Hand-mold this putty into small openings in fire-resistant walls and floors. Often used to seal the area around PVC pipes or cables, it expands when heated to fill the gaps left if your equipment melts. It’s tested to ASTM and UL standards to stop the spread of smoke and flames.

Putty pads are often used to seal the area around electrical boxes. Mold them onto the sides of the box before installing it in a wall or floor.

Easy to apply and quick to set, this caulk is a popular choice for sealing small openings in fire-resistant walls and floors. It’s often used to line seams or fill gaps around cables or pipes that run between rooms. You can use it alone or with other fire-stop products. This caulk is tested to ASTM and UL standards for stopping the spread of smoke and flames. It resists vibration, so it will flex with movement rather than crack or pull away from surfaces. Apply with a caulk gun or trowel.

Acrylic caulk is water-based, which is the most common formula for fire-stop caulk. It’s a good choice for most applications. Expandable caulk is used to seal the area around PVC pipes, cables, and other equipment that can melt or shrink during a fire. When it’s heated, it expands to fill gaps.

Silicone caulk forms a watertight, flexible seal. Use it to seal openings that are exposed to weather, washdowns, or standing water.