Flame Retardant Sealant

Intumescent sealants
These sealants expand significantly when exposed to high temperatures, forming a dense char to seal penetrations and block flames and smoke. They are commonly used around plastic conduits or pipes in fire-rated walls and floors. Intumescent sealants have different formulations (silicon, acrylic or polyurethane based) and are suitable for up to 4‑hour fire ratings.

Acrylic (non‑intumescent) firestop sealants
These sealants are mostly water-based and have low VOC content. These are typically paintable, and are a perfect solution for sealing small penetrations in dry indoor environments. These do not expand under heat and offer basic fire retardant capability. You will need to compliment them with a separate intumescent system for higher fire ratings.

Silicone firestop sealants
These are known for their high temperature resistance, excellent flexibility, and durability in exterior or high-moisture environments. Silicone sealants may not be intumesce, but they maintain sealing performance under heavy joint movement and wet conditions. Most silicon firestop sealants have W‑rating for water repellence.

Hybrid / Elastomeric sealants
These hybrid sealands combine silicone-like flexibility with strong adhesion typical of polyurethane. They offer enhanced performance where both movement and fire resistance are required. They are ideal for dynamic or mixed-substrate joints.

Cementitious / Mortar‑based firestop compounds
These are rigid sealants, such as firestop mortar, and are designed for large structural voids or through-penetrations where movement is minimal. They are commonly used in heavy-duty applications, like walls, ducts, or load-bearing openings.