Kooltherm Pipe Insulation

Black-Silver pipes no Shadow

Premium performance pipe insulation

Kingspan Kooltherm premium performance pipe insulation is one of the thinnest and most efficient products available for the insulation of pipework in building services / HVAC applications. It is available in a range of thicknesses to suit different performance specifications and may be used on mild steel, stainless steel, carbon steel, copper and plastic pipework.


Product brochure

Our brochure includes technical data and thickness tables

Kooltherm Pipe Insulation Quick Guide

Product information

Recommended thickness
Technical data
Useful links
Thickness Comparison v2_crop

Thermal Performance

With a 25 year aged thermal conductivity as low as 0.025 W/m·K (at 10°C mean), Kooltherm Pipe Insulation is one of the most thermally efficient insulation material commonly used. A low thermal conductivity allows specified thermal performance standards to be achieved with thinner insulation.

The superior thermal performance of Kooltherm Pipe Insulation derives mainly from its closed cell properties. Its closed cell structure has been optimised to resist heat transfer. The closed cells have a small solid to void volume ratio, are small and uniform in size, and their construction very fine with extremely thin walls and minimum point contacts (struts). They are filled with a thermally efficient CFC/HCFC-free blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP). As a result of its closed cell, fibre free structure, Kooltherm Pipe Insulation is unaffected by air infiltration – problems that can be experienced with mineral fibre and which can reduce thermal performance.

Fire Performance

Kooltherm Pipe Insulation products and systems have a densely cross-linked structure that makes them difficult to ignite and when subjected to fire, the outer surface forms a strong carbonaceous layer that limits heat generation and retards further flame spread.

The excellent fire and smoke performance characteristics of Kooltherm Pipe Insulation products and systems clearly demonstrates their suitability for the designated application, with best in class European Reaction to Fire performance of BL,s1,d0. Please contact Kingspan Technical Services for details regarding FM Approval coverage. 

KoolthermFM_BRE A+_Logo

Kooltherm Pipe Insulation can directly contribute towards the award of several credits under the previous and current versions of BREEAM. The product holds a highest possible BRE Green Guide rating of A+ and is manufactured to a BS EN ISO 14001: 2004 scheme, qualifying for the Responsible Sourcing credit. In addition, Kingspan Industrial Insulation offers a ‘zero landfill, take-back’ scheme, using waste product collected from off-site manufacturers for recycling or energy recovery.

Kooltherm Pipe Insulation has a 90% (or greater) closed cell structure, which makes it non-wicking and highly resistant to moisture penetration. The risk of moisture absorption into the insulation is effectively eliminated as the factory-applied facing to Kooltherm Pipe Insulation products and systems provides a high performance vapour barrier jacket.
Click on the links below for the relevant recommended thickness tables. All of the tables can be found in the Kooltherm Quick Guide available under the Download section. 

Insulation Thickness Table to Control Heat Loss: BS 5422: 2009

Insulation Thickness Table to Control Heat Loss: ECA & Y50 Enhanced

Insulation Thickness Table to Control Heat Gain & Control Condensation

Insulation Thickness Table to Protect Against Freezing

General Physical Properties (Kooltherm Pipe Insulation System)
Property Test Method Unit Typical Value
Nominal Density (EN ISO 845) / (ASTM D 1622) kg/m3 37 60 80 120
Thermal Conductivity at +10°C (EN 12667) / (ASTM C 518) W/m.K 0.025 0.031 0.036 0.045
Colour     Pink Grey Grey Grey
Closed Cell Content (EN ISO 4590) Method 1 / (ASTM D 2856) Method B % ≥ 90 - - -
Operating Temperature:
Pipe Section

Upper Limit
Lower Limit




Minimum Compressive Strength at +23°C (EN 826) / (ASTM D 1621)





General Physical Properties (Vapour Barrier Jacket)
Property Test Method Unit Typical Value
Weight (EN ISO 536) g/m2 100 + / -30
Water Vapour Transmission (ASTM F 1249)
(ASTM E 96) 
g/m2.24 hr
Fire Test Classifications (Kooltherm Pipe Insulation)
Property Test Method Typical Result
Reaction to Fire EN 13501-1 BL – s1, d0
Surface Burning Characteristics ASTIM E 84 Class A/1 (FSI 25/SD 50)
Fire Propagation and flame spread   Class 0, in accordance with criteria set out in
Approved Documents B for England & Wales
FM Approval Class 4924 FM Approval per Approval Standard 4924
All of our pipe insulation installation videos can be viewed here

Kooltherm Pipe Insulation Quick Guide

Kooltherm Pipe Insulation Product Safety Information

Kooltherm Pipe Insulation Installation Guide

Kooltherm Pipe Insulation Specification Guide

Kooltherm Pipe Insulation Technical Data Sheets

Kooltherm Pipe Insulation HVAC DoP

Kooltherm Pipe 37kg-120kg DoP

Planet Passionate
Through our new Planet Passionate 10-year groupwide sustainability programme, we aim to make significant advances in the sustainability of our business and of our product

Case studies

Related products

Kingspan Technical Insulation

For queries relating to pipe insulation products.

Glossop Brook Road



SK13 8GP

General enquiries: 01457 890400

Technical advice: 0808 168 7363