High performance acrylic based construction sealant for sealing joints and cracks in fire rated internal walls and floors. In the event of fire Firestem Fire Resistant Sealant provides a barrier to flame and smoke preventing the spread of the fire and toxic gases through building joints. upto 4 hour fire rating on brick, concrete and steel.
Water based and easy to apply. Firestem Fire Resistant Sealant forms a flexible seal with good adhesion to most common building materials.
When subjected to heat Firestem Fire Resistant Sealant swells and chars to provide an inert barrier to smoke and flame. The fire resistance achievable with Firestem Fire Resistant Sealant depends upon the joint design, depth of sealant and substrates being sealed.
All surfaces to be sealed must be clean, dry and free from grease, laitence or dust.
When applying, ensure all crevices are filled and there is complete contact between sealant and substrate. Tool down using a wetted spatula. Any excess may be removed using soapy water before mastic dries.
Note: Depth of seal must not exceed width.
The formula for calculating the linear metres per cartridge is as follows:
310 ÷ gap width (mm) x gap depth (mm)
Store in cool dry conditions. Use within 12 months.
Firestem Fire Resistant Sealant is tested by Warrington Exova to EN1366-3, EN1366-4 and BS476 part 20.
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