Engineering plastics become ever more important to present-day industry. Some high-density plastics have been developed to server as effective replacements for iron and metal parts in machinery. Due to their molecular density are capable of withstanding heavy impacts and constant wear.

Other advantages of engineering plastics are their resistance to chemical reactions and corrosions providing excellent, and their lower tendency to friction due to the lubricating substances they contain. Machinery consisting of such parts thus enjoys smoother operation and consumes less energy.

Engineering plastics are easily modified to replace defective machine parts more quickly reducing time losses on the production line and consequent problem associated with production delays.

The Siam Cast Nylon Co., Ltd. takes an important role in the growth of Thai industry, being the first manufacturer of engineering plastics including UHMW-PE 1000, Nylon 6, Ployacetal (POM), Delrin, and Cast Nylon (MC Nylon). Siam Cast Nylon Co., Ltd. is now the world's 6 th largest manufacturer of Cast Nylon.