① Most plastics are light, chemically stable and will not rust; ② Good impact resistance; ③ Good transparency and abrasion resistance; ④ Good insulation and low thermal conductivity; ⑤ Good general formability and coloring, and low processing cost; ⑥ Most plastics have poor heat resistance, high thermal expansion rate and are easy to burn; ⑦ Poor dimensional stability and easy deformation; 8 Most plastics have poor low temperature resistance and become brittle at low temperature; Pet-name ruby easy to aging; Attending some plastics are soluble in solvents.