Insulating Glass Hot Melt Butyl Sealant is a single-component, solvent-free, low-density sealant based on polyisobutylene, designed for use as the primary sealant in insulating glass units. It is suitable for curtain wall insulating glass and insulating glass. Due to its excellent UV resistance, good air tightness, and extremely low water vapor permeability, it works in conjunction with other elastic sealants (such as polysulfide or silicone) as a secondary sealant to form a superior barrier against water vapor and inert gas exchange, ensuring the longevity of the insulating glass.