QCI offer an increasing range of instruments for examining the birefringence found in most transparent glass and plastic products. Birefringence patterns made visible by polarized light can reveal valuable information such as molding defects and stress. <br/>Our equipment can be found in the lab and on the production line of manufacturers worldwide. Used for examining glass products including tableware, scientific glassware ampoules and vials along with many plastic products including PET preforms.