3M Fire Barrier Sealant IC 15WB+

• Intumescent seal up to 3 hours: Firestop tested for through-penetration applications for up to 3 hours (ASTM E 814 / UL 1479 and CAN/ULC S115), expanding on heating to keep openings sealed.
• Fire, smoke and sound: Seals against fire, smoke and noxious gases, with an STC rating of up to 54 in an STC 54 rated wall.
• Listed as CPVC compatible: 3M lists IC 15WB+ as CPVC compatible, which suits plumbing and sprinkler pipework (still check the CPVC manufacturer's list).
• Easy to apply and clean: Water-based, sag-resistant, with an excellent caulk rate and water clean-up. It can be painted once dry.
• Re-enterable: Can be repaired if services change, forming a monolithic seal when dry.

• Pipe and Cable Penetrations: Through-penetration firestop systems for pipes, cables, cable trays, insulated pipe, busways and HVAC ducts.
• Plastic and CPVC Pipework: Penetrations by plastic pipe, where intumescent action closes the opening as the pipe burns away.
• Static Construction Joints: Joint systems tested to ASTM E 1966 / UL 2079.
• Acoustic Sealing: Sealing gaps in partitions where sound transfer must be limited.

Step 1: Check the Listed System — Pick the listed UL, Intertek or FM system that matches your wall or floor, penetrant and rating; it sets the sealant depth and backing.

Step 2: Prepare the Opening — Clean surfaces so they are dry and frost free, and install the backing material (such as mineral wool) to the depth the system calls for.

Step 3: Apply — Gun the sealant into the opening using conventional caulking equipment, filling to the depth specified.

Step 4: Tool and Clean Up — Tool the surface smooth and clean tools with water straight away.

Step 5: Let It Dry — Allow it to dry before painting. Keep rain and water spray off while it dries and don't apply to wet or frost-coated surfaces.

3M Fire Barrier Sealant IC 15WB+