Thermal conductivity of 90° rotated mineral wool material

Related services Thermal conductivity

We noticed that some customers provided us with samples with 90° rotated mineral wool insulation material. Shown below is an example. The mineral wool material was rotated by 90°. The test result is significantly higher than the typical thermal conductivity of mineral wool materials. The reasons are explained in this post.

As shown in the sketch below. the mineral wool fibers are aligned in a layered structure.

  • In the normal installation, the heat flow direction is perpendicular to the layered structure. The thermal resistance is greater and the thermal conductivity is lower.
  • In the 90° rotated installation, the heat flow direction is parallel to the layered structure. The thermal resistance is smaller and the thermal conductivity is greater.

A comparison is presented in this page. In this study, the thermal conductivity is 39% higher when the mineral wool material is 90° rotated.

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