IS 17533:2021 is the Indian Standard (BIS) for polyisocyanurate (pir) foam for thermal insulation - specification. This standard specifies the requirements, sampling methods, and tests for rigid polyisocyanurate (PIR) foam intended for use as thermal insulation. It covers material properties such as thermal conductivity, density, compressive strength, and fire performance for PIR supplied in boards, blocks, or other forms.
Specifies requirements for polyisocyanurate (PIR) foam used for thermal insulation.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Density | Prescribed by Class: Class A (32±2 kg/m³), Class B (40±2 kg/m³), Class C (50±3 kg/m³) | Not a primary property, but declared by manufacturer. Performance-based. | EN 13165:2012+A2:2016 |
| Compressive Strength (at 10% deformation) | ≥ 150 kPa | Declared level, e.g., CS(10\Y)120 (≥120 kPa), CS(10\Y)140 (≥140 kPa), etc. | EN 13165:2012+A2:2016 |
| Thermal Conductivity (Aged λ-value) | ≤ 0.027 W/(m·K) | Declared by manufacturer based on specified aging procedures. No single limit; typical declared values are 0.022-0.028 W/(m·K). | EN 13165:2012+A2:2016 |
| Closed Cell Content | ≥ 90 % | ≥ 90 % | ASTM C1289-23 |
| Water Absorption (Short term, partial immersion, 24h) | ≤ 0.1 kg/m² | Declared by manufacturer, e.g., Level WS(P)0.5 corresponds to ≤ 0.5 kg/m². | EN 13165:2012+A2:2016 |
| Dimensional Stability (Change in length/width at 70°C, 90% RH) | ≤ 1.0 % | Declared level, e.g., DS(70,90)1 corresponds to ≤ 1%; DS(70,90)2 corresponds to ≤ 2%. | EN 13165:2012+A2:2016 |
| Tensile Strength Perpendicular to Faces | ≥ 80 kPa | Declared level, e.g., TR80 corresponds to ≥ 80 kPa. | EN 13165:2012+A2:2016 |