What is the main purpose of this standard?

To ensure the quality and performance of PU and PIR foam boards used for thermal insulation by setting minimum physical, thermal, and fire safety requirements.

How is the insulation performance measured?

Primarily by the 'Thermal Conductivity' (λ-value), which must be as low as possible. The manufacturer must declare the value, and the tested value must not exceed the declared value by more than a specified tolerance (Clause 6.1 and Table 1).

What does 'Class 1' signify?

It refers to a classification in Table 1 that requires a minimum apparent core density of 35 kg/m³ and a minimum compressive strength of 150 kPa, among other properties.

Is PIR foam better than PU foam according to this standard?

The standard covers both without explicitly stating one is better, but PIR's chemical structure inherently provides better thermal stability and fire performance, which are desirable properties listed in the standard's requirements.

IS 13919

: 2018

Rigid cellular polyurethane (PU) and polyisocyanurate (PIR) foam for thermal insulation - Specification

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This standard specifies the requirements and test methods for rigid cellular polyurethane (PU) and polyisocyanurate (PIR) foam boards used for thermal insulation. It classifies the foam based on physical properties like density and strength and sets limits for thermal conductivity, water absorption, dimensional stability, and fire performance.

Specifies requirements for rigid cellular polyurethane (PU) and polyisocyanurate (PIR) foam for thermal insulation.

Quick Reference Values

Minimum Apparent Core Density (Class 1)35 kg/m³

Minimum Compressive Strength (Class 1)150 kPa

Maximum Thermal Conductivity (Typical)0.023 W/(m·K)

Maximum Water Absorption by Volume (7 days)2.0 %

Minimum Closed Cell Content90 %

Maximum Dimensional Change (at 70°C, 48h)1.5 %

Practical Notes

PIR foam generally offers better fire resistance and dimensional stability compared to PU foam, making it preferable for high-performance applications.

Always check the facing material (e.g., aluminum foil, glass fiber tissue) as it critically impacts the board's mechanical properties, water vapor resistance, and surface fire characteristics.

Verify that the supplied material has a manufacturer's test certificate confirming compliance with all requirements in Table 1 for the specified class.