What is the main difference between Type R and Type P materials?

Type R is cellular rubber, which generally has better flexibility and a higher water vapor resistance (μ ≥ 7000). Type P is cellular plastic, with a lower minimum density and μ-value (μ ≥ 3000). (Table 1 & 2)

What is the required fire rating for insulation under this standard?

The material must achieve Class 1 for Surface Spread of Flame when tested according to BS 476 (Part 7). (Table 1 & 2)

What is the maximum thermal conductivity allowed for cellular rubber insulation?

0.040 W/(m·K) when tested at a mean temperature of 40°C. (Table 1)

Are there specific dimensional tolerances I should check?

Yes, Tables 3 and 4 specify tolerances for length, width, and thickness for both sheets and tubes, which are crucial for proper site fitment.

IS 17430

: 2020

Cellular rubber and plastic materials for thermal insulation of HVAC systems - Specification

CurrentFrequently UsedSpecificationBIMMEP · Insulation Materials

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This standard specifies the requirements and test methods for preformed cellular rubber and plastic insulation materials, supplied as sheets and tubes. It is primarily used for the thermal insulation of HVAC pipework, ductwork, and equipment to prevent energy loss and condensation.

Specifies requirements for cellular rubber and plastic materials for thermal insulation of HVAC systems.

Quick Reference Values

Max Thermal Conductivity (Cellular Rubber at 40°C)0.040 W/(m·K)

Min Density (Cellular Rubber)40 kg/m³

Max Thermal Conductivity (Cellular Plastic at 40°C)0.045 W/(m·K)

Min Density (Cellular Plastic)28 kg/m³

Fire Performance (Surface Spread of Flame)Class 1 as per BS 476 (Part 7)

Max Longitudinal Shrinkage7%

Min Water Vapour Resistance Factor (μ)7000 for Type R, 3000 for Type P

Practical Notes

Ensure manufacturer's test certificates are checked during material submittal, especially for thermal conductivity (k-value) and fire rating.

The μ-value (water vapour resistance factor) is critical for condensation control on chilled water pipes; verify it meets project requirements.

Proper installation, including using compatible adhesives and ensuring all joints are fully sealed, is as important as the material itself for system performance.