Low water absorption, 97% closed cell content. Supports approximately 63 lbs/cubic foot. Has six months shelf life. A 2 lb/cubic foot density, rigid urethane foam system. Mix ratio by volume is 1:1. Mixed chemicals expand up to 30 times in volume and begin to set in approximately 2-3 minutes at 20 oC. USCG approved, petroleum resistant, excellent adhesion.