OSI QUAD Foam Gun or Straw is a single component, minimal expansion, low pressure polyurethane foam designed for Window and Door installations. It is packaged in a pressurized can, with a unique adaptor that allows both gun and straw application. Use with the straw is great for small jobs that require a single can and offers improved structure versus traditional straw foams. For larger jobs and heavy users, gun application is recommended, due to the ergonomic design of the gun, the ability to use the full can by re-sealing it for later use, and precision control to adjust the bead size. OSI QUAD Foam exhibits slight to moderate expansion during application and cures upon reaction with moisture to form a flexible, urethane foam. The closed cell structure of this material provides an R factor of 5 per inch of cured foam making it an efficient method for stopping air and moisture infiltration and expensive warm and cold air loss between windows and rough frame. It will not warp or deform windows and doors. OSI QUAD Foam Gun or Straw adheres to all types of building materials including wood, concrete, and drywall and is compatible with asphalt and butyl flexible flashing. It complies with all Federal and State VOC regulations