Excellent cold/ ozone/ heat aging/ oil and solvent resistance CR Butterfly Valve Seat


Classification of rubber
There are many varieties of rubber, and the classification methods are not uniform.

1) According to the source of materials, it can be divided into two categories: Natural Rubber and Synthetic Rubber.

2) According to its performance and use, it can be divided into two categories: Universal Rubber and Specialty Rubber Eastomer.
* Any rubber with the same or close performance as natural rubber, good physical properties and processing properties, and can be widely used in tires and other general rubber products is called general rubber.
General rubber: natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (polybutadiene rubber, BR), isoprene rubber (polyisoprene rubber, IR)

* Any special rubber product with special properties, special for heat resistance, cold resistance, chemical corrosion resistance, oil resistance, solvent resistance, radiation resistance, etc. is called special rubber.
Special rubbers include: nitrile rubber (NBR), silicone rubber, fluoro rubber, urethane rubber, polysulfide rubber, polyacrylate rubber (UR), chloroether rubber, chlorinated polyethylene rubber (CPE), chlorosulfonated polyethylene (CSM), butadiene rubber, etc.

In fact, there is no strict boundary between general rubber and special rubber. For example, ethylene propylene rubber has the above two characteristics. Between general rubber and special rubber are: neoprene (CR), ethylene propylene rubber (EPDM), butyl rubber (IIR)

Gemeral information of Neoprene (CR)
1. Basic characteristics:
1.1 Raw material rubber has poor storage. Hardening occurs during storage. Cold resistance is not good.
1.2 Due to the crystallization, the raw rubber strength is higher, similar to natural rubber.
1.3 Excellent cold resistance, ozone resistance, heat aging resistance and oil and solvent resistance.
1.4 Good chemical resistance and excellent flame resistance.
1.5 has good adhesion.
1.6 Relative density is large, generally at 1.23. Under the same volume, the dosage is larger than that of general rubber.
1.7 Compared with other special rubbers, the individual performance is poor, but the overall performance balance is good.
1.8 Soluble in benzene, carbon tetrachloride and chlorobenzene.

2. Scope of application: Mainly used for oil resistant products, all kinds of hoses, tapes, especially heat-resistant conveyor belts, oil-resistant, acid-resistant hoses, sealing products, parts of automobile aircraft, adhesives and coatings, printing rubber rollers, rubber sheets , bridge support, etc., also used in a large number of cable sheathing, wire sheathing and so on.
3. Certificate: KTW W270 EN681-1,ACS,NSF61/372;WRAS,EC1935;FDA,EC1935;REACH,ROHS


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