Intumescent Acoustic Mastic White 310ml a one part intumescent acrylic mastic for sealing gaps around fire doors, window frames and for sealing joints, voids and irregular holes in fire rated structures. The sealant forms a char, preventing the passage of fire and smoke, when exposed to the heat of a fire.CE Certification for Mastic 

• Maintains fire integrity when sealing around pipes and cables that penetrate walls.
• Tested in Block Wall, Concrete, Masonry and Plasterboard Partition.
• Suitable for flexible walls, rigid walls & floors.
• Tested in Linear Joints up to 50mm wide.
• Tested in large service openings up to 490 x 150mm.
• Tested for sealing of linear joints in concrete floors, masonry walls and plasterboard including head of wall details.
• Tested around metallic pipes, cable trays, cable bunches, small, medium and large cables.