The ASTM C1652 test method is used for inspection of laminated and tempered automotive glass in transmitted light. The digital imaging test method provides accurate data for evaluating the optical properties of the glass being inspected.
ASTM C1652 Measuring Optical Distortion in Flat Glass Products Using Digital Photography of Grids
What is ASTM C1652?
ASTM C1652 Sample Preparation Guide
The tolerances range for a ASTM C1652 test specimen = +/- 2 mm to +/- 1mm
Wave pattern = (300-400 mm).
What is the Test Procedure and Requirements for ASTM C1652?
In the ASTM C1652 test method, the reflected image of the processed glass is photographed, and the photographic image is analyzed to quantify the distortion due to surface waviness. This method works by obtaining a picture of a grid pattern distorted by a transparent object and evaluating it against an undistorted image of the grid pattern. A digital camera records the appearance of a grid pattern that has been reflected from or transmitted through the glass. They are noncontact and measure the entire surface of the glass. Computer software analyzes the digitized images and displays surface distortion, waviness, or quantifies the lens power or optical distortion (mdpt) for approximately every square inch (645.16 mm2) of the entire glass surface.
Analysis Result and Interpretation
The standard method ASTM C1652 covers the optical distortion measurement of heat-strengthened and fully tempered architectural glass substrates.
The following data are calculated in the ASTM C1652 test:
- Optical Distortion (roll wave peak-to-valley depth and mdpt)
- Lens Power (positive and negative).
Updated on August 8, 2026
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