Plastic bottle caps made with polypropylene have a density of 0.92 grams per cubic centimeter, which is lighter than seawater's average density of 1.027 grams per cubic centimeter, and therefore, float in seawater.
Melting point: A thermoplastic, or thermosoftening plastic, is a plastic polymer material that becomes pliable or moldable at a certain elevated temperature and solidifies upon cooling. ... Thermoplastics differ from thermosetting polymers which form irreversible chemical bonds during the curing process.
No comments:
Post a Comment