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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.

Category:

Gap Firestopping

Keyword:

Gap Firestopping

  • Product Description
  • Parameter
  • 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

  • VS Firestop Intumescent Sealing Compound Technical Data

    AppearanceComponent A: Dark gray-black; Component B: Reddish brown
    Packaging Specification4 kg/set (A + B)
    Main MaterialPolyurethane resin mixed with flame-retardant additives
    Cured Density300–400 kg/m³
    Foaming Expansion Ratio3–5×
    Mixing Time15–30 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 Rating3 hours
    Flame RetardancyV-0 (UL94, cured foam)
    Expansion Ratio (cured)≥400% (cured)

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