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Based on morphology, it is divided into block rubber, latex, liquid rubber, and powder rubber. Latex is a colloidal aqueous dispersion of rubber; liquid rubber is an oligomer of rubber, generally a viscous liquid before vulcanization; powder rubber is latex processed into powder form for easy mixing and processing.Thermoplastic rubber, developed in the 1960s, does not require chemical vulcanization but is shaped using the processing methods of thermoplastic plastics. Rubber is also divided into general-purpose and special types according to its use. It is an insulator and does not easily conduct electricity, but if it gets wet or at different temperatures, it may become a conductor. Conductivity is about the ease of electron conduction of molecules or ions inside a substance. According to the source and method of raw materials: rubber can be divided into two major categories: natural rubber and synthetic rubber. Among them, the consumption of natural rubber accounts for 1/3, and the consumption of synthetic rubber accounts for 2/3.
According to the appearance morphology of rubber: rubber can be divided into four categories: solid rubber (also known as dry rubber), latex rubber (referred to as latex), liquid rubber, and powder rubber.
According to the properties and uses of rubber: in addition to natural rubber, synthetic rubber can be divided into general-purpose synthetic rubber, semi-general-purpose synthetic rubber, special-purpose synthetic rubber, and special synthetic rubber.
According to the physical form of rubber: rubber can be divided into hard rubber and soft rubber, raw rubber and mixed rubber, etc.
According to performance and use: general-purpose rubber and special rubber.

Natural Rubber:
Natural rubber mainly comes from the Hevea brasiliensis tree. When the bark of this rubber tree is cut open, a milky white sap called latex will flow out. After coagulation, washing, molding, and drying, natural rubber is obtained. Synthetic rubber is obtained by artificial synthesis methods. Different raw materials (monomers) can be used to synthesize different types of rubber. From 1900 to 1910, chemist C.D. Harris determined that the structure of natural rubber is a polymer of isoprene, which paved the way for the artificial synthesis of rubber. In 1910, Russian chemist SV Lebedev (1874-1934) used metallic sodium as an initiator to polymerize 1,3-butadiene into sodium butadiene rubber. Later, many new types of synthetic rubber appeared, such as cis-polybutadiene rubber, chloroprene rubber, styrene-butadiene rubber, etc. The output of synthetic rubber has far exceeded that of natural rubber, with the largest output being styrene-butadiene rubber.

General-purpose Rubber:
Refers to rubber types that partially or completely replace natural rubber, such as styrene-butadiene rubber, cis-polybutadiene rubber, and isoprene rubber, mainly used in the manufacture of tires and general industrial rubber products. The demand for general-purpose rubber is large, and it is the main type of synthetic rubber.

Styrene-butadiene Rubber:
Styrene-butadiene rubber is obtained by copolymerization of butadiene and styrene. It is the largest-produced general-purpose synthetic rubber and includes emulsion styrene-butadiene rubber, solution styrene-butadiene rubber, and thermoplastic rubber (SBR).

Nitrile Rubber:
Nitrile rubber is a polymer obtained by emulsion copolymerization of butadiene and acrylonitrile. Nitrile rubber is known for its excellent oil resistance, second only to polysulfide rubber, acrylate rubber, and fluororubber. In addition, nitrile rubber also has good wear resistance, aging resistance, and airtightness, but its ozone resistance, electrical insulation, and cold resistance are relatively poor, while its conductivity is relatively good. Therefore, it is widely used in the rubber industry. Nitrile rubber is mainly used in oil-resistant products, such as various sealing products. Others include its use as a PVC modifier and in combination with PVC for flame-retardant products, with phenol formaldehyde for structural adhesives, and for rubber products with good anti-static properties.

Silicone Rubber:
Silicone rubber has a main chain formed by silicon and oxygen atoms, and the side chain is a carbon-containing group. The largest amount used is silicone rubber with ethylene as the side chain. It is both heat-resistant and cold-resistant, with a usable temperature range of 100-300℃. It has excellent weather resistance and ozone resistance, as well as good insulation properties. The disadvantages are low strength, poor tear resistance, and poor wear resistance. Silicone rubber is mainly used in aerospace, electrical, food, and medical industries.

Cis-polybutadiene Rubber:
It is obtained by solution polymerization of butadiene. Cis-polybutadiene rubber has particularly excellent cold resistance, wear resistance, and elasticity, as well as good aging resistance. Most cis-polybutadiene rubber is used in tire production, and a small part is used to manufacture cold-resistant products, buffer materials, tapes, rubber shoes, etc. The disadvantages of cis-polybutadiene rubber are poor tear resistance and poor skid resistance.

Isoprene Rubber:
Isoprene rubber is the abbreviation of polyisoprene rubber, produced by solution polymerization. Like natural rubber, isoprene rubber has good elasticity and wear resistance, excellent heat resistance, and good chemical stability. The strength of raw isoprene rubber (before processing) is significantly lower than that of natural rubber, but its uniformity and processing properties are superior to natural rubber. Isoprene rubber can replace natural rubber in the manufacture of heavy-duty tires and off-road tires, and can also be used to produce various rubber products.

Ethylene-propylene Rubber:
Ethylene-propylene rubber is synthesized using ethylene and propylene as the main raw materials. It has outstanding aging resistance, electrical insulation properties, and ozone resistance. Ethylene-propylene rubber can be filled with a large amount of oil and carbon black, and the product price is relatively low. Ethylene-propylene rubber has good chemical stability, and its wear resistance, elasticity, and oil resistance are close to styrene-butadiene rubber. Ethylene-propylene rubber has a wide range of uses, and can be used as tire sidewalls, rubber strips, and inner tubes, as well as automotive parts. It can also be used as wire and cable sheathing and high-voltage, ultra-high-voltage insulation materials. It can also be used to manufacture rubber shoes, sanitary products, and other light-colored products.

Chloroprene Rubber:
It is mainly made from chloroprene through homopolymerization or copolymerization with a small amount of other monomers. It has high tensile strength, excellent heat resistance, light resistance, and aging resistance, and its oil resistance is superior to natural rubber, styrene-butadiene rubber, and polybutadiene rubber. It has strong flame resistance and excellent anti-extinguishing properties, high chemical stability, and good water resistance. The disadvantages of chloroprene rubber are its poor electrical insulation performance and poor cold resistance, and the raw rubber is unstable during storage. Chloroprene rubber has a wide range of uses, such as in the manufacture of conveyor belts and transmission belts, sheathing materials for wires and cables, oil-resistant hoses and gaskets, and chemical-resistant equipment linings.