At present, there are hundreds of plastics produced in the industry, and there are more than 60 commonly used ones. The common classification methods are as follows:
According to performance after heating
Thermosetting plastic
This type of plastic is characterized by curing at a certain temperature after a certain period of heating or adding a curing agent.
The cured plastic has a hard texture and is insoluble in any solvent and cannot be softened again by heating. When the heating temperature is too high, it will decompose. Common thermosetting plastics are: bakelite, jade, decorative panels and unsaturated polyester plastics. Figure
2. Thermoplastics
This type of plastic is characterized by heat softening, cooling and hardening, and generally only physical changes during processing to maintain its chemical nature. The plastics of this type of plastic are mostly made of polyaddition. Common thermoplastics are: nitrocellulose plastics, acetate plastics, polyethylene plastics, polypropylene plastics, polystyrene plastics, polyvinyl chloride plastics, etc. For example, our common mineral water bottles, plastic bags, etc.
By application
General plastic
This type of plastic mainly refers to a class of plastics with large output, wide application and low price. They account for about 80% of total plastic production. The main varieties are: polyethylene, polyvinyl chloride, polypropylene, polystyrene, phenolic and amino plastics.
2. Engineering plastics
Generally refers to plastics that can be used as structural materials in engineering technology. The remarkable characteristics of this type of plastic are high mechanical strength, chemical resistance and high temperature resistance, which can replace metal or other special purposes. The main varieties are: polyamide, polycarbonate, polyoxymethylene, polysulfone, ABS, polyphenylene ether, fluoroplastics.
Divided by flammability
Flammable plastic
This type of plastic burns violently after an open flame and is not easy to extinguish. Such as nitrocellulose plastics, such plastics are classified as dangerous goods.
2. Flammable plastic
This type of plastic burns in an open flame and has no self-extinguishing properties, but it burns faster. Such as polyethylene, polypropylene and so on.
3. Flame retardant plastic
This type of plastic burns in a strong open flame and extinguishes quickly after the fire. Such as phenolic plastics, acetate plastics, polyvinyl chloride plastics, etc.
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