# Slab

## Bulk measurement of thin highly conductive sheets

The slab method is intended for studies of the thermal conductivity and thermal diffusivity of medium- or high conducting materials of the most common commercial geometrical shape: a sheet of material with a well defined thickness. A piece of this sheet is here referred to as a slab and the Hot Disk sensor is placed between two slab samples having the same thickness.

This method is very similar to the standard method, with two main differences. Firstly, the outside, lateral surfaces of the slabs need to be insulated by a material with low thermal conductivity in order to reduce the heat losses to the surroundings. Heat losses should be low compared with the total output of power in the sensor during the transient recording. Secondly, heat propagates mainly in the direction of the slab plane and it is assumed that the sample is “infinite” in this plane.

The solution of the thermal conductivity equation for the slab sample geometry utilizes the method of images. The developed software covers experimental situations with any combination of slab thickness divided by Hot Disk sensor radius accordingly:

$0.03125 < \frac{h}{a} < 0.79836$

## Specifications

### TPS 3500

 Thermal Range: 1 to 1800 W/mK Temperature: -160°C to 1000°C Thickness Range: 0.042 to 10 mm Minimum Dimensions: 8 mm diameter or square

### TPS 2500 S

 Thermal Range: 1 to 1000+ W/mK Temperature: -160°C to 1000°C Thickness Range: 0.1 to 10 mm Minimum Dimensions: 10 mm diameter or square

### TPS 2200

 Thermal Range: 1 to 500 W/mK Temperature: -160°C to 750°C Thickness Range: 0.1 to 10 mm Minimum Dimensions: 15 mm diameter or square

### TPS 500 S

 Thermal Range: 1 to 200 W/mK Temperature: -160°C to 300°C Thickness Range: 0.1 to 10 mm Minimum Dimensions: 15 mm diameter or square