PIR Panels by Rinac
Fire-rated polyisocyanurate sandwich panels for cold rooms, cleanrooms and pharma. B2 standard and FM-approved B1, in 30 to 200 mm thickness.
PIR panels use a polyisocyanurate core, a close cousin of polyurethane that chars rather than melting when exposed to fire. That single change lifts the fire classification from B3 to B2, and to B1 in the FM-approved version, while keeping the thermal and structural performance that makes sandwich panels efficient. For pharma, food and cleanroom projects where fire class is written into the spec, PIR is usually the starting point.
Rinac supplies PIR across the same panel geometries as PUF, so you can hold the design and simply step up the core. PIR runs a K-value of 0.020 W/mK or better, and the FM-approved PIR reaches 0.019 W/mK with a B1 rating certified to BS1D0 and EN 13501-1.
Why PIR for pharma, food and cleanrooms
Insurers and regulators increasingly ask for a defined reaction-to-fire class on the building envelope. RPUF is self-extinguishing but rated B3. Standard PIR moves to B2, and Rinac CoolTop PIR roofing is certified as a CLASS O building material under BS 476 Part 6 & 7. The FM-approved PIR reaches B1 and meets BS1D0 and EN 13501-1, the level typically demanded for pharmaceutical and high-value food facilities. Choosing the right class up front avoids costly rework at inspection.
PIR and FM PIR panel specifications
Published values for the Rinac PIR and FM-approved PIR cores.
| Property | PIR | FM PIR |
|---|---|---|
| Thermal conductivity / K-value | ≤ 0.020 W/mK | ≤ 0.019 W/mK |
| Core density | 40 ± 2 kg/m³ | 42 ± 2 kg/m³ |
| Fire performance | B2 (CLASS O to BS 476 Pt 6 & 7) | B1 |
| Fire standard | BS 476 Part 5 | BS1D0, EN 13501-1 (FM approved) |
| Compressive strength | 150–250 kPa | 150–250 kPa |
| Thickness options | 30 to 200 mm | 30 to 200 mm |
| Standard panel width | 1000 mm | 1000 mm |
Standard thicknesses: 30, 40, 50, 60, 75, 80, 100, 120, 150, 200 mm (custom available).
Where PIR sits in the Rinac range
InstaBuild PIR
PIR and FM PIR wall and ceiling panels, 30 to 200 mm, airtight tongue-and-groove joints for clean environments.
View InstaBuild RoofingCoolTop PIR
Fire-rated PIR roofing to 200 mm, certified CLASS O, for factories and warehouses needing a higher roof fire class.
View CoolTop RoofingInstaRoof PIR
Interlocking 30 and 50 mm roof panels available with a PIR core for improved fire performance.
View InstaRoofFire-sensitive applications
Pharmaceutical Cleanrooms
PIR and FM PIR panels for clean zones, ante rooms and controlled environments where fire class is specified.
Food Processing
Hygienic, fire-rated envelopes for food and dairy plants working to strict safety standards.
Cold Rooms
Fire-sensitive cold storage where a B2 or B1 core is preferred over standard RPUF.
Warehousing & Logistics
Higher fire-class roofing and walls for large-footprint storage buildings.
Industrial Facilities
Plants and utilities where insurer requirements call for FM-approved construction.
Commercial Buildings
Institutional and commercial interiors that need both insulation and a defined fire rating.
Frequently asked questions
Specifying a fire-rated envelope?
Send us the fire class and application. Rinac will recommend PIR or FM-approved PIR at the right thickness and finish.
