Fire Stop Sealant

LCI Fire Stop Sealant is a water-based intumescent sealant that expands up to 10 times its volume when exposed to heat, sealing gaps to block fire and smoke. Easy to apply on vertical and overhead surfaces, it’s ideal for through-penetration and joint firestopping in plumbing, HVAC & electrical systems.

Reference: https://www.cityfireservice.com/products/fire-stop-sealant/