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The thick glass and thin glass,which is good?

    Some glass is very thick, it will burst when is into the boiling water; others thin glass, into the boiling water is safe. Why thick glass is more easy to Burst, thin-walled glass is not easy to burst? The common glass there are two type: one is the hot cup, one is cold pregnant (like beer mug). Due to different purposes, two formulations and properties of the glass material is not the same.
    There is a performance of the glass, called heat resistance that can withstand rapid temperature changes without cracking performance. Should be able to withstand hot cup 951The temperature difference between the upheaval rather than burst, for example, was originally5 ° CGlass, into100 ° C,the water should not burst. When the glass in-201 - 30X: Under the conditions (such as the province of winter outdoor), very suddenly into the boiling water is easy to burst. This is not a bad description of the quality glass, but the user does not take into account the thermal properties of the glass. Glass with the same kind of raw material, the thinner the more difficult to burst, because the boiling water into the glass at the moment, by the strong expansion of the inner and the outer layer is still cool,This results in a temperature difference, the temperature difference is the result of thermal stress, when the stress exceeds the strength of the glass tumbler will burst. Thin-walled inner heat will soon spread to the outer layer of the glass, the glass will be uniform throughout the expansion, so it is not easy to burst it.
    Glass has two drawbacks: First, drastic changes in temperature intolerance, second is bump. To improve the heat resistance temperature of hot cups difference obtained had thinner. Cold cup heat temperature difference45 ° CSo we must consider the mechanical strength appropriate to make a cup of thick glass durable. Thus, cold drink cups with thick as well.
    From the manufacturing process to see, 'thin blown glass, pressed glass is thicker; former is hot cups, cold cups latter. After the market also sells a hardened tempered glass cup thick. Its heat resistance, can withstand232 ° CThe temperature changes without cracking and not fried. At the same mechanical strength, chemical stability are superior to ordinary glass tumbler,'Can be tossed on the concrete floor, known as afraid to throw the glass.