various proportions. The characteristic thereof, due to the ingenious combination by the three components, shows such features as high impact resistance, large tensile strength and high rigidity which will not alter even under low temperature. Above all, the polymer possesses strong heat al and oil resistance, which endows it with such outstanding quali devoid of in ps and hips as resin is a butadiene free resin in abs resin it retains the transparency of styrene resin and is greatly improved in such properties as heat resistance, chemical resistance, oil resistance as well as mechanical intensity etc ABs resin boasts such quali th and mechanical intensity, sound emical resistance and heat resistance, stable dimension and easy processing etc and is relatively cheaper industrial material. It is mainly applied to the manufacturing of shells for radios and televisions, air conditioning and warming machines, juice machines, hair driers and shavers basal body of electric fans, vehicle meters, front protective grillages as well as air conditioning carrla AS resin can be used in such fields which require high mechanical intensity, chemical resistance and transparency such as battery compartments, meter boxes, blades of electric fans and beef oil case et 4. Acrylic Resins(PMMA) Acetone works together with prussic acid to form cyaniding propyl alcohol which is dehydrated with oil of vitriol, the substance is further combined into methacrylates through reaction with alcohol ester, and finally through polymerization with catalyzer, PMMA is thereby PMMA, like polystyrene(PS) he optimal transparency among all plas more difficult to be cut than polystyrene resin. It can be tabular polymethyl methacrylate and can be heated and bent into curved surface, the relative density thereof is also light. PMMA can be tinged into gallant colors and is extensively applied in building materials and furniture PMMA can be used to manufacture vehicle parts. Provided with sound lightfastness and ceilings. In addition, it embodies sound mechanical processing and bonding properties and can be applied in the manufacturing of delicate transparent models, optic lens, false teeth, contact lenses 5. Polyethylene(Pe) The commonest plastic that can be found in daily life is polyethylene(PE)which lymerized from ethylene industrially fractionated from petroleum Polyethylene of low density added with a small quantity of oxygen is heated to 200C under high pressure of approximately 2000 air pressure, white wax like polyethylene can thereby be obtained, and the method is called high pressure ethylene polymerization. With special organic metal catalyzer, the ethylene can be polymerized under normal temperature into polyethylene of high density, and such method is called low pressure ethylene polymerization. Polyethylene is generally a milk white, translucent or opaque substance which is lighter than water and can fall drop by drop like olefin when being burnt. It has sound water resistance, electric insulation, acid and alkali resistance. The substance can dissolve in hot toluene yet is quite stable against most chemicals and therefore it can be easily molded. The melt index indicates the fusion viscosity ofvarious proportions. The characteristic thereof, due to the ingenious combination by the three components, shows such features as high impact resistance, large tensile strength and high rigidity, which will not alter even under low temperature. Above all, the polymer possesses strong heat resistance as well as chemical and oil resistance, which endows it with such outstanding qualities devoid of in PS and HIPS. AS resin is a butadiene-free resin in ABS resin. It retains the transparency of styrene resin and is greatly improved in such properties as heat resistance, chemical resistance, oil resistance as well as mechanical intensity etc. ABS resin boasts such qualities as high impact strength and mechanical intensity, sound chemical resistance and heat resistance, stable dimension and easy processing etc and is a relatively cheaper industrial material. It is mainly applied to the manufacturing of shells for radios and televisions, air conditioning and warming machines, juice machines, hair driers and shavers, basal body of electric fans, vehicle meters, front protective grillages as well as air conditioning machines in the carriage etc. AS resin can be used in such fields which require high mechanical intensity, chemical resistance and transparency such as battery compartments, meter boxes, blades of electric fans and beef oil case etc. 4. Acrylic Resins (PMMA) Acetone works together with prussic acid to form cyaniding propyl alcohol which is dehydrated with oil of vitriol, the substance is further combined into methacrylates through reaction with alcohol ester, and finally through polymerization with catalyzer, PMMA is thereby got. PMMA, like polystyrene (PS), possesses the optimal transparency among all plastics and is more difficult to be cut than polystyrene resin. It can be tabular polymethyl methacrylate and can be heated and bent into curved surface; the relative density thereof is also light. PMMA can be tinged into gallant colors and is extensively applied in building materials and furniture. PMMA can be used to manufacture vehicle parts. Provided with sound lightfastness and transmittance, it is most suitable for making signboards, transparent covers and transparent ceilings. In addition, it embodies sound mechanical processing and bonding properties and can be applied in the manufacturing of delicate transparent models, optic lens, false teeth, contact lenses as well as machine parts. 5. Polyethylene (PE) The commonest plastic that can be found in daily life is polyethylene (PE) which is polymerized from ethylene industrially fractionated from petroleum. Polyethylene of low density added with a small quantity of oxygen is heated to 200℃ under a high pressure of approximately 2000 air pressure, white wax like polyethylene can thereby be obtained, and the method is called high pressure ethylene polymerization. With special organic metal catalyzer, the ethylene can be polymerized under normal temperature into polyethylene of high density, and such method is called low pressure ethylene polymerization. Polyethylene is generally a milk white, translucent or opaque substance which is lighter than water and can fall drop by drop like olefin when being burnt. It has sound water resistance, electric insulation, acid and alkali resistance. The substance can dissolve in hot toluene yet is quite stable against most chemicals and therefore it can be easily molded. The melt index indicates the fusion viscosity of