Mineral Wool Insulation K Values

Overview

Engineering reference data for Mineral Wool Insulation K Values in insulation.

Key Formulas

Thermal Resistance

$R = \frac{L}{kA}$

Resistance to heat flow.

Heat Loss

$Q = \frac{\Delta T}{R_{total}}$

Temperature difference / total resistance.

Variables

Material Composition

Mineral wool is produced by spinning molten glass, stone, or slag into a fiber-like structure. The typical composition of stone wool includes:

• Inorganic content: 98% (rock or slag)
• Organic content: 2% (thermosetting resin binder and oil)

The inorganic nature of mineral wool provides inherent fire resistance and dimensional stability at elevated temperatures.

Temperature Conversion

To convert between Fahrenheit and Celsius temperature scales when using thermal conductivity values:

$T(°C) = \frac{5}{9} \left(T(°F) - 32\right)$

$T(°F) = \frac{9}{5} \times T(°C) + 32$

Thermal Properties Notes

The thermal conductivity (k-value) of mineral wool varies with temperature. When selecting k-values from reference tables or charts, ensure the correct temperature scale is used and apply the conversion formula above as needed.

Key performance characteristics of mineral wool insulation:

• Non-combustible material
• High temperature resistance — maintains structural integrity at elevated temperatures
• Low thermal conductivity — effective insulation across a wide temperature range
• Moisture resistant — inorganic fibers do not absorb water

References

• Original Source