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PIR (Polyisocyanurate)

Polyisocyanurate is also referred to as PIR, polyiso, or ISO.

It is a thermoset plastic which is commonly produced as a foam and used as a rigid form of thermal insulation. Its chemical composition is similar to polyurethane.


PIR has a relatively strong molecular structure because of the combination of strong chemical bonds. It has greater stiffness than can be found in most Polyurethanes. It’s greater bond strength also means it is more difficult to break. PIR is chemically and thermally more stable.

PIR typically has an MDI/polyol ratio, also called its index higher than 180. By comparison PUR indices are normally around 100. As the index increases material stiffness also increases. This means it is more suitable for use where greater rigidity is required and/or enhanced thermal stability is desirable. A range of PIR products are available, designed to suit specific needs.

Uses: Polyisocyanurate insulation boards

PIR is typically produced as foam and used as rigid thermal insulation. Foam panels laminated with pure embossed aluminium foil are used for making pre-insulated duct that is used for heating, ventilation and air conditioning systems. Prefabricated PIR sandwich panels are manufactured with corrosion-protected, corrugated steel facings bonded to a core of PIR foam and used extensively as roofing insulation and vertical walls for:

  • warehousing,
  • factories,
  • office buildings etc.).
  • industrial and commercial pipe insulation, and
  • carving/machining media (competing with expanded polystyrene and rigid polyurethane foams).

We have a mobile machine which is able to do this anywhere in Australia.

It takes a lot of experience to use this product and Gunspray has the experience to ensure all voids are filled and the job is completed correctly.


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