All 3M™ Fire Barrier Caulks have either intumescent, endothermic or ablative technologies that provide a tight and dependable seal against fire, smoke, toxic fumes and moisture.
Additional Information
3M™ intumescent caulks expand up to three times their original size when exposed to temperatures over 300°F (149°C). This intumescent action forms a strong, insulating char which seals the opening for up to four hours when exposed to extreme heat. Fire barrier caulks are ideal for new construction or retrofit in a wide variety of applications such as metal, plastic, insulated and glass
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