Cased glass assessment

Residual stress assessment conducted where two (or more) glasses are fused together to form a final product, for example wine glasses with coloured glass stem and clear bowl, or enamel decoration.

This interpretive assessment is conducted to assess any residual stresses between the two glasses and can include scratch tests; however measurement of stress can also be carried out using a microscope fitted with a Berek compensator.

Where further information or support is required, our facilities and specialist knowledge in glass allow us to provide direct measurement of thermal expansion/shrinkage for the different compositions giving the coefficient of thermal expansion for each type. Technical consultancy for process optimisation or even compositional development or modification to help resolve mis-matches between different materials or compositions can also be offered on request.