Protect Your Doors with Professional-Grade Fire Safety
The Intumescent for Radius and Square Flush Bolts is a premium fire protection solution designed for 150mm and 200mm flush bolts. Engineered for timber and composite doors, it ensures passive fire protection around flush bolt installations, preventing heat, flames, and smoke from spreading through gaps during fire incidents. By incorporating this high-quality intumescent pad, installers, contractors, and property owners can maintain fire-rated door performance while enhancing safety, compliance, and long-term reliability.
Flush bolts, whether radius or square, create small cavities in doors that, if left unprotected, can compromise fire-door certification. The Intumescent for Radius and Square Flush Bolts expands rapidly under high temperatures, sealing these gaps and safeguarding the structural integrity of the door assembly. Its self-adhesive design ensures quick and precise placement, saving time during installation while providing durable, long-lasting protection.
Key Features
- 🔒 Compatible Sizes: Works with 150mm and 200mm radius or square flush bolts.
- 🛡️ Fire Protection: Expands under heat to seal gaps and prevent fire and smoke penetration.
- 🪵 Door Compatibility: Suitable for timber and composite fire-rated doors.
- ✨ Self-Adhesive Design: Ensures fast, precise, and secure installation.
- ⚡ Durable Performance: Resistant to moisture, aging, and wear over time.
- 🛠️ Professional-Grade: Trusted by contractors, fire-door installers, and property developers.
- ✅ Passive Fire Safety: Remains dormant until needed, requiring no electricity or maintenance.
Technical Specifications Table
| Specification | Details |
|---|---|
| Product Name | Intumescent for Radius and Square Flush Bolts |
| Compatible Flush Bolts | 150mm and 200mm Radius/Square |
| Material Type | High-reactive Intumescent Pad |
| Door Types | Timber & Composite Fire-Rated Doors |
| Installation | Self-Adhesive Placement |
| Fire Protection | Passive Fire Resistance |
| Dimensions | Custom-fit to flush bolt cavity |
| Durability | Resistant to aging, moisture, shrinkage |
| Compliance | Fire-rated hardware standard |
| Usage | Residential, commercial, institutional doors |
Benefits of the Intumescent for Radius and Square Flush Bolts
- Enhanced Fire Safety: Prevents the spread of heat, smoke, and flames through flush bolt cavities.
- Durable Protection: Maintains its integrity over years, avoiding cracking, flaking, or hardening.
- Ease of Installation: Self-adhesive and easy to trim for precise fit, ideal for professional workflows.
- Compliance Assurance: Supports BS-certified fire-door systems and passive fire protection standards.
- Invisible Safety: Installed internally, it does not affect the aesthetic appeal of doors or hardware.
Applications & Usage
- Fire-rated timber doors in residential and commercial properties.
- Composite doors in office buildings, hotels, hospitals, and schools.
- Retrofit or new construction projects requiring radius or square flush bolts.
- Multi-bolt doors where consistent passive fire protection is needed.
- Building safety upgrades to maintain certification compliance and improve occupant safety.
Why Choose Intumescent for Radius and Square Flush Bolts
Choosing the Intumescent for Radius and Square Flush Bolts demonstrates a commitment to safety, compliance, and professional installation quality. Its precision-fit design ensures maximum fire-door performance without compromising the operation of flush bolts. Contractors, locksmiths, and fire-door specialists trust this pad because it provides a reliable, passive fire barrier, easy installation, and long-term durability.
By installing this pad, you are protecting lives, property, and investment while ensuring that fire-rated doors perform exactly as intended under emergency conditions. Its heat-expanding properties make it a critical component in any certified fire-door assembly, providing an invisible yet highly effective layer of protection.
FAQ – Intumescent for Radius and Square Flush Bolts
Q1: Does it fit both radius and square flush bolts?
Yes, it is specifically designed to fit 150mm and 200mm radius and square flush bolts.
Q2: Can it be used on timber and composite doors?
Absolutely, it is compatible with both door types in fire-rated applications.
Q3: Is installation difficult?
No, its self-adhesive backing allows for easy placement and trimming for a perfect fit.
Q4: How does it perform under heat?
The pad expands rapidly to seal gaps, preventing the spread of smoke, heat, and flames.
Q5: Is it suitable for retrofit applications?
Yes, ideal for both new installations and upgrading existing fire doors.
Trust & Certification Messaging
The Intumescent for Radius and Square Flush Bolts is manufactured under strict quality standards, ensuring fire-rated performance, reliability, and long-term durability. Trusted by fire-door installers, contractors, and building managers, it provides passive fire protection in compliance with fire-door regulations. Its premium-grade materials guarantee that your doors remain safe, compliant, and functional, protecting occupants and property from fire hazards.

































Thomas (verified owner) –
Impressive product quality and quick delivery. The items were easy to use and very reliable. Great value for the money.
George (verified owner) –
Very well worth the money.
Oscar (verified owner) –
Great ironmongery company.
Harry (verified owner) –
Good quality, good price, work well, couldn’t ask for better. Highly recommended for anyone looking for a reliable and affordable product.
George (verified owner) –
I always use these for my jobs and I can’t fault them. Highly recommend
Ava (verified owner) –
Very good quality and easy to fix. Highly recommend them
Oliver (verified owner) –
Needed new door these are perfect for job.
Thomas (verified owner) –
Impressive product quality and quick delivery. The items were easy to use and very reliable. Great value for the money.
Lily (verified owner) –
Excellent quality, very fast delivery. Deffinatly would recommend
Olivia (verified owner) –
Great product very sturdy well worth the money and not expensive.