Mineral Wool Insulation
Mineral Wool Pipe Insulation | K-FLEX K-Rock Foiled
Mineral wool insulation is a non-combustible, high-temperature insulation solution for industrial pipework, fire-rated systems, and applications requiring A1 fire classification. K-FLEX K-Rock foiled mineral wool combines superior fire safety with excellent thermal performance.
Why Choose Mineral Wool Insulation?
A1 Non-Combustible Fire Rating
K-FLEX K-Rock achieves Euroclass A1 - the highest fire safety classification. Completely non-combustible, making it essential for fire-rated compartments, escape routes, and high-risk industrial environments.
High Temperature Performance
Suitable for continuous service temperatures up to +250°C, far exceeding the capabilities of elastomeric or PE foam insulation. Ideal for steam lines, hot water systems, and industrial process pipework.
Excellent Thermal Efficiency
Low thermal conductivity (λ₁₀ = 0.035 W/m·K) provides effective insulation for both hot and cold applications, reducing energy loss and maintaining system efficiency.
Aluminium Foil Facing
Factory-applied aluminium foil facing provides a vapour barrier, weather protection, and professional finish. Simplifies installation and ensures long-term performance.
Durable & Long-Lasting
Resistant to moisture, rot, and vermin. Maintains thermal and fire performance throughout the building's lifetime without degradation.
K-FLEX K-Rock Product Range
K-FLEX K-Rock ALU Foiled Insulation
Aluminium foil-faced mineral wool pipe sections for industrial and commercial high-temperature applications.
- Temperature Range: Up to +250°C continuous
- Fire Rating: A1 (Non-combustible)
- Density: ~100 kg/m³
- Facing: Aluminium foil vapour barrier
- Supply Format: 1m lengths, pre-formed pipe sections
- Best For: Industrial steam, hot water, fire-rated systems, high-temperature process pipework
Available Sizes
K-FLEX K-Rock is available in a range of bore sizes and wall thicknesses to suit various pipe diameters and insulation requirements. Contact our technical team for specific sizing and availability.
Applications
Industrial Steam & Hot Water Systems
Ideal for steam distribution, condensate return lines, and high-temperature hot water systems in industrial facilities, district heating, and commercial buildings.
Fire-Rated Compartments
Essential for pipework passing through fire-rated walls, floors, and ceilings. A1 classification ensures compliance with Building Regulations Part B and fire safety standards.
Plant Rooms & Boiler Houses
Suitable for high-temperature environments where elastomeric or PE foam insulation cannot be used. Provides fire safety and thermal efficiency in mechanical plant rooms.
Process Pipework
Chemical plants, refineries, food processing, and manufacturing facilities requiring non-combustible insulation for process heating and cooling systems.
External & Exposed Pipework
Aluminium foil facing provides weather protection for outdoor installations. Suitable for exposed pipework on building exteriors and rooftops.
Technical Specifications
Thermal Performance
| Temperature | λ [W/m·K] |
|---|---|
| +10°C | 0.035 |
| +50°C | 0.038 |
| +100°C | 0.042 |
| +150°C | 0.048 |
Key Properties
- Fire Performance: Euroclass A1 (EN 13501-1) - Non-combustible
- Maximum Service Temperature: +250°C continuous
- Density: ~100 kg/m³
- Water Vapour Resistance: Provided by aluminium foil facing
- Standards: EN 14303, CE marked
- Facing: Aluminium foil vapour barrier
Installation Guide
K-FLEX K-Rock Installation
- Measure & Cut: Cut sections to required length (supplied in 1m lengths)
- Position: Place mineral wool sections around the pipe, ensuring foil facing is outward
- Secure: Use wire, banding, or clips to secure sections in place
- Seal Joints: Overlap foil facing at longitudinal seams and butt joints
- Tape Seams: Seal all joints with aluminium foil tape to maintain vapour barrier integrity
- Support: Provide adequate support for vertical runs and heavy sections
Installation Tips
- Ensure foil facing is continuous and undamaged to maintain vapour barrier
- Use aluminium foil tape (not standard duct tape) for all seams and joints
- Support long horizontal runs every 1-2 metres to prevent sagging
- For outdoor installations, consider additional weather cladding for extended lifespan
- Wear appropriate PPE (gloves, dust mask) when handling mineral wool
Mineral Wool vs Other Insulation Types
| Property | Mineral Wool (K-Rock) | Elastomeric (ST/SK) | PE Foam |
|---|---|---|---|
| Fire Rating | A1 (Non-combustible) | BL-s2,d0 | DL-s1,d0 to BL-s1,d0 |
| Max Temperature | +250°C | +105°C | +105°C |
| Flexibility | Rigid (pre-formed sections) | Flexible | Flexible |
| Moisture Resistance | Requires foil facing | Excellent (closed-cell) | Good (closed-cell) |
| Best For | High-temp, fire-rated, industrial | HVAC, refrigeration, chilled water | Domestic heating, plumbing |
Explore alternatives: Elastomeric Insulation for HVAC & refrigeration | K-FLEX PE for domestic applications
Frequently Asked Questions
When should I use mineral wool instead of elastomeric insulation?
Use mineral wool when: (1) pipe temperature exceeds +105°C, (2) A1 non-combustible fire rating is required, (3) pipework passes through fire-rated compartments, or (4) building regulations mandate non-combustible insulation.
Can K-FLEX K-Rock be used for cold pipework?
Yes, but elastomeric insulation (K-FLEX ST) is generally preferred for chilled water and refrigeration due to superior moisture resistance and easier installation.
How do I seal joints in mineral wool insulation?
Overlap the aluminium foil facing at all joints and seal with aluminium foil tape. This maintains the vapour barrier and prevents moisture ingress.
Is mineral wool insulation safe to handle?
Yes, when handled correctly. Wear gloves and a dust mask during installation. K-FLEX K-Rock is manufactured to modern safety standards and does not contain asbestos.
Can K-Rock be used outdoors?
Yes, the aluminium foil facing provides weather protection. For extended outdoor exposure, consider additional protective cladding or jacketing.
What wall thickness do I need for steam pipes?
Depends on pipe temperature and heat loss requirements. Typical guidance: 40-50mm for low-pressure steam, 50-80mm for high-pressure steam. Consult our technical team for specific recommendations.
Building Regulations & Fire Safety
Part B Fire Safety Compliance
K-FLEX K-Rock's A1 non-combustible classification ensures compliance with Building Regulations Part B (England & Wales), Section 3 (Scotland), and Part E (Northern Ireland) for fire safety in buildings.
Fire-Rated Penetrations
When pipework passes through fire-rated walls or floors, mineral wool insulation is often required to maintain the fire rating of the compartment. K-Rock provides the necessary non-combustible protection.
Escape Routes & High-Risk Areas
A1-rated insulation is essential in escape routes, stairwells, corridors, and high-occupancy buildings where fire safety is critical.
Related Resources
- Technical Data Sheets & Installation Guides
- Product Comparison Guide
- Knowledge Centre & FAQs
- Shop K-FLEX K-Rock Range
- Elastomeric Insulation (for lower temperatures)
Need help with fire-rated insulation specification? Contact our technical team for expert guidance on compliance, sizing, and installation.