PROMASEAL® Switchbox Intumescent protects fire-rated walls with recessed switchboxes by expanding under heat to seal gaps, stopping flames and smoke. Tested for up to 120 minutes of fire resistance, it preserves wall integrity and ensures reliable fire protection.

Visit link to find out more: https://www.promat.com/en-sg/construction/products-systems/products/fire-stopping/others/promaseal-switchbox-intumescent/