3M Fire Barrier Sealant CP 25WB+

One-component, ready-to-use, gun-grade, latex-based intumescent firestop sealant

Up to 4 hours (ASTM E 814 / UL 1479, CAN/ULC-S115)

4°C to 50°C (40°F to 122°F)

0.59 MPa (85 psi)

12 months, unopened, stored above 20°C

19 L bucket | 610 ml

• Up to 4 hours of firestop protection: Tested for up to 4 hours (ASTM E 814 / UL 1479 and CAN/ULC-S115) in listed through-penetration systems — the highest through-penetration rating among the 3M sealants on this page.
• Intumescent: it grows when the fire arrives: Expands to at least three times its dried volume above 538°C, so the seal keeps closing as plastic pipes and cable jackets burn away.
• Fire, smoke and sound: Helps control the spread of fire, smoke and noxious gases, and carries an STC 54 acoustic rating.
• Clean, low-emission formula: Water-based, halogen-free and under 1 g/L VOC (less water and exempt solvents), so it suits occupied buildings and low-emission project requirements.
• Re-enterable and paintable: Services can be added or removed later and the seal repaired, and the surface can be painted.

• Mechanical, Electrical and Plumbing Penetrations: Sealing metallic pipe, plastic pipe (excluding CPVC), conduit, power and communication cable, cable trays, busways, insulated pipe and HVAC duct penetrations.
• Fire-Rated Floors and Walls: Penetrations through fire-rated floors, floor/ceilings and walls in commercial and industrial buildings.
• Static Construction Joints: Joint systems tested to ASTM E 1966 / UL 2079.
• Blank Openings: Firestopping blank openings left in fire-rated assemblies.

Step 1: Check the Listed System — Select the UL, Intertek or FM listed system for your wall or floor, penetrant and rating. It sets the sealant depth and backing material.

Step 2: Prepare the Surfaces — Clean the opening and penetrating items so they are dry and frost free, and install any backing material to the required depth.

Step 3: Apply — Install with a standard caulking gun or pneumatic pumping equipment, or work it in with a putty knife or trowel. Fill flush with the surface, or to the depth the listed system specifies.

Step 4: Tool Within 5 Minutes — Tool the sealant within five minutes and wash tools with water straight after use.

Step 5: Protect While It Dries — Tack-free in about 10 minutes, dry to touch in 30–60 minutes, about 3 mm (1/8 in) of depth per day. Keep rain and water spray off for 18 hours. Don't apply below 4°C.

Fire Barrier CP25WB+ Sealant TDS