How the glass is not scalded by boiling water

The glass will be scalded by boiling water and the cause of the breakage is analyzed.

First of all, not all glasses will burst when exposed to hot water. But why do some glasses break?

In the past, when buying a glass, the salesperson would tell you whether it was a hot water cup or a cold water cup. The cold water cup is the one that will burst when it encounters hot water; And hot water cups will not. But the glasses I'm in now should all be hot water cups.

Especially in China, we all use glasses to make tea, so it's not a good thing that the glass can't touch the hot water. The maximum temperature of water at one atmospheric pressure is 100 degrees Celsius, and in our daily life, we will not have more than 100 degrees of water.

If thermal expansion and contraction were the only reason, all glasses should have burst when exposed to piping hot water. This is not the case.

Therefore, heat expansion and cold contraction is part of the truth, in the process of manufacturing glasses, there is no proper treatment, and the glass is not manufactured correctly, which is also a very important reason. As long as the heat expansion coefficient of the glass is relatively small, and the heat transfer coefficient is relatively large, so that the glass will not break. If you can temper the glass, it won't break.

According to the process of the modern glass industry, the glass that will break when exposed to hot water is a manufacturing problem, not a can't.

Start by taking a small basin and placing the glass in the basin. Add an appropriate amount of water to the basin, and the height of the water should be one or two centimeters lower than that of the glass. This way, even if you add hot water to the glass, the glass will not crack.

Put the glass in water and boil for 10 minutes; When pouring water, you can put a little hot water to rinse the cup, and then the hot water will not burst; You can also put a spoon in the cup, and the cup will not break when you pour hot water.

Preheat, when pouring water, you can put a little hot water to rinse the cup, and then the hot water will not burst; You can also put a spoon in the cup, and the cup will not break when you pour hot water.

Simply wash the glass with water and blanch it with boiling water. Confirm the glass material before using hot water to avoid accidental breakage. After washing, pour boiling water along the wall of the cup, just a little at first, then shake well, wait for the temperature of the glass to rise slowly, and then pour a large amount of boiling water for cleaning and disinfection.

The nature of glass is fragile. If you use cold water and then hot water, the glass can easily shatter and may hurt people. Glass can be divided into cold water cups and hot water cups.

Generally, hot water cups are mainly used to drink hot water, which can withstand high temperatures. Cold water cups should only be used to drink cryogenic liquids. Cold water cups should not be scalded with boiling water, as they are easy to burst.

Newly bought glass should be simply disinfected and scalded with boiling water. 84 disinfectant can be used if necessary, but be sure to wash it clean at the end. New cups usually have some flavor. We can put some orange peel or lemon, which can effectively remove the flavor and make the taste fresh.

How to clean a new cup when you buy a new one:

1. Liquor. Blanch with hot 60-degree liquor, then make strong tea; Put it in the microwave, 400 watts for 10 minutes, let it cool naturally, and pour it out for 24 hours; The smell of the cup is completely gone, and it can be cleaned cleanly.

2. Brewed tea leaves. Rub it with soaked tea leaves, and the effect is equally significant.

3. Vinegar. Put the cup into a pot of cold water and add some vinegar, it is best to brew vinegar, boil on the heat, the water should not pass the cup, add one or two to two taels of vinegar, boil until boiling, and then cook for 20 minutes. Be sure to cook it in a pot under cold water, which can not only remove lead but also prevent cracking.

Generally, newly bought ceramic cups will not crack. It is better not to buy those with bright colors, those colored ceramics contain lead, which is inside the pigment.

Glasses can be boiled with boiling water. Glass has the characteristics of corrosion resistance and high temperature resistance, and the appearance of the glass is beautiful and easy to clean, when you feel that the cup is dirty, you can put the glass in boiling water and boil for 5-10 minutes, like this to take the boiled glass can play a role in sterilization, and can be kept for 1-2 days after cooking, which is very convenient and fast.

Precautions for boiling glasses with boiling waterBefore filling the boiling water, put a little hot water to wash the glass, and then pour the hot water so that it will not burst. Put a spoon When pouring boiling water, you can put an iron spoon or a small stainless steel spoon in the cup, and then slowly pour the boiling water into the cup. So that the cup doesn't burst.

Boiling water distributes a portion of the heat to the metal teaspoon of the good conductor, so the temperature of the boiling water decreases, and it changes from boiling water to hot water, which does not interfere with the glass.

Newly purchased glasses, whether single or double, can be boiled and sterilized at high temperatures.

Boiling water does not cause the glass to deform. Because a glass refers to a cup made of glass, usually made of the raw material borosilicate glass.

It is fired at a high temperature of more than 600 degrees. And the temperature at which the water boils is only 100 degrees Celsius.

The forging temperature is much lower than that of the glass, which does not destroy the stability of the cup and does not cause the cup to deform.

Maintenance of glasses:

1. It is best to clean the glass cup immediately after each use, if you feel that it is too troublesome, it should be cleaned at least once a day, you can wash it before going to bed at night, and then dry it.

2. When cleaning the cup, not only the mouth of the cup should be cleaned, but also the bottom and wall of the cup should not be ignored, especially the bottom of the cup, which is not often cleaned, and may precipitate a lot of bacteria and dirt.

3. It is necessary to clean a lot of greasy, dirt or tea dirt.

You can squeeze toothpaste on the brush and rub it back and forth inside the cup. Since the toothpaste contains both a stain remover and a very fine friction agent, it is easy to wipe off the residue without damaging the cup.

4. If there is tea dirt in the cup and cannot be removed, you can soak the cup in diluted sour vinegar for about half an hour, and then clean it, so that it can be as shiny as new.

The newly bought glass can be scalded with hot water. The new glass can also be boiled with boiling water for a while to achieve the purpose of disinfection and sterilization, and the glass that has been scalded in boiling water is not easy to burst, but before using boiling water, you need to determine whether the material of the glass is suitable for scalding with boiling water, so as not to damage the cup.

When scalding the glass, you need to do it slowly, first add a little boiling water to the cup, shake it evenly, and wait until the glass is used to the high temperature, and then pour a large amount of boiling water to rinse. When buying glasses, choose clean, transparent and complete, and do not buy glasses with bubbles, impurities or cracks on the wall of the cup, so as not to burst after injecting hot water and affect the use.

Glasses can be boiled with boiling water. Generally, glasses that can hold boiling water can be boiled with boiling water, but it is recommended to put the cup in the cup when the water is boiling and wait until the water is boiled with the cup. You can also put a cloth under the glass to avoid direct contact between the bottom of the glass and the bottom of the high-temperature pot, try to burn it on low heat at the beginning, and then heat it slowly to avoid sudden cold or hot water.