Tempered glass products should be controlled as to stresses to ensure their conformity to standards. A strain viewer is a practical, non-destructive apparatus to control products as well as production conditions.

SOFTECO strain viewer consists of a light source with polarizing filter ( polarizer ), and another polarizing filter ( analyzer ), with _ wave retarder.

With the apparatus a stress pattern can be seen and stress-defects detected in color. Faults or changes in production can be followed by comparing the stress pattern of a test-piece with a sample previously tested and known as a good one.

APPLICATION

• No glass size limitation
• Movable construction
• Verification of stress pattern of glass
• Detection of irregularities caused by molds
• Detection of faults caused by temperature gradients
• Detection of faults due to quenching irregularities