K-FLEX Premium Range
K-FLEX Premium Pipe Insulation Range
K-FLEX is a world-leading manufacturer of technical pipe insulation for HVAC, refrigeration, plumbing, and industrial applications. Our premium range combines superior thermal performance, fire safety, and long-term durability to meet the demands of professional installers and specifiers.
From elastomeric closed-cell rubber to mineral wool and UV-protected solar insulation, K-FLEX offers a complete solution for every pipe insulation challenge.
Complete K-FLEX Product Range
K-FLEX ST Elastomeric Insulation
Premium closed-cell elastomeric tube for professional HVAC, refrigeration, and chilled water systems.
- Material: Nitrile rubber (NBR/PVC)
- Temperature Range: -40°C to +105°C
- Fire Rating: BL-s2,d0
- Thermal Conductivity: λ₄₀ = 0.036 W/m·K
- Water Vapour Resistance: μ ≥ 7,000
- Best For: Commercial HVAC, refrigeration, condensation control, custom installations
K-FLEX ST/SK Self-Seal Insulation
Factory-applied self-seal adhesive strip for faster installation with consistent seal quality.
- Material: Nitrile rubber with integrated adhesive closure
- Temperature Range: -40°C to +85°C
- Fire Rating: BL-s2,d0
- Installation Speed: Up to 50% faster than standard ST
- Best For: Fast-track projects, reduced labour costs, professional finish
K-FLEX PE Polyethylene Insulation
Cost-effective PE foam tube for domestic heating, plumbing, and standard commercial applications.
- Material: Closed-cell polyethylene foam
- Temperature Range: -40°C to +105°C
- Fire Rating: DL-s1,d0
- Thermal Conductivity: λ₄₀ = 0.036 W/m·K
- Best For: Domestic heating, plumbing, budget-conscious projects
K-FLEX PE PLUS Enhanced Insulation
Enhanced PE foam with improved fire rating for commercial HVAC and building regulations compliance.
- Material: Enhanced polyethylene foam
- Temperature Range: -40°C to +105°C
- Fire Rating: BL-s1,d0 (improved vs standard PE)
- Thermal Conductivity: λ₄₀ = 0.034 W/m·K
- Best For: Commercial HVAC, enhanced fire safety requirements
K-FLEX SOLAR HT UV-Protected Insulation
UV-resistant EPDM insulation for outdoor, solar thermal, and high-temperature applications.
- Material: UV-protected EPDM rubber
- Temperature Range: -40°C to +150°C
- Fire Rating: BL-s2,d0
- UV Resistance: Designed for outdoor exposure
- Best For: Solar thermal systems, outdoor pipework, high-temperature applications
K-FLEX K-Rock Mineral Wool Insulation
A1 non-combustible mineral wool for industrial, fire-rated, and high-temperature systems.
- Material: Mineral wool with aluminium foil facing
- Temperature Range: Up to +250°C
- Fire Rating: A1 (Non-combustible)
- Thermal Conductivity: λ₁₀ = 0.035 W/m·K
- Best For: Industrial steam, fire-rated compartments, high-temperature process pipework
Product Selection Guide
By Application
| Application | Recommended Product | Why? |
|---|---|---|
| Domestic Heating & Plumbing | K-FLEX PE | Cost-effective, easy to install, suitable for standard temperatures |
| Commercial HVAC | K-FLEX ST or PE PLUS | Superior moisture resistance, enhanced fire rating, professional performance |
| Refrigeration & Chilled Water | K-FLEX ST | Excellent vapour resistance (μ ≥ 7,000), prevents condensation |
| Fast-Track Projects | K-FLEX ST/SK | Self-seal strip reduces installation time by up to 50% |
| Solar Thermal & Outdoor | K-FLEX SOLAR HT | UV-protected, high-temperature rated, weather-resistant |
| Industrial Steam & Fire-Rated | K-FLEX K-Rock | A1 non-combustible, up to +250°C, Building Regs compliant |
By Temperature Range
| Pipe Temperature | Recommended Product |
|---|---|
| -40°C to +85°C | K-FLEX PE, PE PLUS, ST, ST/SK |
| +85°C to +105°C | K-FLEX ST, PE, PE PLUS |
| +105°C to +150°C | K-FLEX SOLAR HT |
| +150°C to +250°C | K-FLEX K-Rock Mineral Wool |
By Fire Rating
| Fire Classification | Product | Typical Use |
|---|---|---|
| A1 (Non-combustible) | K-FLEX K-Rock | Fire-rated compartments, escape routes, industrial |
| BL-s1,d0 | K-FLEX PE PLUS | Commercial HVAC, enhanced fire safety |
| BL-s2,d0 | K-FLEX ST, ST/SK, SOLAR HT | Commercial buildings, refrigeration, HVAC |
| DL-s1,d0 | K-FLEX PE | Domestic heating, plumbing, standard applications |
Why Choose K-FLEX?
✓ Proven Performance
Over 40 years of innovation in technical insulation. Trusted by professional installers, specifiers, and engineers worldwide.
✓ Complete Range
From domestic plumbing to industrial steam systems, K-FLEX offers a solution for every application and budget.
✓ Quality Certified
All K-FLEX products are CE marked, tested to EN standards, and manufactured to ISO 9001 quality management systems.
✓ Technical Support
Expert technical team available to assist with product selection, specification, installation guidance, and compliance.
✓ UK Stock & Fast Delivery
Comprehensive stock holding in the UK ensures fast delivery and reliable supply for your projects.
Technical Resources
Product Data & Installation Guides
Access comprehensive technical data sheets, installation guides, and compliance certificates for all K-FLEX products.
Product Comparison
Compare thermal performance, fire ratings, temperature ranges, and applications across the K-FLEX range.
View Product Comparison Guide →
Knowledge Centre
FAQs, installation tips, troubleshooting, and expert guidance on pipe insulation specification and best practices.
Frequently Asked Questions
Which K-FLEX product should I choose?
It depends on your application. Use our selection guide above, or contact our technical team for personalized recommendations based on pipe temperature, environment, fire rating requirements, and budget.
Are K-FLEX products suitable for potable water?
Yes, all K-FLEX elastomeric and PE products comply with potable water standards and are safe for drinking water systems.
What's the difference between ST and ST/SK?
ST is standard pre-slit tube requiring adhesive sealing. ST/SK includes a factory-applied self-seal adhesive strip for faster installation (up to 50% time saving) with consistent seal quality.
Can I use K-FLEX outdoors?
Use K-FLEX SOLAR HT for outdoor applications - it's UV-protected and weather-resistant. Standard ST and PE products are designed for indoor use.
Do you offer custom sizes or special orders?
Yes, we can arrange special orders for non-standard sizes, wall thicknesses, or large project quantities. Contact our sales team for details.
Where can I find installation instructions?
Detailed installation guides are available on our Technical Resources page, or contact our technical team for project-specific guidance.
Get Expert Advice
Not sure which product is right for your project? Our technical team can help with:
- Product selection and specification
- Thermal calculations and insulation thickness recommendations
- Fire safety and Building Regulations compliance
- Installation guidance and troubleshooting
- Project quotations and bulk pricing
Contact us today for expert support.