Firestop Intumescent Sealing Compound VM-S
Firestop Intumescent Sealing Compound VM-S is a two-component, reactive polyurethane-based fire-resistant sealing foam. When exposed to fire, it rapidly expands to form an insulating char layer, effectively blocking heat and flame propagation. During application, the A and B components are mixed in a specified ratio and injected into the targeted openings, gaps, or grooves. With excellent flowability, it can penetrate narrow or irregular spaces, ensuring comprehensive firestop sealing.
Gap Firestopping
Gap Firestopping
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Product Features
Reactive intumescent sealant with superior adhesion
Liquid formulation allows self-leveling and gap filling
Rapid expansion upon heat exposure to block thermal transfer
Once cured, forms lightweight, weather-resistant, fire-rated polyurethane foam
Product Applications
Firewalls in power cable trenches
Firestop sealing for wall gaps and openings in buildings
Penetration sealing in electrical equipment enclosures
Sealing both ends of cable conduits and sleeves
Test Standard
Chinese National Standard GB23864
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VS Firestop Intumescent Sealing Compound Technical Data
Appearance Component A: Dark gray-black; Component B: Reddish brown Packaging Specification 4 kg/set (A + B) Main Material Polyurethane resin mixed with flame-retardant additives Cured Density 300–400 kg/m³ Foaming Expansion Ratio 3–5× Mixing Time 15–30 seconds (high-speed stirring) Working Time ≤10 minutes (at 25 °C material and ambient temperature) Tack-Free Time ≤60 minutes (at 25 °C) Full Curing Time ≥24 hours (at 25 °C) Fire Resistance Rating 3 hours Flame Retardancy V-0 (UL94, cured foam) Expansion Ratio (cured) ≥400% (cured)
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