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Définition (286)
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cr
ASTM designation for Chloroprene Rubber (neoprene)
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epdm
ASTM abbreviation for a terpolymer of ethylene, propylene, and a diene with the residual unsaturated portion of the diene in the side chain.
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tga
Thermogravimetric Analysis. A test procedure used to determine the thermal stability or composition of a material. Two modes are possible; determining the change of weight of a specimen while changing temperature at a given rate of the change of weight of a specimen with time at a fixed temperature.
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abrasion resistance
The resistance of a material to loss of surface particles due to frictional forces.
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abrasion resistance index
A measure of the abrasion resistance of a vulcanized rubber part relative to that of a standard under the same conditions.
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accelerated aging
A method in which an attempt is made to produce and measure the effects of natural or in-use again in a short period of time. (Example, 72 hours at 100C (212F) in air test tube.)
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accelerator
A chemical used in small amounts to speed up curing or vulcanization of elastomeric compounds. (Example, tetramethyl thiuram monosulfide, 0.5 parts.)
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acrylate rubber
General term used to describe a class of elastomers based on acrylate esters. (Examples, Hycar 4021, 4051, 4054.) See ACM above.
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acrylic rubber
See Acrylate Rubber above, which is the preferred usage.
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acylonitrile
A chemical CH2CHCN, also known as vinyl cyanide, manufactured from propylene and copolymerized with butadiene to produce butadiene/acrylonitrile elastomers. (Examples, Hycar 1041,1032.)
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