Thermal Expansion

The thermal expansion analysis measures the dimensional variations of a material subjected to a heat treatment as a function of the temperature.

The thermal expansion of incoherent materials (like sands), plastic materials (like glasses or polymers above their glass transition temperature), extremely thin samples (having thickness of tens microns) or soft materials (like felt or wax) cannot be studied by means of traditional dilatometry.

Thanks to optical non-contact dilatometry it is possible to cover a larger field of analysis: also materials with a viscous behaviour or samples showing limitations in their dimensions, shape or rigidity can be measured during the whole heat treatment applied.

The double beam optical dilatometers allow to carry out thermal expansion measurements with no contact and no interference caused by the measuring system; the use of two beams of light allows to achieve an absolute measurement of the dimensional changes of the sample during the heat treatment.