Great Stuff™ Fireblock

GREAT STUFF™ Fireblock Insulating Foam Sealant is a ready-to-use, minimal-expansion insulating foam sealant that fills and insulates gaps up to 3/4 inch to restrict airflow. This distinctly orange solution seals electrical wiring run through wall studs as well as service penetrations in walls and between floors to provide a simple, cost-effective way to maintain the continuity of an approved fire block material throughout the house.

• Expands to fills, seals, and insulates gaps up to 3/4 inch
• Adheres to wood, metal, masonry, glass and most plastics
• Impedes spread of fire and smoke through service penetrations²
• Tested according to ASTM E84, ASTM E814 (modified), UL 1715
• Seals service penetrations between floors
• Seals electrical runs through wall studs
• Forms a long-lasting, airtight and water-resistant barrier
• Tack-free in 5-15 minutes³; trimmable in one hour
• Orange-colored foam for easy identification and inspection
• Cures rigid in 8 hours
• All-direction dispensing
• UL Classified

 ¹ Read all instructions and (Material) Safety Data Sheet ((M)SDS) carefully before use. 

² Intended for use in residential application to maintain the continuity of an approved fire block material. 

³ 70 ± 5°F and 50 ± 5 % RH, 1-inch bead diameter, 6-inch length. The cure rate is dependent on temperature, humidity, and size of the foam bead.