15WB prevents flames from passing through holes in surfaces.
Fire Barrier IC 15WB is a fire proofing sealing compound made by Minnesota Mining and Manufacturing. This 3M compound is made primarily of latex and can be placed into penetrations in walls, floors or ceilings to gradually fill in spaces as the items that penetrate the surface, such as a wire or PVC pipe, are destroyed by fire.
Available Packaging
3M Fire Barrier IC 15WB Sealant is available in four sizes. Cartridges to fit a caulking gun are made in both 10.1 and 27 fluid ounce sizes. In addition, 3M makes a a sausage shaped package that holds 20 fluid ounces. Finally, users who need large quantities of sealant can also buy a 4.5 gallon pail.
Physical Characteristics
Although water based, 15WB is actually a thick yellow paste which contains 80 percent solids and weighs 12 pounds per gallon. Although it can be applied by a caulk gun, trowel or other measures, when sprayed with a one quarter inch nozzle at a pressure of 50 pounds per square inch, it flows at a rate of 2000 grams per minute. Once applied, it will set to a point where it is no longer tacky in 8 to 12 minutes at a 73 degree room temperature.
Bondable Surfaces
This sealant bonds to just about every surface type used in construction. These include metal, concrete, wood, insulation jacketing, plastic and gypsum wall board.
Fire Resistance
Fire Barrier IC 15WB Sealant is intumescent, which means that it expands when exposed to fire. In fact, it is designed to expand at least double in size when exposed to a temperature of 1000 degrees Fahrenheit. Depending on circumstances, it can hold up under fire for up to two hours.
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