Renold - Chain Catalogue

58 I Renold Transmission Chain Catalogue
Polymer Block
Section 1
Material code and details
Code Material Type Shore Wear Value Colour
Hardness
DIN 53516 mm3
NR Natural Rubber 65 + / – 5 160 RAL1014 Ivory
IR Isoprene Rubber (Synth. polyisoprene) - - - -
SBR Styrene-Butadiene Rubber - - - -
BR Butadiene Rubber (Polybutadiene) - - - -
EPDM Ethylene-Propylene-Diene Polymer - - - -
NBR Acronitrille Butadiene Rubber 75 + / – 5 160 RAL7034 Yellow-Grey
CR Chloroprene Rubber (Polychloroprene) 65 + / – 5 160 RAL1021 Cadmium-Yellow
AU Polyester Urethane Rubber - - - -
SI Silicone Resins 70 + / – 5 160* RAL3012 Beige-Red
FSI Fluoric Silicone Resins - - - -
FPM Fluoropolymers 75 + / – 5 160* RAL8008 Olive-Brown
PUR Polyurethane 85 + / – 5 80 RAL1007 Chrome-Yellow Transparent
PTFE Polytetrafluoroethylene - - - -
- Details available on request.
* Renold design.
RAL 1007 RAL 1014 RAL 1021 RAL 3012 RAL 7034 RAL 8008
A customer specific design, hardness and wear
specification of block is possible, but may be
subject to minimum order quantities.
Polymer Block material colour may vary from
the represented colours shown above.
Material mechanical values/resistance
Type
Material
NR IR SBR BR IIR EPDM NBR CR AU SI FSI FPM PUR PTFE
Tensile Strength 1 2 5 6 4 5 5 3 2 6 6 5 1 1
Elongation at Fracture 1 1 2 3 2 3 2 2 2 4 4 3 2 3
Rebond Resilience 2 2 3 1 6 3 3 3 3 3 3 5 2 NA
Wear Resistance 2 2 2 1 3 3 2 2 1 5 5 4 1 3
Tear Strength 2 3 3 5 4 4 4 3 4 6 6 3 1 2
Current Flow Resistance 1 1 2 2 2 2 4 3 3 1 1 4 2 1
Temperature Hot -Air Degrees C +90 +90 +100 +100 +140 +150 +130 +120 +120 +200 +200 +220 +80 +260
Minimum Temperature Degrees C -50 -40 -40 -60 -40 -40 -40 -30 -20 -80 -80 -25 -35 -190
Age Resistance 3 3 3 3 2 1 3 2 2 1 1 1 1 1
Ozone Resistance 4 4 4 3 2 1 3 2 2 1 1 1 1 1
Benzine Resistance 6 6 4 5 6 5 1 2 1 5 1 1 2 1
Oil and Grease Resistance 6 6 5 6 6 4 1 2 1 1 1 1 2 1
Acid Resistance 3 3 3 3 2 1 4 2 5 5 4 1 6 1
Alkali Resistance 3 3 3 3 2 2 3 2 5 5 4 1 6 1
Resistance to Hot Water 3 3 2 3 1 2 3 3 5 5 4 2 6 1
1 = Excellent 2 = Very Good 3 = Good 4 = Moderate 5 = Poor 6 = Insufficient
When choosing the material for your application,
the table above can be used to select the
material with the most appropriate properties.
For example, where an application has oil and
grease present, NBR, AU, SI, FSI FPM and PTFE
materials are suitable.
Contact our technical staff for more advice
on the suitability of the materials shown.