... BASF B10 60000-70000 equal to BASF B12 3) Low MW medium polyisobutylene is a synthetic hydrocarbon formed by polymerization of isobutene ... have Low Molecular Weight ,such as 1000,1300,2300,2450 etc. which well usd in adhesives, plastic stretch film,lubricant, etc. Polyisobutylene (PIB ...