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What is Rubber – Rubber is an e|astomer—that is, a long-chain polymer which is capable of cross linking which is referred to as vulcanization. The vulcanization process cross-links the polymer chains via chemical bonds creating the elastic or “rubbery or memory properties”, which gives it the ability to regain its original
shape after being deformed. Rubber is also tough and resistant to weathering and chemical attack. Elastomers can be naturally occurring polymers, such as natural rubber, or they can be synthetically produced substances, such as butyl rubber, Thiokol, or neoprene which are required to as synthetic rubber. For a substance to be a useful elastomer it must possess a high molecular weight and a flexible polymer chain.Elastomers (Rubbers) are typically descried by type or family based on the base polymer used in theformulation. These classifications are summarized per the ASTM D 1418 standard.

ELASTOMER RUBBER COMPOUNDS TYPES AND REFERENCES
General Description Chemical Descriptio Abbreviation (ASTM 1418) ISO/DIN 1629 Other Trade names & Abbreviation ASTM D2000 Designations
Nitrile Acrylonitrile-butadienne rubber NBR NBR Buna-N BF, BG, BK, CH
Hydrogenated Nitrile Hydrogenated Acrylonitrile-butadience rubber HNBR (HNBR) HNBR DH
Ethylene-Propylene Ethylene propylene diene rubber EPDM EPDM EP, EPT, EPR BA, CA, DA
Fluorocarbon Fluorocarbon Rubber FKM FPM Viton®, Fluorel® HK
Chloroprene Chloroprene rubber CR CR Neoprene BC, BE
Hypalon Chloro-sulfonated Polyethylene CSM CSM Hypalon CSM
Silicone Silicone rubber VMQ VMQ PVMQ FC, FE,GE
Fluorosilicone Fluorosilicone rubber FVMQ FVMQ FVMQ FK
Polyacrylate Polyacrylate rubber ACM ACM ACM EH
Ethylene Acrylic Ethylene Acrylic rubber AEM AEM Vamac® EE, EF, EG, EA
Styrene-butadiene Styrene-butadiene rubber SBR SBR SBR AA, BA
Butyl Isobutylene Polymer IIR IIR IIR IIR
Polyuthane Polyester urethane/Polyether urethane AU / EU AU / EU AU / EU BG
Natural rubber Natural rubber NR NR NR AA
GENERAL PROPERTIES OF ELASTOMER CLASSES & RUBBER COMPOUNDS
Very Good = 1 Good = 2 Average = 3 Poor = 4 temperature in C
Basic Property NBR HNBR EPDM FKM CR CSM ACM BIIR SBR AU/EU VMQ FVMQ NR
Nitrile Viton Neo. Hyp Butyl P.U. Si. Fl.Si
Economy of Material 1 3 2 4 2 3 3 3 1 3 3 4 1
Compression Set Resistance 1 1 2 1 2 2 4 3 2 3 2 2 1
Resilience (Rebound) 2 2 2 2 2 2 3 3 2 2 2 2 1
Tear Strength 2 1 2 2 2 2 3 3 3 2 4 3 1
Heat Aging Resistance 3 2 2 1 3 2 1 2 3 1 1 1 3
Ozone Resistance 4 2 1 1 2 1 2 2 3 1 1 1 3
Resistance to Oil & Grease 2 2 4 1 3 3 1 4 4 2 2 1 4
Fuel Resistance 2 2 4 1 4 3 1 4 4 3 4 2 4
Water Swell Resistance 2 2 1 2 2 3 4 1 1 4 1 1 1
Gas Impermeability 3 2 2 2 2 2 3 1 3 2 4 4 3
Dynamic Service / Abrasion Res. 2 2 3 3 2 1 2 3 1 1 4 4 1
High Temperature – Standard 100 150 150 200 120 150 150 100 100 80 220 200 105
High Temperature – Special 120 250
Low Temperature – Standard -30 -30 -40 -20 -30 -35 -40 -40 -30 -50 -60 -60 -30
Low Temperature – Special -50 -40 -35
Due to the number of interesting process, it is STRONGLY RECOMMENDED THAT YOUR ELASTOMER SELECTION BE RIGOROUSLY TESTED IN THE ACTUAL APPLICATION, performance assumptions must be checked so that you are certain that all variables have been carefuully considered.
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