1. Transparency: The material of high-quality glass bottles should be clear and transparent, allowing for a clear view of the contents. If there are bubbles, impurities, or uneven colors inside the bottle, it may be due to problems during the melting and preparation process, resulting in impure materials.
2. Hardness: High quality glass bottle materials should have a high hardness and be less prone to scratches and wear. Gently buckle the bottle wall with your nails. If obvious marks are left, it indicates that its hardness is low.
3. Weight: Under the same volume, heavier glass bottles may have higher density and therefore better quality. If you feel that the weight of the bottle is too light or heavy, it may be of poor quality.
4. Temperature: High quality glass bottles should not exhibit significant thermal expansion and contraction when temperature changes, indicating good thermal stability.
5. Heat resistance: It can be tested by boiling water on the bottle wall. If the bottle does not deform significantly or produce odors after heating, then its heat resistance is better.
6. Sealing: High quality glass bottles should have good sealing performance to prevent liquid leakage. When purchasing, you can check whether the bottle cap is tight and whether there is any air leakage.
|