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Knauf Rock Fibre Pipe Insulation

Knauf Rock Fibre Pipe Insulation is a high‑performance mineral wool solution for thermal, acoustic and fire‑safe pipework.

Euroclass A2‑s1,d0Service Temp up to 500°C0.035 W/m·K λ at 40°CFire Resistance up to EI 120Acoustic & Thermal Performance

Knauf Mineral Fibre Insulation Product Range

20mm Wall Thick Knauf

20mm Wall Thickness Foil Faced Knauf Rock Fibre Pipe Insulation

25mm Wall Thick Knauf

25mm Wall Thickness Foil Faced Knauf Rock Fibre Pipe Insulation

30mm Wall Thick Knauf

30mm Wall Thickness Foil Faced Knauf Rock Fibre Pipe Insulation

40mm Wall Thick Knauf

40mm Wall Thickness Foil Faced Knauf Rock Fibre Pipe Insulation

50mm Wall Thick Knauf

50mm Wall Thickness Foil Faced Knauf Rock Fibre Pipe Insulation

Knauf Ductwrap Insulation

Knauf Thermo-tek RL Alu Foil Faced Glass Wool Ductwrap

Knauf Ductslab Insulation

Knauf Thermo-tek BD Alu Foil Faced Rock Fibre Ductslab

Insulation Accessories

Accessories for use with Knauf Insulation

For a full range of pipe insulation lagging we have available,

see our Pipe Lagging & Pipe Insulation category.


Performance Benefits


  • High maximum service temperature up to 500 °C

Suitable for LTHW, district heating and high‑temperature building services where polymer‑based insulation materials are not appropriate.

  • Euroclass A2‑s1,d0 / A2L‑s1,d0 non‑combustible rating

Provides excellent fire performance for risers, plant rooms and service voids, supporting compliance with EN 13501‑1.

  • Certified fire resistance up to EI 120 for service penetrations

Thermo‑teK PS Pro ALU is tested to EN 1366‑3 / EN 13501‑2 for fire‑rated penetrations — a level of certification not commonly available across mineral wool pipe sections.

  • Consistent thermal performance for heating‑led HVAC systems

Thermal conductivity from from 0.033 W/mK (10 °C) ensures stable performance across typical heating temperatures.

  • Dimensional stability under heat and load

Rock mineral wool construction (100–120 kg/m³ density) maintains shape and performance even under elevated temperatures and mechanical stress.


Practical & Installation Benefits


  • Cost‑effective mineral wool solution

Ideal for price‑sensitive commercial and residential heating projects without compromising essential performance.

  • Easy to cut, shape and install

Installer‑friendly material that adapts well on site and supports fast, consistent installation.

  • Pre‑formed pipe sections for uniform results

Provides a neat, professional finish along pipe insulation runs and reduces installation time compared to wrap‑around methods.

  • Durable foil‑faced finish

Robust aluminium facing offers a clean appearance and helps protect the insulation in plant rooms and service areas.

  • Suitable for a wide range of heating applications

Well‑suited to LTHW, distribution mains, risers, plant rooms and general building services pipework.

Specification

PropertyValue
MaterialCircular‑wound rock mineral wool pipe section with ECOSE® Technology binder
FacingFibreglass‑reinforced, tear‑resistant aluminium foil acting as a vapour barrier and self‑adhesive closure
Thermal Conductivity0.033 W/m·K at 10°C; 0.037 W/m·K at 40°C; 0.039 W/m·K at 50°C; 0.046 W/m·K at 100°C (EN ISO 8497)
Service TemperatureCore: up to +250°C; Facing: up to +80°C (EN 14707)
Fire PerformanceEuroclass A2L‑s1,d0 (≤300 mm OD) / A2‑s1,d0 (>300 mm OD) to EN 13501‑1; EI120 capable in wall/ceiling penetrations
Section Length1,200 mm standard length with longitudinal slit for easier installation
Available Thicknesses20–120 mm depending on diameter and application
Internal Diameter Range15–324 mm (pre‑formed to suit pipe OD)
DensityApprox. 100–120 kg/m³ (EN 13470)
Water Vapour Resistancesd ≥ 200 m (EN 13469) — high vapour barrier performance
Water Absorption≤ 1 kg/m² (EN 13472)
Melting Point of Fibres≥ 1000°C (DIN 4102‑17)
Designation CodeMW‑EN14303‑T8‑ST(+)500‑WS1‑MV2‑CL10 (OD <150 mm) / MW‑EN14303‑T9‑ST(+)500‑WS1‑MV2‑CL10 (OD ≥150 mm)
CertificationsEurofins Indoor Air Comfort Gold; RAL; M1; Manufactured under ISO 9001, 14001, 45001, 50001 systems

Frequently Asked Questions

What is Knauf Thermo-teK Rock Fibre Pipe Insulation?+

Knauf Thermo-teK pipe sections are non-combustible rock mineral wool insulation products designed for HVAC and heating-led building services. They provide reliable thermal performance, high fire resistance and a durable foil-faced finish suitable for commercial and light industrial applications.

What fire rating does Knauf Thermo-teK PS Pro ALU achieve?+

Thermo-teK PS Pro ALU is classified Euroclass A2-s1,d0 (or A2L-s1,d0 depending on pipe diameter) to EN 13501-1, meaning it is non-combustible with very limited smoke production. It is also tested for fire resistance up to EI 120 for service penetrations in accordance with EN 1366-3 / EN 13501-2.

What is the maximum service temperature of Knauf rock fibre pipe sections?+

Knauf Thermo-teK PS Pro ALU has a maximum service temperature of up to 500 °C for the mineral wool core, making it suitable for LTHW, district heating and high-temperature building services where polymer-based insulation materials are not appropriate.

Is Knauf rock fibre suitable for chilled or AC pipework?+

No. As an open-fibre mineral wool product, Thermo-teK PS Pro ALU is not recommended for chilled water or AC systems where a continuous vapour barrier is required. It is best suited to heating-led HVAC applications, plant rooms, risers and general building services.

What sizes and insulation thicknesses are available?+

Knauf Thermo-teK pipe sections are available in a wide range of bore sizes and insulation thicknesses, typically from 20 mm to 50 mm wall thickness. Full size and thickness availability is listed on each product page.

Can Knauf rock fibre pipe insulation be used externally?+

Yes — but it must be protected with suitable weatherproof jacketing such as aluminium cladding, PIB sheeting or external-grade metal casings. The foil facing alone is not designed for outdoor exposure.
🛡️ View jacketing options

Is Knauf rock fibre easy to cut and install?+

Yes. Rock mineral wool is installer-friendly and can be cut using standard insulation tools. Pre-formed pipe sections help achieve a neat, consistent finish along pipe runs.

Does the foil facing act as a vapour barrier?+

The aluminium foil facing provides a durable protective layer and can support vapour control when correctly sealed, but it is not intended for chilled or cold-water applications where a continuous vapour barrier is essential.

Page last updated April 2026