Caulk Fire Stops | McMaster-Carr

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120° F

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-35° F

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9 Products

Fire-Stop Caulk

Caulk

Spray-On Caulk

Cartridge

Pail

Stick

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. It resists vibration, so it will flex with movement rather than crack or pull away from surfaces. Apply with a caulk gun or trowel.

Spray On—Spray-on caulk is used to evenly coat hard-to-reach openings. It’s often used to seal the spaces where fire-rated walls, floors, and ceilings meet.

Acrylic Plastic—Acrylic plastic caulk is water-based, which is the most common formula for fire-stop caulk. It’s a good choice for most applications.

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

Expandable—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.

Flammability Rating—This caulk is tested to ASTM and UL standards for stopping the spread of smoke and flames.

	Container
	Size	Type	Application Temp., ° F	Color	Fire Safety Rating	Flammability Rating	Specs. Met	Certification		Each
Caulk







				Acrylic Plastic

				10.3 fl. oz.	Cartridge	40 to 120	Red	4 hr.	ASTM E84 10/0 for Flame and Smoke, ASTM E119, ASTM E1966, UL 263, UL 723 10/0 for Flame and Smoke, UL 1479, UL 2079	ASTM E90, ASTM E814, ULC-S101, ULC-S102, ULC-S115	FM Approved	9339K33	000000


				30 fl. oz.	Cartridge	40 to 120	Red	4 hr.	ASTM E84 10/0 for Flame and Smoke, ASTM E119, ASTM E1966, UL 263, UL 723 10/0 for Flame and Smoke, UL 1479, UL 2079	ASTM E90, ASTM E814, ULC-S101, ULC-S102, ULC-S115	FM Approved	9339K34	00000




						Acrylic Plastic—Expandable

						10.3 fl. oz.	Cartridge	40 to 120	Red	4 hr.	ASTM E84 0/0 for Flame and Smoke, ASTM E119, ASTM E1966, UL 263, UL 723 0/0 for Flame and Smoke, UL 1479, UL 2079	ASTM E90, ASTM E814, ASTM G21, ULC-S101, ULC-S102, ULC-S115	FM Approved	93465K11	00000


						30 fl. oz.	Cartridge	40 to 120	Red	4 hr.	ASTM E84 0/0 for Flame and Smoke, ASTM E119, ASTM E1966, UL 263, UL 723 0/0 for Flame and Smoke, UL 1479, UL 2079	ASTM E90, ASTM E814, ASTM G21, ULC-S101, ULC-S102, ULC-S115	FM Approved	93465K12	00000
						5 gal.	Pail	40 to 120	Red	4 hr.	ASTM E84 0/0 for Flame and Smoke, ASTM E119, ASTM E1966, UL 263, UL 723 0/0 for Flame and Smoke, UL 1479, UL 2079	ASTM E90, ASTM E814, ASTM G21, ULC-S101, ULC-S102, ULC-S115	FM Approved	93465K14	000000




								Silicone Rubber—Watertight

								10.1 fl. oz.	Cartridge	-20 to 120	Gray	3 hr.	ASTM E84 3/22 for Flame and Smoke, ASTM E119, ASTM E1966, UL 263, UL 723 3/22 for Flame and Smoke, UL 1479, UL 2079	ASTM C920, ASTM E90, ASTM E814, ASTM E1399, ULC-S101, ULC-S102, ULC-S115	FM Approved	93455K51	00000


								20.2 fl. oz.	Stick	-20 to 120	Gray	3 hr.	ASTM E84 3/22 for Flame and Smoke, ASTM E119, ASTM E1966, UL 263, UL 723 3/22 for Flame and Smoke, UL 1479, UL 2079	ASTM C920, ASTM E90, ASTM E814, ASTM E1399, ULC-S101, ULC-S102, ULC-S115	FM Approved	93455K55	00000
								4.5 gal.	Pail	-35 to 140	Gray	4 hr.	ASTM E84 5/45 for Flame and Smoke, ASTM E119, ASTM E1966, UL 263, UL 723 5/45 for Flame and Smoke, UL 1479, UL 2079	ASTM C920, ASTM E90, ASTM E814, ASTM E1399, ASTM G21, ULC-S115	FM Approved	93455K48	000000


								Spray-On Caulk







												Acrylic Plastic

												5 gal.	Pail	40 to 120	Red	3 hr.	ASTM E84 0/0 for Flame and Smoke, ASTM E119, ASTM E1966, UL 263, UL 723 0/0 for Flame and Smoke, UL 1479, UL 2079	ASTM E90, ASTM E814, ASTM G21, ULC-S101, ULC-S102, ULC-S115	FM Approved	93455K56	000000