Toughened glass for vehicles is used for most window glass, except for windshield glass, and in particular is also generally used for sunroofs installed on the roofs of vehicles. Toughened glass is known to have external impact resistance that is about four times stronger than original glass.

We would like to verify that ceramic-printed toughened glass does not meet of GTR(Global Technical Regulations) No. 6 and its strength is lower than original glass through tests.

The tests were conducted with the test piece of original glass, toughened glass, and ceramic-printed toughened glass from five glass manufacturers. In Test 1, a 227g steel ball was dropped from a height of 2 meters, and damage was checked according to the test method of GTR No. 6, and in Test 2, a steel ball was freely dropped from different heights and limited damage height was determined.

In the result of Test 1 according to the test method of GTR No. 6, while all five test pieces of toughened glass were not damaged, all the ceramic-printed toughened glass from the five manufacturers were damaged.

In the result of Test 2, none of the five test pieces of toughened glass were damaged by a 10m ball drop, the original glasses were damaged by an average of 3m ball drop, and the ceramic-printed toughened glasses were damaged by an average of 1.4m ball drop.

As the results of the tests show, ceramic-printed toughened glass does not have the features of toughened glass due to its very low strength.

Therefore, we would like to contribute to the safety of consumers by considering the GTR No.6, and by revising the toughened glass test method.