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Compression set : ウィキペディア英語版 | Compression set
The compression set (ASTM D395) of a material is the permanent deformation remaining when a force (that was applied to it) is removed. The term is normally applied to soft materials such as elastomers. There are two ways this is normally measured; ''compression set'' ''A'' and ''compression set'' ''B''.〔Compression Set - ASTM D395 Plastic Test Standard, http://www.ides.com/property_descriptions/ASTMD395.asp, 15 June 2012〕 ==Compression Set A== This has the formal name Compression Set Under Constant Force in Air. In ''compression set A'' a force of 1.8 kN is applied to the specimen for a set time at a set temperature. ''Compression set A'' is defined as the percentage of original specimen thickness after the specimen has been left in normal conditions for 30 minutes (therefore CA, the ''compression set A'' is given by CA = (- ti) / to ) * 100 where to is the original specimen thickness and ti is the specimen thickness after testing).〔Compression Set - ASTM D395 Plastic Test Standard, http://www.ides.com/property_descriptions/ASTMD395.asp, 15 June 2012〕
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