Difference Between Chlorobutyl Rubber Stopper and Bromobutyl Rubber Stopper

As a Rubber Stoppers with DMF Supplier, share with you.

At present, there are mainly two types of halogenated butyl rubber used in the production of rubber stoppers: chlorobutyl rubber and bromobutyl rubber.

Comparison of two rubbers:

Bromobutyl Rubber Stopper

1. Both chlorinated butyl rubber and bromobutyl rubber are modified products of butyl rubber, collectively referred to as halogenated butyl rubber. The purpose of modification is to improve its processing performance and expand the scope of application.

2. Stabilizer content: Because the bromine element in bromobutyl rubber is relatively active, the storage stability is low, and self-vulcanization is easy to occur, so it is necessary to add a stabilizer to the rubber (generally epoxy soybean oil, the content is 1.3 % By weight or so); and the chlorine element in chlorinated butyl rubber is more inert than bromine element and has high storage stability. Generally, no stabilizer is added, and the intrinsic purity is higher than that of brominated rubber.

3. Anti-aging agent content: the two rubbers are equivalent.

4. Performance: As an industrial product, there is no essential difference between the two.

5. Processing performance: Bromobutyl has high vulcanization activity and a wide range of options for vulcanization systems. General vulcanization systems can be used, and the vulcanization speed is accelerated. Industrial products usually require bromination due to higher physical performance requirements. Phenolic resin, stearic acid and zinc oxide are used as vulcanization system or thiazole and thiuram accelerators are used as vulcanization system. The early rubber stopper production also used the above system, but after use and later research, it was found that the above system affects the compatibility of the rubber stopper. At present, the domestic bromobutyl formulations are generally vulcanized with sulfur, which is highly efficient. low cost. However, the activity of chlorobutyl is relatively low, the choice of vulcanization system is slightly limited, and the production process technology is more demanding and difficult. In the early days, phenolic resin, stearic acid, and zinc oxide were commonly used as vulcanization systems. Their products have good heat resistance, but the extracts of their products generally develop color, which affects the clarity, so they are not used much now.

Comparison of two rubber stoppers:

1. Bromobutyl rubber stoppers are generally vulcanized with sulfur, which has poor heat resistance. Because bromine is more active, it is easy to produce a smell similar to rotten eggs (suspected as HBr or H2S gas) during high temperature sterilization. At the same time, the system needs to use a vulcanizing agent, which has a greater impact on the hemolysis test of the rubber stopper.

2. The chlorinated butyl rubber stopper generally adopts a non-sulfur vulcanization system, and the product has good heat resistance and low odor during high temperature sterilization; because the rubber does not contain epoxy soybean oil, it is not easy to cause wall hanging, opalescence, etc. after contacting the product phenomenon.

Our company also has Bromobutyl Rubber Stopper on sale, welcome to contact us.