1. According to the scope of application
1. General plastics: This type of plastic mainly refers to a type of plastic with a large production volume, a wide range of uses, and a low price. They account for about 80% of the total output value of plastics. The main types are: polyethylene, polyvinyl chloride, polypropylene, polystyrene, phenolic resin and amino plastic.
2. Rubber products: generally refers to plastics that can be used as construction materials in engineering design. The obvious characteristics of this kind of plastic are high impact toughness, resistance to solvent corrosion and strong heat resistance, which can replace metal materials or do other unique uses. The main types are: acrylic resin, polycarbonate, polyester chips, polysulfone, ABS, polyphenylene oxide, fluoroplastics, etc.
2. Division according to flammability
1. Combustible plastics: These plastics are strongly ignited after being exposed to fire and are not easy to extinguish. Such as nitrocellulose plastic, etc., this plastic is included in dangerous goods.
2. Flammable plastics: This kind of plastics are ignited by fire without self-extinguishing, but the ignition rate is rapid. Such as polyethylene, polypropylene, etc.
3. Flame-retardant plastic: This kind of plastic can be ignited in a very strong fire and extinguishes quickly after being separated from the fire. Such as phenolic plastic, cellulose acetate plastic, polyvinyl chloride plastic, etc.
3. According to the performance after heating
1. Thermosetting plastic: The characteristic of this kind of plastic is that it is cured at a certain temperature after a certain period of time or after adding an epoxy curing agent. The cured plastic has a hard color and does not dissolve any solvents, nor can it be softened again by heating. If the heating temperature is too high, it will dissolve. Common thermosetting plastics include: bakelite, electric jade, decorative panels and unsaturated fat polyester plastics.
2. Thermoplastics: The characteristics of these plastics are that they become soft when heated and harden when cooled. Generally, they can only be physically changed during the production process to maintain their organic chemical nature. Epoxy resins of this kind of plastics are more common. Common thermoplastics are: nitrocellulose plastics, acetate plastics, polyethylene plastics, polypropylene plastics, polystyrene plastics, polyvinyl chloride plastics, etc. For example, our popular beverage bottles, plastic bags, etc.