Polyisobutylene (PIB) is a homopolymer of isobutylene. Due to different preparation methods and process conditions, the molecular weight of polyisobutylene can vary in a certain range:

3. 3. Hygiene level is not good In general, materials with a molecular weight between 350 and 3500 are called low molecular weight polyisobutene, Products with a molecular weight between 10000 and 100000 are medium molecular weight products, and those with a molecular weight between 100000 and 10 million are high molecular weight products. Products with molecular weight less than 30000 are usually liquid, while materials with higher molecular weight are solid.

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