Polypropylene sheets are available in three general types of PP that includes
homopolymer, random copolymer and block copolymer. The comonomer used is
typically ethylene. Ethylene-propylene rubber or EPDM added to PP
homopolymer increases its low temperature impact strength. Randomly
polymerized ethylene monomer added to PP homopolymer decreases the
polymer crystallinity and makes the polymer more transparent.
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