Because of the presence of double bonds in the main chain of NBR , its weather resistance, heat resistance, and chemical stability are poor, which limits its application range. 

Rubber processing involves multiple core procedures, each with significantly different operational objectives, processes, and safety risks. The following details the core content and safety points of each procedure in the order of the process flow:

Natural rubber refers to rubber obtained from plants. There are about 200 kinds of plants on Earth that can biosynthesize rubber, the main one being the Brazilian rubber tree, followed by silver chrysanthemum, rubber grass, eucommia, etc.

Butadiene rubber, short for cis -1,4- polybutadiene rubber, has the molecular formula (C4H6)n . It is a structurally regular synthetic rubber polymerized from butadiene, with a cis structure content exceeding 95% .

Chloroprene rubber is an elastomer made from chloroprene monomers through emulsion polymerization, coagulation, and drying. It was industrialized in 1931 , initially produced by DuPont in the United States. Global annual production is currently approximately 2 million tons.

Fluororubber refers to a group of elastomers whose molecular chains contain fluorine-containing side groups. There are 10 types, among which copolymers of vinylidene fluoride and perfluoropropylene, or with the addition of tetrafluoroethylene, are commonly used. In China, this type of rubber is called type 26 fluororubber, while DuPont calls it Viton -type fluororubber.

butadiene rubber (NBR) is a polymer formed by emulsion copolymerization of butadiene ( CH2=CH-CH=CH2 ) and acrylonitrile ( CH2=CH-CH-CN ), with an average molecular weight of around 700,000 . Rubber polymerized at 25 ℃ -50 ℃is called thermopolymerized NBR. NBR is renowned for its excellent oil resistance. Among existing rubbers, its oil resistance is second only to polysulfide rubber, acrylate rubber, and fluororubber, making it widely used in the Rubber Industry.

Butyl rubber, abbreviated as IIR , is an abbreviation for Isobutylene-Isoprene Rubber . It possesses excellent chemical and thermal stability, most notably its airtightness and watertightness. Its air permeability is only 1/7 that of natural rubber and 1/5 that of styrene-butadiene rubber , while its steam permeability is 1/200 that of natural rubber and 1/140 that of styrene-butadiene rubber. Therefore, it is mainly used in the manufacture of various inner tubes, steam pipes, water tires, dam bases, and gaskets, among other Rubber Products.

Styrene-butadiene rubber (SBR) is a copolymer of styrene and butadiene. SBR can be classified into two types according to its polymerization method: emulsion polymerization and solution polymerization. The synthesis technology of emulsion-polymerized SBR was successfully developed by IGFarben in Germany in 1933. Solution-polymerized SBR was put into industrial production in the 1960s . It is estimated that in 2024 , the global SBR production capacity was approximately 6.817 million tons, accounting for about 30% of the total synthetic rubber production .

Acrylic rubber ( ACM ) is copolymerized from acrylate monomers. Its main chain is a saturated carbon chain, and its side groups are polar ester groups. It has advantages such as simple processing equipment and ease of implementation.