Other plastics, such as acrylic, polyamides (nylon), polycarbonate and polylactic acid, designated with the #6 resin identification code (RIC). PMMA :- PMMA is also known as acrylic belongs to a group of materials called engineering plastics. It is a transparent thermoplastic.. This plastic is often used in sheet form as a lightweight or shatter-resistant alternative to glass and also be used as a casting resin, in inks and coatings, and for many other purposes. PC :- Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. PA :- polyamides (nylon) are considered as high performance plastics and are widely used in automotive & transportation markets, consumer goods and electrical and electronics applications among others.