Mastic
Fire rated intumescent acrylic mastic is designed for sealing gaps around fire doors, for sealing joints, voids and irregular holes in fire rated structures, and for maintaining their integrity when sealing around pipes and cables that penetrate them. 
It can be used in most low movement joints up to 30mm wide with no slump and can be over-painted.

General benefits :

• Available in white or grey
• Suitable for sealing voids and service penetrations
• Can be used in joints up to 30mm
• Tested for up to 4 hours
• Lightweight and simple installation
• Maintenance free
• Excellent acoustic seal