What is the maximum temperature mineral wool can be used at according to this standard?

The maximum service temperature is 750°C, as specified in Table 1 and Table 2.

Is mineral wool considered fireproof by this IS code?

The material is classified as 'Non-combustible' when tested in accordance with IS 11239 (Cl 7.1.6).

What is the specified thermal conductivity (k-value) for mineral wool slabs?

The maximum thermal conductivity is 0.046 W/(m.K) at a mean temperature of 50°C (Table 1). Product-specific values from manufacturers may be lower.

What are the standard densities covered in this IS code?

For slabs, it covers Group 1 (100 kg/m³) and Group 2 (150 kg/m³). For pipe sections, it covers densities of 120 and 150 kg/m³ (Table 1 & 2).

IS 8183

: 1993

Specification for rigid mineral wool thermal insulating materials

CurrentFrequently UsedSpecificationBIMMEP · Insulation Materials

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This standard specifies the requirements for rigid mineral wool (rock wool and slag wool) thermal insulation materials, supplied as slabs or preformed pipe sections. It covers material properties, dimensions, and physical requirements like thermal conductivity, density, and fire performance, along with testing and conformity criteria.

Specifies requirements for rigid mineral wool thermal insulating materials.

Quick Reference Values

Maximum thermal conductivity (slabs at 50°C mean temp)0.046 W/(m.K)

Maximum service temperature750 °C

Minimum density (Group 1 slabs)100 kg/m³

Minimum density (Group 2 slabs)150 kg/m³

Minimum compressive strength (Group 2 slabs at 10% deformation)5.0 kPa

Water vapour permeance (max)0.60 ng/Pa.s.m²

CombustibilityNon-combustible

Practical Notes

Always wear appropriate PPE (gloves, masks, goggles) when handling mineral wool to avoid skin and respiratory irritation from loose fibers.

Ensure insulation is kept dry during storage and installation as moisture significantly degrades its thermal performance.

While mineral wool itself is non-combustible, the binders and any facing materials (like foil) may be combustible and affect the overall fire rating of the composite product.