High borosilicate glasses can generally be divided into general sodium calcium glass, tempered glass, and high borosilicate glasses, but these three types of glasses are difficult to distinguish from each other in appearance. It is very difficult to accurately identify the raw materials of high borosilicate glass cups during the process of artificially melting and temporarily buying high borosilicate glass cups. So how to verify if the glass cup is high borosilicate heat-resistant glass?
High borosilicate glass cup:
The high borosilicate glass cup can withstand an instantaneous temperature difference of about 150 ℃, making it safe to hold both hot and cold drinks. The primary processes are manual blowing and semi-automatic assembly lines, with special limitations. Generally, glass can accept an instantaneous temperature difference of 75 ℃, and it is recommended to drink cold drinks, plain water, etc. The first priority is to limit the process and iron pipe blowing process. Tempered glass does not advocate containing liquids.
The artificially blown high borosilicate glass cup is primarily made of high borosilicate glass tubing, which is softened at high temperature and then placed in a mold for rotational blowing or fixed blowing. The glass manufacturer notified us. Blown products are ubiquitous and thin. The thickness of a typical high borosilicate glass cup and coffee set artificially blown is around 1.2-1.8 mm, while the thickness of a pot is around 1.8-2.2 mm. Occasionally, there may be straight cups or pots that are very thick, which is due to the lack of blowing and the use of raw materials and pipes, so they can reach a thickness of 2-4mm.
A double-layer high borosilicate glass cup must be a cup made of high borosilicate heat-resistant glass material. A glass cup with a handle, light and thin, with a thickness of less than 2mm, must be a high borosilicate glass cup. If it is very thick, then it depends on whether there is a mold mark on the handle. If there is, it is not heat-resistant glass (except for rare cases), and if there is not, it is heat-resistant glass. If you stick the handle on, carefully look at the connection between the handle and the cup body, and you will definitely see that it is different, not symmetrical, and not perfect. Generally, if the bottom of a straight cup is very thick, it must be limited. Due to manual work, thickening the bottom to 2 centimeters is almost priceless, and the thickness may not be consistent, making it ugly and not worth the loss. In addition to the above methods, we can choose the following methods for rapid identification.
Differentiation method for high borosilicate glass cups:
1. Can put the cup in the refrigerator, refrigerate for 24 hours, take out and pour 100 degrees hot water, if it bursts, it must not be a high borosilicate glass.
2. The high borosilicate glass cup has better transparency, finer body, and smoother feel. High temperature resistance and resistance to sudden cooling and heating are the biggest characteristics of high borosilicate glass cups.
3. A glass cup is a cup made of glass, usually high borosilicate glass, which is fired at a high temperature of over 600 degrees Celsius. It is a new type of environmentally friendly tea cup and is increasingly popular among people.