PIB 6H Polyisobutylene Rit-Chem Plasticizers >> Polyisobutylene (PIB) ADHESIVE >> Hot-melt SEALANT ADHESIVE >> Solvent based Polyisobutylene - Mid-range molecular weight hydrocarbon polymer for use in hot melt and solvent -based adhesive and sealant applications Polyisobutylene. Possesses mid-range molecular weight. Used in hot melt and solvent-based adhesive and sealant applications.