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Henkel OSI Green Series. OSI Green Series FlameSeal Fire, Smoke & Draft Stop Sealant is the only Greenguard Children & Schools-certified sealant to control the spread of fire. This nonhazardous, one-part latex and vinyl acetate-based sealant has a VOC content of 33 g/L, is designed to service penetrations and joints in fire separations and firewalls, and controls fire, smoke, fumes, and water for up to four hours at temperatures up to 1,850 degrees Fahrenheit. The Henkel OSI Green Series line includes a number of low-VOC content and Greenguard Children & Schools-certified adhesives, caulks, and sealants. 800.624.7767. www.greenseries.com