Tiny Invisible Scratches: The Hidden Danger of Glass Sudden Breakage

Tiny invisible scratches on glass surfaces are often ignored by home users, especially on the frequently used tempered glass lid that undergoes daily cleaning and friction. Most people think a faint scratch on the glass lid has no impact on normal use, but these minor marks are actually hidden triggers for sudden breakage of the tempered glass lid, which may cause scalding accidents during high-temperature cooking.

The surface of a qualified tempered glass lid has a uniform compressive stress layer, which is the core structure supporting the impact resistance of the glass lid. Tiny scratches will cut through this protective stress layer, breaking the internal stress balance of the tempered glass lid. At first, these scratches are too small to be noticed, but they will gradually expand under repeated temperature changes, friction and slight collisions in daily use.

For a commonly used kitchen glass lid, scratches are mostly caused by improper cleaning methods, such as scrubbing the glass lid with steel wool, or stacking the glass lid with metal tableware and hard cookware. Long-term high-temperature steaming will accelerate the expansion of micro-cracks, and once the stress limit is exceeded, the tempered glass lid will suddenly shatter without warning. Even a stainless steel wrapped glass lid is not immune, as friction between the metal edge and the glass body will also produce invisible edge scratches.

To reduce the breakage risk of the glass lid, it is recommended to clean the tempered glass lid with soft sponges or cloths, avoid contact with sharp hard objects, and regularly check for surface scratches. If obvious deep scratches appear on the glass lid, it should be replaced in time to eliminate hidden safety hazards.