Engineering plastic Engineering plastics are plastics that can be used as structural materials. It has no obvious boundary with general-purpose plastics. Its main varieties are polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, thermoplastic polyester, thermoplastic polyurethane, polysulfone, polyarylsulfone (see polysulfone), polyphenylene. Sulfide and other aromatic heterocyclic polymers. Fluororesins, ultra high molecular weight polyethylene and all thermoplastic reinforced plastics, as well as other polymer blends and modified materials based thereon, have also been included.
Five engineering plastics
Polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, thermoplastic polyester.
Engineering plastic properties
1 density is small, generally 1/4 of steel, 1/9 to 1/5 of copper, 1/2 of aluminum. This has special significance for comprehensively reducing the weight of vehicles and aircraft.
2 The ratio of the tensile strength to the quality of the engineering plastics with high strength and glass fiber reinforced plastics is 1700-4000, while the steel is only about 1600.
3 good chemical stability, good corrosion resistance to acid, alkali and general organic solvents.
4 Excellent electrical insulation.
5 wear-resistant, self-lubricating, can reduce the friction coefficient.
6 high heat resistance and dimensional stability.
7 Excellent resistance to impact and fatigue. Common engineering plastics
Common engineering plastics 
Special engineering plastics
A Repair Kit or service kit is a set of items used to repair a device, commonly comprising both tools and spare parts. Many kits are designed for vehicles, such as cars, boats, airplanes, motorbikes, and bicycles, and may be kept with the vehicle in order to make on-the-spot repairs. Some are considered essential safety equipment, and may be included survival kits. In the military, personnel crossing large water bodies in aircraft may be equipped with a raft and raft repair kit. Other kits, such as those for watch repair or specific engine components, are used by professionals. Depending on the type, a repair kits may be included when buying a product, or may be purchased separately.
Repair Kit
Repair Kit,O Ring Seal Kits,O Ring Seal Box,Rubber O Ring Seal Kits
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