To ensure that a retread tyre will offer the best possible performance, any defects must be identified. One of the most common defects in a radial tyre are separations within the casings, particularly in super singles due to the high level of lateral scrub. Unfortunately, these are also the hardest to find, as they are often deep within the belt construction under the tread. As a result of new technology TTS are the first retreaders in the UK to introduce Shearography inspection of their production. This non-destructive test enables the detection of these invisible separations together with other defects. Laser video cameras within the machine scan the tyre, first at atmospheric pressure then under a partial vacuum. Any defects in the scanned area result in a microscopic deformation due to the alternating pressure. The laser records these microscopic deformities, which are processed by an advanced analysis software program. The results are displayed on a VDU screen and are stored on a database for future reference.