Plastic products
manufacturing
These are called Thermoplastic polymers because they keep their plastic properties.Some common thermoplastics are polyethylene, P.V.C., polyskyrene, polypropylene, nylon.26) These are called Thermosetting polymers Because once set into a shape, that shape cannot be altered. phenol Formaldehyde, ureaformal dehyde and melamine formaldehigde are important thermosetting plastics27) Polyvi ... See the full answer
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