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Seal it Right the First Time
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Duct Putty and Canned Foam Do Not Meet NEC Requirements.
Duct putty is intended to seal around junction boxes and flashing. When used in conduits, it sags over time, holds minimal water head pressure and compresses under the weight of large cables.
Canned foam is designed for cracks and crevices. It creates a lightweight, open-cell structure that allows water and moisture to pass through, much like a sponge. It will not completely cure in thick layers or enclosed spaces. Its seal is not airtight or watertight.
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FST is the Right Product for the Application
Stop Water Damage-Improve Electrical Reliability
FST™ Conduit Sealant meets and exceeds the NEC section requirements for sealing conduit systems. FST has been tested for cable compatibility; holds 22 feet of water head pressure continuously and up to 90 feet intermittently; prevents gas from passing through; does not sag; will not dry out; and is re-enterable. FST™ is chemically resistant to gasoline, oils, dilute acids and bases, and most unsaturated hydrocarbons.
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