(3) of unsaturated polyesterWill add a gravel, pigment and other preparation pour liquid polyester mold, polymerization and curing at room temperature by a certain time, get all sorts of beautiful artificial marble products.(4) cellulose nitrate and cellulose acetateTo a certain concentration of polymer solution, at a certain speed and flow injection delay on gratuitous metal belt, removing solvent by heat curing, and then made by stripping film from the carrier, also known as solvent casting.Industrial production mainly used the method on photography and film with film (see support body).(5) polyamidePoured the molten caprolactam monomer in the injection mould, make its complete under the effect of catalyst polymerization, cooling the products.It is especially suitable for the production of large parts such as gears, bearings, fuel tanks, parts strength, high rigidity.Other materials can be used for casting molding and polyethylene, polyurethane, polyvinyl alcohol, silicon resin, thermoplastic rubber, etc. therefore, silicon is a beneficial element in steel.