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Some knowledge you don't know about glass

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Glass is an amorphous inorganic non-metallic material. It is generally made of a variety of inorganic minerals (such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda ash, etc.) as the main raw material, and a small amount of auxiliary raw materials are added. of. Its main components are silicon dioxide and other oxides.

What are the main glass materials?

1.Soda lime glass

The glass cups and bowls used daily are made of this material, which is not resistant to high temperature, easy to explode, and has poor permeability. It is characterized by small rapid temperature difference and is commonly used in canned bottles. Its important components are silicon dioxide, sodium oxide, and calcium oxide. This kind of water cup is made by mechanism and manual blowing, low price, and daily necessities. If soda-lime glassware is used for drinking hot drinks, it usually needs to be tempered when leaving the factory, otherwise the cup will crack if the temperature difference is too large. For example, if boiling water is poured into a glass just taken out of the refrigerator compartment, it is likely to burst. In addition, it is not recommended to heat soda lime glass products in a microwave oven, because there are also certain safety risks.

2.Borosilicate glass

This material is heat-resistant glass, and glass crisper sets commonly found in the market are made of it. It is characterized by good chemical stability, high strength, and the sudden temperature difference can be greater than 110°C.How is borosilicate glass better than regular glass?High borosilicate does not contain toxic substances, and its high temperature resistance and acid resistance make it difficult for high borosilicate to precipitate substances harmful to the human body in daily drinking water use. The production process of high borosilicate glass material is complicated, and the output of manual production is low.

3.Microcrystalline glass

This kind of material is also called super heat-resistant glass, and the glass pots that are very popular on the market are made of this material. Its characteristic is that the heat resistance is particularly good, the sudden change temperature difference is 400°C.

4.Lead crystal glass

It is usually called crystal glass, which is generally used to make goblet. This kind of glass has high transparency and refractive index, and its appearance is smooth and crystal clear, so it is called crystal glass. It is characterized by good refraction, good hand feeling, and a clear and pleasant sound when tapped.

5.Tempered glass

Tempered glass belongs to safety glass. Tempered glass is actually a kind of prestressed glass. In order to improve the strength of glass, chemical or physical methods are usually used to form compressive stress on the glass surface. When the glass is subjected to external force, the surface stress is first offset, thereby improving the bearing capacity and enhancing the resistance of the glass itself. Wind pressure, cold and heat, shock, etc.

What are the methods of making daily glassware?

1.Blow molding

Blow molding adopts compressed air or manual mouth-blowing method to form the glass liquid into a certain product shape in the mold, including mechanical blow molding and manual blow molding, such as goblet, drinking utensils.

2.Press molding

Compression molding presses the molten glass into a certain product shape in the mold under the action of mechanical force. Press-formed glass products are divided into two methods: mechanical pressing and manual pressing.

3.Centrifugal casting

Centrifugal casting molding: Pour the molten glass into the mold, and the mold rotates at a high speed to make the molten glass evenly fill the mold to form.

4.Free forming

Free forming generally does not require molds to form. Manually blow, pull, pinch, stick, roll and other methods to manually shape into certain product shapes, such as kiln glass vases and furnishings.

Why do small bubbles appear in the glass?

1. The water vapor generated when the water contained in the glass is evaporated at high temperature.

2. Air and water vapor mixed in the glass feed.

3. Gas produced by the decomposition of glass products.

4. The air in the glass feeding system and cavity.

5. Gas produced by volatilization or chemical reaction of certain additives during glass production.

Why does glassware crack when there is a large temperature difference between hot and cold?

Glass is a poor conductor and brittle. When the temperature difference between the inside and the outside of a glassware is too great, the expansion between the inside and the outside will not be uniform. For example, if you pour boiling water into a cold glass bottle, the circumference of the inside of the bottle will increase, but the temperature of the outside glass will not rise to the same as the inside of the bottle, so the outside circumference will not grow, and the glass inside the bottle will be cracked.

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