Polyisocyanurate (/ ˌpɒlɪˌaɪsoʊsaɪˈænjʊəreɪt /), also referred to as PIR, polyol, or ISO, is a thermoset plastic [1] typically produced as a foam and used as rigid thermal insulation.

TRYMER PIR (polyisocyanurate) is a closed-cell, foam insulation for industrial pipes, vessels, and equipment. TRYMER PIR can be used in applications that operate at temperatures ranging from …

PIR (polyisocyanurate), typically cut into boards, can be used in insulated metal panels, wall cavities and as insulated plasterboard. PIR has such a high thermal performance, it requires only half the …

Jun 27, 2025 · Discover polyisocyanurate foam—a rigid thermoset insulation with superior thermal performance and fire resistance. Learn about its properties, manufacturing process, and applications …

Oct 7, 2020 · Polyisocyanurate thermal insulation, commonly referred to as polyiso, has proven to be popular due to a combination of its cost effectiveness (i.e. cost per insulation unit), efficiency (i.e. …

Polyisocyanurate, often abbreviated as PIR, is a type of plastic commonly used in the construction industry due to its excellent insulation properties. It’s a thermoset polymer that is essentially an …

What (exactly) is Polyiso? Polyiso, or polyisocyanurate, is a rigid foam insulation used in more than 70% of commercial roof construction and offers a continuous insulation solution for commercial flat (low …

POLYISO is most commonly used as a continuous insulation for roofs and walls, and as a protective roof cover board. POLYISO’s unique chemistry delivers industry-leading R-value and fire …

Closed Cell Polyisocyanurate Foam Core: Provides high R-value per inch in built-up, modified bitumen, metal roof and single ply roof systems, and approved for direct application to steel decks.

Polyisocyanurate (Polyiso) roof insulation by Siplast provide high-performance and cost-effective solutions for roofing insulation demands.