168mm Pipe Insulation

168mm pipe insulation fits steel pipe with a 168mm outside diameter — equivalent to 6 inch nominal bore steel pipe (168.3mm OD), used for large commercial and industrial heating mains, chilled water distribution, district heating primary mains and major process pipework. We stock a full range of 168mm pipe insulation from the UK's leading manufacturers including Armaflex, K-Flex, Rockwool and Kingspan Kooltherm, in wall thicknesses from 25mm to 60mm.

Types of 168mm Pipe Insulation

Armaflex EVO 168mm — Class O closed-cell nitrile rubber foam with built-in vapour barrier. Available in 25mm wall. The professional's choice for chilled water and HVAC at this pipe size
K-Flex ST 168mm — Class O elastomeric foam equivalent to Armaflex. Available in 25mm wall
Rockwool Rocklap 168mm — A1 non-combustible mineral wool with foil facing for high-temperature applications up to 250°C. Available in 25mm, 40mm, 50mm and 60mm wall. The primary choice for steam and high-temperature heating at this pipe size
Kingspan Kooltherm 168mm — Premium phenolic foam (λ = 0.025 W/mK) for space-constrained plant rooms, risers and district heating applications

Which Wall Thickness Do I Need?

25mm wall — Standard for commercial HVAC, chilled water and heating mains. Meets Part L and CIBSE Guide C for most commercial applications at this pipe size
30–40mm wall — Enhanced performance for district heating, exposed pipework and high-performance specifications (Kooltherm)
50–60mm wall — High-temperature heating mains, steam and industrial process pipework (Rockwool)

168mm Pipe Insulation — Common Applications

Large commercial and industrial heating mains (6 inch steel pipework)
District heating and heat network primary flow and return mains
Chilled water mains in large commercial HVAC, data centre and industrial installations
Steam distribution and high-temperature process pipework
Power station and energy centre pipework

How to Measure Pipe Insulation

Pipe insulation is sized by the outside diameter (OD) of the pipe. For steel pipe, 168mm refers to 168.3mm OD (6 inch nominal bore). Always measure the outside of the pipe before ordering.