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Building firestopping and acoustic sealing that helps preserve compartmentation and reduce noise for penetrations and joints. FireShield Intumescent Acoustic Mastic gives installers confidence when sealing fire doors, window frames and service entries. Does it meet certification and movement requirements for modern construction projects?
⚡ At a Glance
- • Fire Performance: Tested to EN 1366-3 EI 120, EN 1366-4 EI 240 and BS 476 300 minutes
- • Best for: Sealing fire doors, window frames and service penetrations requiring both fire and acoustic control
- • Not ideal for: Visible decorative seals that require bespoke colour-matching or final paint finishes
CE marked and Certifire approved with UL-EU, UL-C and UL-US listings. Acoustic isolation tested to EN 10140 to 63dB with air permeability measured as 0.0/0.0 m3/h/m2 at 100Pa.
Reliable Fire Sealing – With an advanced intumescent formulation
Advanced intumescent chemistry has been tested to EN 1366-4:2006 AI:2010 and UL 2079, achieving fire resistance classifications to EN 1366-3 EI 120 and EN 1366-4 EI 240 as well as BS 476 300 minutes. Certification includes CE marking, Certifire approval and UL listings (UL-EU, UL-C, UL-US).
Helps maintain compartmentation under fire test conditions, supporting compliance on doors, frames and service penetrations.
Effective Noise Reduction – Thanks to an acoustic rating to EN 10140
Acoustic isolation has been validated to EN 10140 to 63dB, and air permeability testing to EN 1026 recorded 0.0/0.0 m3/h/m2 at 100Pa. The formulation combines density and adhesion properties tuned for sound attenuation at penetration points.
Reduces airborne noise transmission through joints and around services, improving privacy and occupant comfort.
Flexible, Durable Seals – With ±20% joint movement capability and resistant composition
Joint movement capability of +/- 20% is specified alongside mechanical adhesion and tensile testing to EN ISO 8039 and EN ISO 9046. The formulation is halogen free, water resistant and has been tested for fungal and vermin resistance.
Accommodates building movement without losing seal integrity and suits wet or demanding environments while remaining compatible with many service types.
✨ The 4 Key Reasons for FireShield Intumescent Acoustic Mastic
- Certifire & UL Listings – Support specification compliance across UK and international projects
- Tested with Pipes and Cables – Proven compatibility with metallic and plastic services in penetrations
- Mechanical Adhesion Testing – Ensures durable bonds under stress and movement conditions
- Contributes to Green Building – Halogen-free formulation and VOC checks support sustainable builds
(Exactly 4 points. Feature in bold, then en dash, then benefit. Benefit is concrete and measurable.)
📋 Technical Details at a Glance
- Category: BISS
- Certifications: CE Marked; Certifire approved; UL-EU, UL-C, UL-US Listed
- Fire resistance: EN 1366-3 EI 120; EN 1366-4 EI 240; BS 476 300 mins
- Fire tests: EN 1366-4:2006 AI:2010; UL 2079
- Acoustic rating: EN 10140 to 63dB
❓ Frequently Asked Questions
Q: Is the mastic certified for fire applications?
A: Yes, CE marked and Certifire approved with UL-EU, UL-C and UL-US listings; tested to EN 1366-3, EN 1366-4 and BS 476 standards.
Q: Can the mastic be used around pipes and cables, including plastic services?
A: Tested with metallic pipes, cables, cable bunches, cable trays and cable ladders, and causes no known adverse effects to plastic pipes, plastic cables or sheathing.
Q: How much movement can the seal accommodate and how durable is it?
A: Joint movement capability of +/- 20% with high flexibility and water resistance; mechanical adhesion and tensile testing carried out to EN ISO 8039 and EN ISO 9046.
🏆 Our Verdict
Suitable for installers, specifiers and building professionals who need certified firestopping and acoustic seals for doors, frames and service penetrations. The combination of international certifications, a verified acoustic rating and broad service compatibility makes the formulation especially useful on complex projects. While cost will depend on project scale, the long-term value comes from compliance, durability and reduced remedial work.
