seals should be wrapped or stored in airtight containers, protecting them from atmospheric changes and particularly against drafts. Because ozone is particularly damaging, steps must be taken to make sure that no ozone is produced in the storage facility as the result of using electric motors or other equipment that can produce sparks or other electric discharges. Combustion fumes and vapours that can produce ozone as the result of photochemical processes should be exhausted. For this reason, solvents, fuels, lubricants, chemicals, acids, disinfectants etc. should not be stored in the same room as the seals. Elastomer products should not be subjected to tension, compression or other forms of load during storage as this can produce permanent deformations and cracks. Seals should therefore not be hung on hooks during storage. Certain metals, especially copper and manganese, damage elastomer products. Contact with these metals should therefore be avoided and the seals should be covered with layers of paper or polyethylene to prevent such contact. In case it is necessary to repack the seals, packaging and covering materials should not contain substances such as copper or alloys containing copper, petroleum, oil etc. that can cause damage to the seals. The packaging materials should not contain softeners. If the products are powdered, suitable powders are talcum, chalk, finely divided glimmer and rice starch. Seals made of different materials should not be in contact with each other. This is particularly important when the seals are different in colour as this will avoid discolouration. Seals should be stored for the shortest period of time possible. Where long-term storage is involved, care should be taken that newly arrived products are kept separate from those already in storage to enable use of seals on a first in, first out basis. 44
Cleaning and maintenance In the event that cleaning is necessary, elastomer products should be cleaned with warm, soapy water that does not exceed 30 °C (85 °F), and air dried at room temperature. Solvents such as trichloroethylene, carbon tetrachloride or hydrocarbons should not be used, nor should sharp-edged objects, wire brushes, emery cloth or sandpaper. Elastomer/metal combinations can be cleaned using a 1:10 mixture of glycerine and alcohol. 1 45
Page 1 and 2: Industrial shaft seals
Page 3 and 4: 1 Product data - general ..........
Page 5 and 6: Meeting the toughest challenges Our
Page 7 and 8: Bearings SKF is the world leader in
Page 9 and 10: 2 Radial shaft seals ..............
Page 11 and 12: Foreword This edition of the Indust
Page 13 and 14: Product data - general 1 Industrial
Page 15 and 16: Profile overview selection Radial s
Page 17 and 18: 1 Cassette seals, SKF Mudblock MUD1
Page 19 and 20: V-ring Fig. 1 Selection of seal des
Page 21 and 22: CRW1 seal CRW1 seals in tandem Fig.
Page 23 and 24: CRW1 seals Fig. 16 Separating two l
Page 25 and 26: CRWA5 seal Fig. 19 Pressure differe
Page 27 and 28: V-ring seal V-ring seals Fig. 23 Fi
Page 29 and 30: Counterface design The service life
Page 31 and 32: Seal materials Cases and inserts Me
Page 33 and 34: Nitrile rubber (R) The term nitrile
Page 35 and 36: Polyacrylate elastomer Polyacrylate
Page 37 and 38: Chemical resistance In table 2, Che
Page 39 and 40: cont. table 2 Chemical resistance M
Page 45: cont. table 2 Chemical resistance M
Page 50 and 51: Metal-reinforced seals ............
