3M™ Fire Barrier Water Tight Sealant 1003 SL – Gray, 10.1 fl oz Cartridge

Protect critical floor penetrations and horizontal fire-rated assemblies with 3M™ Fire Barrier Water Tight Sealant 1003 SL. Engineered for superior fire, water, and smoke protection, this premium self-leveling silicone sealant provides a durable, flexible barrier that helps maintain the integrity of fire-rated construction while simplifying installation for professional contractors.

Its self-leveling formula flows smoothly into horizontal openings, eliminating the need for tooling and creating a clean, consistent seal. Designed with a neutral-cure, single-component silicone formulation, it offers excellent adhesion, minimal odor, outstanding weather resistance, and long-lasting flexibility. The sealant also accommodates ±31% joint movement, making it ideal for both dynamic and static construction joints.

Tested to meet stringent ASTM and UL firestop standards, 3M™ Fire Barrier Water Tight Sealant 1003 SL provides up to 3 hours of fire protection while also meeting UL Water Leakage Test (W Rating – Class 1) requirements. It helps prevent the spread of fire, smoke, toxic gases, and moisture, making it an ideal solution for commercial, industrial, and institutional construction projects where performance and code compliance are essential.

Key Benefits

• Up to 3-hour fire protection in tested firestop systems
• Meets UL Water Leakage Test (W Rating – Class 1)
• Self-leveling formula eliminates the need for tooling
• Neutral-cure silicone provides excellent adhesion with very low odor
• Accommodates ±31% joint movement
• Helps block fire, smoke, toxic gases, and water intrusion
• Excellent weather resistance for long-term durability
• Re-enterable and repairable for future modifications
• Paintable with primer
• Reduces airborne sound transmission (STC Rating up to 56)

Recommended Applications

• Horizontal floor penetrations
• Dynamic and static construction joints
• Perimeter fire barrier systems
• Curtain wall joints
• Blank openings
• Mechanical, electrical, and plumbing (MEP) penetrations
• Commercial and industrial firestop installations