What is the maximum service temperature for mineral wool pipe insulation?

It depends on density. For density ≥ 140 kg/m³, it is 750°C. For density 100 to <140 kg/m³, it is 650°C (Table 3).

What is the maximum allowed thermal conductivity (k-value) for insulation with density ≥ 100 kg/m³?

At a mean temperature of 50°C, the k-value must be ≤ 0.040 W/m.K (Table 2).

What is the standard length of a mineral wool pipe section?

The standard length is 1000 mm, with a tolerance of ±5 mm (Table 1).

Is this material combustible?

No, the material shall be non-combustible when tested in accordance with IS 3144 (Clause 4.8).

IS 12400 Part 1

: 2018

Thermal Insulating Materials - Mineral Wool - Blanket Type - Specification

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This standard specifies the requirements for mineral wool blankets, including rock wool and slag wool, used for thermal insulation purposes. It covers physical properties like density and thermal conductivity, dimensions, tolerances, and testing criteria for materials used in applications with service temperatures up to 750°C.

Specifies requirements for mineral wool blanket type thermal insulating materials used in buildings and industrial applications.

Quick Reference Values

Standard length of pipe section1000 mm

Length tolerance± 5 mm

Thickness tolerance± 3 mm or ±10%, whichever is greater

Max thermal conductivity (density ≥ 100 kg/m³ at 50°C mean temp)0.040 W/m.K

Max thermal conductivity (density ≥ 100 kg/m³ at 100°C mean temp)0.048 W/m.K

Maximum service temperature (density 100 to <140 kg/m³)650 °C

Maximum service temperature (density ≥ 140 kg/m³)750 °C

Practical Notes

Ensure the correct density is specified for the required maximum service temperature as per Table 3.

The outer diameter of the insulation must match the pipe's outer diameter, and sections must be tightly butted to avoid thermal bridges.

For cold applications or to prevent moisture ingress, an appropriate vapor barrier (e.g., FSK facing) is crucial and must be specified.