What is the primary property to check for insulation effectiveness?

Thermal conductivity (k-value). A lower value indicates better insulation. Refer to Table 2 for maximum permissible values at different mean temperatures.

Is glass wool fire-safe?

The base material is classified as 'Non-combustible' as per IS 3144. However, the overall fire rating depends on the binder and any facing material used.

What forms of glass wool does this standard cover?

The standard covers loose wool, mattresses (blankets/quilts), and resin-bonded slabs/boards (Clause 3).

What is the maximum temperature unfaced glass wool can be used at?

The maximum service temperature for unfaced glass wool is 230°C. For faced materials, the facing's temperature limit is often lower and becomes the deciding factor (Clause 5.4).

IS 14214

: 1995

Specification for glass wool thermal insulation materials

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This standard specifies the requirements, testing methods, and sampling for glass wool thermal insulation materials. It covers loose wool, mattresses (quilts), and resin-bonded slabs used for thermal and acoustic insulation in buildings and industrial applications, defining key properties like thermal conductivity, density, and fire safety.

Specifies requirements for glass wool thermal insulating materials.

Quick Reference Values

Maximum Service Temperature (Unfaced)230 °C

Maximum Thermal Conductivity at 50°C mean temp0.045 W/(m.K)

Nominal Density Range12 to 96 kg/m³

Fire Safety Classification (Base Material)Non-combustible

Maximum Moisture Content by Mass1.0 %

Maximum Alkalinity (as Na2O)0.5 %

Practical Notes

The facing material (like aluminum foil or vinyl) often dictates the overall service temperature and fire performance, not just the base glass wool.

Density is not a direct measure of thermal performance; always check the specified thermal conductivity (k-value) for the intended operating temperature range.

Proper personal protective equipment (PPE), including gloves, masks, and goggles, is essential during handling and installation to prevent skin and respiratory irritation from glass fibers.