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Elastomer

Definition

Elastomer comes from the contraction of elastic polymer.

Elastomer refers to any material, such as but not limited too natural rubber or synthetic rubber, that is able to resume its original shape after removing a deforming force on it.

Elastomer may also be called rubber.

Comments

Elastomer is an amorphous polymer with a special molecular structure looking like mixed up spaghetti’s having in addition many cross links.

Under the pressure of a force, the cross links between the spaghetti’s will extend and will set the spaghetti’s back to their original position when the force is removed.

Depending on the nature of these cross links, elastomers may be able to accept reversible extension from 5 to 700%.

These cross links are rather sensitive to the temperature and will also depend on the type of elastomer.

Therefore Elastomer is a generic name which cover a large variety of rubbers that may find different applications precisely because of their different elasticity, temperature resistance or weathering and corrosion resistance such as acid, gas, fluids or sun rays.

Among the most common elastomers are the following:

 – Natural Rubber (NR) offering very good resilience and mechanical properties, but flammable and having poor resistance to oil, grease, fuel, heat, weathering and ozone

 – Styrene-Butadiene Rubber (SBR) aging longer and offering better abrasion resistance than NR

 – Butyl Rubber (BTR), also called Isobutyl Isoprene Rubber (IIR), gives better weathering, ozone, hot water and chemical resistance than NR with good electrical resistance, but no resistance to oil and grease and still flammable

 – Ethylene Propylene Diene Monomer Rubber (EPDM) supports excellent resistance to weathering, ozone, chemicals, hot water, steam, solvant, methanol with also excellent electrical insulation properties with fair resistance to aromatics

 – Nitrile Butadiene Rubber (NBR) resists to oil, fuel and accepts mechanical stress and high compression but also with poor resistance to aromatics and still flammable with production of toxic flue gases

 – Hydrogenated Nitril Rubber (HNBR) provides better performances than NBR, but with the same weaknesses and poor electrical properties

 – Chloroprene Rubber (CR) is aging very well in supporting well the heat, weathering and ozone, not flammable, but sensitive to low temperatures and fuel

Then there are some other elastomers with also their own resistance capabilities, such as Chlorsulfonated Polyethylene (CSM), Polyacrylate Rubber (ACM), Polyurethane Rubber (PU), Silicone Rubber (Q), Fluorosilicone Rubber (MFQ) and Fluoro Rubber (FPM). 

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