Gregory T. Hanson | Gordon & Rees LLP | February 17, 2016 Polyisobutylene, or PIB, is a synthetic rubber commonly used as an edge sealant in Insulating Glass Units (IGU’s). IGU’s consist of multiple glass panes within a window frame (e.g. “double-glazed” and/or “triple-glazed” windows), and serve the purpose of insulating building interiors from both sound… Continue reading PIB. And It’s Increased Movement Into Window Defect Claims