High-performance elastomers
HNBR Hydrated nitrile butadiene rubber
Material | Synthetic elastomer, produced from NBR by catalytic hydration, peroxide cured. |
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Advantages | Outstanding physical properties, even at high temperatures, good low temperature behaviour. Low compression set, very good hot air resistance, very good ozone resistance. Good resistance to many chemically aggressive oils, low vapour and gas permeability. |
Disadvantages | Poor cold resistance. Combustible. |
AEM Ethylene acrylate rubber
Material | Polymer of ethylene methyl acrylate with carboxyl groups. Ethylene acrylate rubber is more heat resistant than ACM and FKM. |
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Advantages | Thermal application range approx. -40°C to +150°C, good compression set, post-curing can be forgone. |
Disadvantages | Swells strongly in ATF and transmission oils, brake fluid. |
ACM Polyacrylate elastomer
Material | Polyacrylate elastomers, or simply acrylate elastomers, are mixed polymers that are produced from various acrylic acid esters (with a slight addition of a monomer necessary for cross-linking) |
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Advantages | Good resistance to mineral oils with additives (motor, transmission, ATF oils) up to 150°C, high resistance to oxygen and ozone. Gas permeability low. |
Disadvantages | Low elasticity and unfavourable cold behaviour, high water absorption and poor hydrolysis resistance, unsuitable for electrical applications. Processing difficult (sticking, mould fouling). |
FPM Fluororubbe
Material | For example, Viton, Fluorel; vulcanisation without sulphur, post-curing necessary. |
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Advantages | Outstanding oil and chemical resistance, very high temperature resistance, very good ozone resistance, moderate mechanical strength. Tolerable swelling in aromatics. Does not burn with its own flame. |
Disadvantages | Relatively high-priced. Combustible. |