How to determine the material quality of glass water bottles?

1、 Appearance observation: Check the transparency and craftsmanship details
borosilicate glass
The transparency is extremely high, with no obvious impurities or bubbles under the illumination of light. The pot body is uniformly transparent, and objects on the opposite side can be clearly seen.
Hand blown high borosilicate pot, with smooth transition at the interface and no obvious seams or burrs; The machine pressed product has regular edges and uniform thickness.
High quality borosilicate pots are usually labeled with the words borosilicate glass, and some high-end models may also have brand logos.
Tempered Glass
The transparency is slightly lower than that of high borosilicate glass, and there may be a slight "haze" on the surface, but there are no obvious defects overall.
The edges of the tempered glass pot will be polished to give a smooth and rounded feel; The pot body is relatively thick and has strong impact resistance.
Attention: Tempered glass will break into particles without sharp edges, which can be judged by observing the sample fragments.
Ordinary sodium calcium glass
Poor transparency, may have slight yellow green or gray color, and is prone to process defects such as bubbles and sand holes inside.
The thickness of the pot body is uneven, the interface is rough, and there are even obvious traces of glue; The price is usually very low, you can buy it for a few tens of yuan.
2、 Touch test: Weigh and feel the texture
Weight comparison
Under the same size, high borosilicate glass pots are the lightest because of their low material density and uniform thickness;
The tempered glass teapot has a moderate weight and a relatively heavy thickness;
Ordinary glass pots are also heavy in weight, but they feel stuffy and lack the crisp texture of glass.
Tap and listen to the sound
Lightly tap the pot body with your fingers, and the sound emitted by the high borosilicate glass is crisp and echoes, similar to the texture of tapping crystal;
The sound of tempered glass is slightly dull, but louder than ordinary glass;
The sound of ordinary glass is cloudy, short, and has no obvious echo.
Touch sensation
The surface of the high borosilicate glass pot is smooth and delicate, without any astringency;
Ordinary glass pots may have burrs or uneven areas, especially at the bottle mouth and cigarette tube interface.
3、 Heat resistance verification (critical testing, cautious operation)
Heat resistance is the core indicator for distinguishing glass materials, and safety should be taken into account during testing to avoid damage caused by excessive temperature differences
Warm water test
Pour about 40 ℃ warm water into an empty pot, let it stand for 1 minute, then pour out the warm water and immediately add room temperature water.
High borosilicate glass: no changes, no cracks will appear;
Tempered glass: unlikely to crack, but repeated testing may result in hidden damage;
Ordinary glass: may explode directly or show obvious cracks.
Precautions
Do not directly test with boiling water, especially for pots of unknown materials, to avoid explosion and injury;
Before testing, ensure that the pot body is dry and undamaged, and keep away from children and fragile items during operation.