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Stone Shield Intumescent Mastic

 

Product Description

StoneShield Intumescent Mastic is a high-performance, fire-rated sealant designed to expand when exposed to heat, forming a robust, insulating char barrier that slows the spread of flame, smoke, and gases. It is ideal for sealing linear joints and around service penetrations in fire-rated walls and floors.

Key Features

  • Expands when exposed to fire
  • Maintains fire integrity of walls and floors
  • Flexible, paintable finish
  • Halogen-free and low VOC
  • Easy application via standard caulking gun
  • Adheres to concrete, gypsum, metal, plastics, and cables

Compliance & Standards

  • Tested to EN 1366-3 & EN 1366-4
  • CE Marked (ETA available)
  • RoHS & REACH Compliant
  • Classified to EN 13501-2: EI120 (when used as per system design)

Applications

  • Sealing service penetrations (pipes, cables, ducts)
  • Linear gap joints between walls/floors and partitions
  • Fire-rated plasterboard, masonry, and concrete systems
  • Use in compartmentation systems for passive fire protection

Technical Specification

Property Specification
Base Material Acrylic copolymer
Colour White / Grey
Density Approx. 1.55 g/cm³
Expansion Ratio Up to 4x original volume
Fire Rating Up to 4 hours (tested to EN 1366-4)
Movement Capability ±12.5% (ISO 11600)
Application Temperature +5°C to +40°C
Service Temperature -20°C to +70°C (ambient)
Curing Time (23°C, 50% RH) Skin forms: ~15 min; Fully cures: ~24 hr
Shelf Life 18 months (stored unopened, cool & dry)

Packaging Information

Format Details
Cartridge 310 ml (standard tube)
Foil Sausage 600 ml
Colour Options White / Grey
Box Quantity 12 cartridges / box
Pallet Quantity 1,200 cartridges

Installation Guidelines

  • 1. Ensure all surfaces are clean, dry, and free of dust, grease, or contaminants.
  • 2. Cut nozzle at desired bead size and insert cartridge into applicator gun.
  • 3. Apply evenly into the joint or around the service.
  • 4. Tool within 5–10 minutes to smooth surface and ensure full contact.
  • 5. Allow to cure. Protect from water and mechanical stress until dry.

Safety & Handling

  • Non-hazardous under normal use
  • Use in ventilated areas
  • Avoid contact with eyes or prolonged skin exposure
  • Refer to SDS for full safety details

Installation Guide

Certification

Data Sheet

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