they gradually give up (off-gas) volatile agents that act to keep them pliable. In other words, they get hard over time if anything. This can mean they become brittle (esp. outdoors, in UV) and crumble or powder.......
Assuming it is constantly exposed to moisture how long would this material be expected to last?
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Generally speaking, they gradually give up (off-gas) volatile agents that act to keep them pliable. In other words, they get hard over time if anything. This can mean they become brittle (esp. outdoors, in UV) and crumble or powder.
keywords: remain,Do,indefinitely,or,become,they,porous,hard,do,semi,modern,over,time,soft,plastics,Do modern semi-porous hard plastics become soft over time or do they remain hard indefinitely
