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Intumescent Acrylic Mastic (White)

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A halon-free, acoustic intumescent mastic with good adhesion to all materials for fire stopping gaps up to 60mm.

Can be painted over for decorative purposes

Fits a standard mastic skeleton gun

Colour - White, Black or Grey

Size - 310ml Tube

Envirograf Product 58

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Product Info

Available in white, grey and brown. Supplied in 310ml tubes.

After application, a surface skin forms allowing painting, but stays permanently flexible. It is a low-pressure material with good cooling ability for metals, expands up to five times its size in a fire. The white or grey mastic will glow in the dark or in a smoke filled room. Ideal for use around exit door frames, and for filling small holes or cracks.

For use as a seal between door frames and walls, around edges of partitions, or in voids around services such as pipes- Can be used in conjunction with Envirograf Intumescent Slabs (Products 4 and 5), Blocks (Products 2 and 3) and Expansion Joints (Products 39 and 40) to provide a robust penetration seal


A minimum of 12mm depth is required around ceiling, floor and wall joints in computer

This prevents Halon gas escaping.
All surfaces should be sound and clean. Oily surfaces should be wiped with white spirit and then dried.
Dry, dusty brickwork must be moistened prior to application of Intumescent Mastic, using a normal skeleton gun.

Extrude the mastic firmly against the sides of the joint, ensuring firm contact.

Can be painted once a surface skin has formed.

Fire Performance

This product has been used in numerous fire resistance tests employing the general procedures

and criteria of BS476 Part 22 (1987). Integrity ratings of up to 249 minutes were achieved.

Also tested to European Standard EN1363-1 (2000), achieving 126 minutes.

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