What are the main forms of rock wool covered by this standard?

Loose rock wool, bonded rock wool slabs, and resin bonded rock wool mattresses (Clause 3).

What is the maximum service temperature for rock wool specified in IS 15474?

Up to 750°C, depending on the product type and classification.

What is the primary standard for testing rock wool properties?

IS 3144: Methods of test for mineral wool thermal insulation materials.

What is the maximum allowable 'shot content'?

The maximum shot content by mass is 20 percent (Table 1, 2, 3).

IS 15474

: 2004

Specification for rock wool thermal insulating materials

CurrentSpecializedSpecificationBIMMEP · Insulation Materials

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This standard specifies the requirements for various forms of rock wool thermal insulation, including loose fill, bonded slabs, and resin-bonded mattresses. It defines classifications based on density and service temperature, and outlines mandatory physical properties such as thermal conductivity, shot content, and fire resistance. The code serves as a procurement and quality assurance benchmark for rock wool used in thermal and acoustic applications.

Specifies requirements for rock wool thermal insulating materials.

Quick Reference Values

Maximum Service Temperature750 °C

Density Range for Bonded Slabs48 to 160 kg/m³

Thermal Conductivity (100 kg/m³ slab at 50°C mean temp), Max0.042 W/(m·K)

Shot Content by Mass, Max20 %

Alkalinity as Na2O, Max3 %

Loss on Ignition for Bonded Products, Max5 %

Practical Notes

Pay close attention to 'shot content' as higher values significantly reduce thermal performance and can be a handling nuisance.

Ensure the material's maximum service temperature rating is appropriate for the application (e.g., high-temperature industrial pipes vs. residential building walls).

Always use proper Personal Protective Equipment (PPE) like gloves, masks, and long sleeves during handling and installation, as the fibres can cause skin, eye, and respiratory irritation.