Does any one know? This kind of glassware is dangerous to use because it has stress points where the glass break.
Unannealed glass has that property.
The answer is "chipped"
Yes, there are certain types of glassware that can be dangerous to use due to stress points that can cause the glass to break. To identify whether a glassware has stress points or not, you can follow these steps:
1. Check for imperfections: Inspect the glassware for any visible imperfections such as scratches, chips, or cracks. These can weaken the integrity of the glass and create stress points.
2. Inspect the glassware for stress lines: Stress lines are small hairline cracks that are often difficult to detect. Hold the glass up to the light and examine it closely for any fine lines running along the surface. Stress lines can indicate weak points in the glassware.
3. Tap the glass lightly: Gently tap the glassware with a metal spoon or a similar object. If the glass is of poor quality or has stress points, it may produce a dull, thud-like sound instead of a clear, resonating tone. This can be an indication of potential stress points.
4. Consider the age and condition: Glassware that is old, worn, or has been frequently subjected to thermal stress (such as rapid temperature changes) is more likely to have stress points. The constant expansion and contraction of the glass can weaken it over time.
It's important to note that even with careful inspection, stress points might not always be visible. If you have any doubts or concerns about the safety of your glassware, it's best to replace it with a new, high-quality alternative to avoid potential accidents.