Easy Ways to Tell Difference Between Tempered Glass And Ordinary Glass

Put on a pair of polarized sunglasses and look at the glass surface. You will notice obvious colorful stripes appearing on tempered glass, while no such patterns can be seem on regular non-tempered glass.

You can also adjust your viewing angle to check for wind pressure marks on the glass surface. When observing tempered glass from different angles, you can spot irregular visual distortion across the entire panel, which does not show up on common glass.

Another practical trick is to check the glass edges directly. During the tempering process, glass will soften under high temperature. Resting on conveyor rollers leads to uneven flatness after cooling. When you place two pieces of glass face to face closely, the gap formed in the middle will present an obvious oval shape.

In short, tempered glass always has poorer flatness compared with standard ordinary glass.

Here is the most convenient identification method. Stand two pieces of glass upright and attach them face to face tightly. Observe the long sides where they touch each other carefully. Check if there are visible gaps between the edges and whether these gaps form regular arcs. If the above features exist, the glass is confirmed to be tempered. Remember to align the front sides together instead of placing them back to back.

If you do not have proper tools for visual observation, you can use two exposed X-ray films for auxiliary inspection.

When you view the glass sideways at around 70 degrees, distinct blue wind marks unique to tempered products will come into sight. Meanwhile, you can clearly tell that its surface flatness is much lower than that of original untreated glass.