How to determine the quality of the glass you buy? These 5 points are important
Usually, when we buy water cups, the glass will be preferred by many people. For one thing, the glass material performance is stable, will not precipitate harmful substances, and will not chemically react with drinks, and secondly, the glass surface is smooth and easy to clean. The price of glass cups from a few, dozens to hundreds or even thousands are available, where do they differ? How can we determine the quality of the glass we buy? The following 5 points may help you effectively identify.
1. Look at the material
The more common on the market, in line with safety standards of glass materials, generally including ordinary soda-lime glass, high borosilicate glass, crystal glass, etc… In the cup box or certificate of conformity to view the specific materials.
Soda-lime glass temperature difference resistance performance is more general, be sure to confirm the heat-resistant range before use. High borosilicate glass is pure and translucent, its coefficient of thermal expansion is only one-third of the ordinary glass cups, can withstand sudden changes in the instantaneous temperature difference, is recognized as a safe glass material. Crystal glass is mostly used in tall glasses, there are lead crystal glass and lead-free crystal glass, the former is harmful to humans! The latter lightly bouncing the glass makes a pleasant sound, and the color is brighter and more transparent.
2. Look at the purity
If the glass material is not pure, the glass drinking utensils will appear on the streaks, small bubbles, impurities precipitation.
Stripes – the surface of the glass coarse lines can be felt when touched by hand, fine lines need to be seen against the light. “Small bubbles” – small cavities formed in the glass due to the air wrapped around it. According to the formation of the reason can be divided into material bubble and operation bubble. “Operation bubble” generally appears on the surface of the glass, “material bubble” is hidden in a deeper place. According to the national QB/5035-2017 “double glass mouth cup” industry standard, the cup body is not allowed to have bubbles, but the diameter and number of bubbles have strict requirements. 0.5mm ≤ diameter ≤ 1.5mm, there can be a, 3 and dense together bubbles should not. Impurity precipitation – there is no molten white granular silica sand or other granular impurities within the glass. Due to the different expansion coefficients of sand and glass, a slight collision, or because of temperature changes, it may be disconnected from the glass body, resulting in glass cracking.
3. See whether the standard modeling
The phenomenon of non-standard modeling has the following categories: 1, the surface of the glass body is not smooth. 2, the drinking utensils to the light observation, there are cracks, marks, etc. 3, the geometry is not correct, the round is not round, the flat is not flat, the straight is not straight. If the glass is not shaped, the mouth and bottom of the cup should be a regular, horizontal positive circle. Glass products are not standard, not only affect the beauty, and are easy to damage.
4. Look at the cup thickness is uniform
The cup will be observed against the light, if the light in all parts of the consistent, integrated, it means that the thickness is consistent; if the difference between light and dark is too large, it means that the thickness is not consistent. Cup too thick, the heat transfer is slow, easy to crack; cup too thin, the strength is low, not strong. The bottom of the general cup will be slightly thicker, with four walls than the bottom is slightly thinner.
5. Finally, look at the cup processing accuracy
The above 5 points are met, then the quality of the cup is basically passed. On this basis, some of the details of the design are to enhance the user experience, to really test the skills and patience of the producer, and also whether a brand is really the pursuit of good products. After all, the polishing of the details, time, labor, and material costs will increase.