Page 52 and 53: Radial shaft seals General Radial s
Page 54 and 55: Radial shaft seals Fig. 2 Metal-cas
Page 56 and 57: Radial shaft seals Outside diameter
Page 58 and 59: Radial shaft seals Table 2 Outside
Page 60 and 61: Radial shaft seals As a consequence
Page 62 and 63: Radial shaft seals Diagram 3 Maximu
Page 64 and 65: Radial shaft seals Diagram 4 Maximu
Page 66 and 67: Radial shaft seals Diagram 5 Permis
Page 68 and 69: Radial shaft seals Friction To be e
Page 70 and 71: Radial shaft seals Table 4 Chemical
Page 72 and 73: Radial shaft seals Shaft requiremen
Page 74 and 75: Radial shaft seals exces sive seali
Page 76 and 77: Radial shaft seals Housing bore req
Page 78 and 79: Radial shaft seals Tolerances The h
Page 80 and 81: Radial shaft seals Installation sle
Page 82 and 83: Radial shaft seals Seals without me
Page 84 and 85: Radial shaft seals Cover plates Sea
Page 86 and 87: Radial shaft seals Multiple HDS sea
Page 88 and 89: Radial shaft seals Installation pro
Page 90 and 91: Radial shaft seals Designation syst
Page 92 and 93: Radial shaft seals Seals for genera
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Radial shaft seals - HMS5 and HMSA1
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Radial shaft seals CRW1, CRWA1, CRW
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Radial shaft seals - CRW1, CRWA1, C
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Radial shaft seals CRW5 and CRWA5 s
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Radial shaft seals - CRW5 and CRWA5
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Radial shaft seals HDW1 seals HDW1
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Radial shaft seals CRS1, CRSH1, CRS
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Radial shaft seals - CRS1, CRSH1, C
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Radial shaft seals PTFE radial shaf
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Radial shaft seals Table 14 Materia
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Radial shaft seals HM and TL seals
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Radial shaft seals - HM and TL seal
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Radial shaft seals X seals, sealing
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Radial shaft seals - X seals - metr
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Radial shaft seals - X seals - inch
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Radial shaft seals Seals for heavy
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Radial shaft seals HDSA and HDSB ea
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Radial shaft seals Additional desig
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Radial shaft seals HSF fabric-reinf
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Radial shaft seals HS split seals I
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Radial shaft seals SKF Springlock T
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Radial shaft seals Table 19 Standar
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Radial shaft seals - HDS7 - metric
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Radial shaft seals - HDS7 - inch di
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Radial shaft seals - HDS7 - inch di
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Radial shaft seals - HDS7K - metric
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Radial shaft seals - HDS7K - inch d
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Radial shaft seals - HDL - metric d
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Radial shaft seals - HDL - inch dim
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Radial shaft seals - HDS1, HDS2 and
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Radial shaft seals - HDS1K - inch d
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Radial shaft seals - HDS2K - metric
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Radial shaft seals - HDSF and HDSH
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Radial shaft seals - HDSA and HDSB
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Radial shaft seals - HDSE1 - metric
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Radial shaft seals - HDSD and HDSE
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Radial shaft seals - SBF - metric d
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Radial shaft seals - HSF1 (split) a
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Radial shaft seals - HSF9 - metric
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Radial shaft seals - HS4 and HS5 -
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Radial shaft seals - HS4 and HS5 -
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Radial shaft seals - HS6, HS7 and H
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Cassette seals General ............
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Design features All SKF Mudblock se
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Fig. 2 SKF Mudblock seal MUD5 Half
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Wear sleeves General To seal effici
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Wear sleeves SKF Speedi-Sleeve Gold
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Wear sleeves Fig. 6 Fig. 7 Fig. 8 I
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SKF Speedi-Sleeve - metric dimensio
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SKF Speedi-Sleeve - inch dimensions
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Wear sleeves Wear sleeves for heavy
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Wear sleeves Using LDSLV designs Th
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Wear sleeves for heavy industrial a
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Track pin seals General ...........
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SKF Trackstar seals provide several
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Dimensions Spacer ring Bore Operati
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Metal face seals General SKF metal
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Metal face seals Permissible operat
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Metal face seals - HDDF - inch and
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Metal face seals - HDDF - inch and
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V-ring seals General ..............
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low but sufficient enough to mainta
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Main V-ring functions V-rings are s
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Sliding velocities V-rings can oper
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Counterface A fine-turned counterfa
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Shaft requirements Sharp edges, nic
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Dimensions Shaft diameter Seal insi
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Dimensions Design Lip Shaft diamete
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Installation The inside diameter of
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Dimensions Shaft Case outside Seal
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469 7.4
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Axial clamp seals General SKF axial
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Axial clamp seals Installation inst
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Axial clamp seals - CT1 and CT4 - m
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Axial clamp seals - CT1 and CT4 - m
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Axial clamp seals - CT1 and CT4 - i
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Product index Design Product group
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Design Product group Product table
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SKF - Industrial Shaft Seals

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