As part of the FireFace solution for upgrading historic doors for fire resistance Sealmaster developed a very thin (1mm) self-adhesive graphite based intumescent strip which is fitted to the frame reveal avoiding the need for invasive routing of the door leaf edge or frame.
It is essential that the surface onto which the seal is to be fixed is clean and free from dust. Self-adhesive tapes will not adhere well to dirty or rough surfaces. The adhesion is best at temperatures between 15°C and 25°C but the product should not be applied if the temperature is below 10°C or above 35°C.
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