Intumescent Mastic

Tested to BS476: Part 20 & EN 1366-4. Up to 4 hours fire resistance. Easy to use. Long shelf life. Acoustic insulation.

For internal/external use. NHBC Type Approval. Certifire Approval.

A one part fire rated intumescent acrylic mastic designed for sealing gaps around fire doors, window frames and for sealing joints, voids and irregular holes in first structures, and for maintaining their integrity when sealing around pipes and cables that penetrate them.

The mastic has been independently tested in accordance with BS476: Part 20 and 22: 1987 and EN1366-4 and can provide up to 4 hours fire resistance depending on depth/width and volumetric area.

Can be used on most construction substances, although we do recommend that a small area is tested on unusual substrates. It can be used in most low movement joints up to 25mm wide with no slump and can be overpainted.