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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.

What is high borosilicate glass and what are its advantages?

High borosilicate heat-resistant glass is an excellent anticorrosion material. Compared with regular glass, the molecular structure of high borosilicate glass is more compact, and it only needs a small thickness to achieve good earthquake resistance and shatterproof effect strength. High borosilicate heat-resistant glass products usually have a wall thickness of about 1.1mm. They feel light and durable. High borosilicate glass takes borosilicate acid as raw material, and the instantaneous temperature difference is -20°C -150°C. High borosilicate glass has the characteristics of high strength, high temperature resistance, impact resistance, corrosion resistance, temperature change resistance, high transparency, no self-explosion and so on. High borosilicate glass with acid and alkali resistance, strong water resistance, high hardness, friction resistance, easy to clean, not easy to leave stains, does not contain harmful substances to human body and many other advantages close to daily life.

What is the difference between high borosilicate glass and regular glass?

1. High borosilicate glass has low thermal expansion.

High borosilicate glass has a very low thermal expansion coefficient, which is about one-third of that of regular glass. This will reduce the impact caused by temperature gradient stress, and thus has stronger fracture resistance. Because of its very small shape deviation, this makes It has become an indispensable material in telescopes and mirrors. It can also be used to process high-level nuclear waste.

2. High borosilicate glass has little broken damage.

Although it is more resistant to thermal shock than other types of glass, high borosilicate glass can still be broken due to rapid or uneven temperature changes or movement. But when it is broken, the cracks of high borosilicate glass are often larger, rather than crushed. In order to prevent glass products from being damaged when moving, we have to choose the best packaging way.

3. High borosilicate glass is mostly used in heat-resistant equipment.

High borosilicate glass is mostly used for reflective heat-resistant lamp cups of halogen lamps and electrical equipment that must use heat-resistant glass, such as special glass turntables for microwave ovens, microwave oven lampshades, stage lighting reflectors, observation windows for drum washing machines, heat-resistant tea cups and Solar collector tubes.

How to verify whether the glass cup is made of high borosilicate glass?

  1. You can put the cup in the refrigerator for 24 hours and then pour it with 100°C hot water. If it bursts, it must not be high borosilicate glass.
  2. High borosilicate glass has better transparency, more delicate body and smoother hand feeling.

Is high borosilicate glass safe or toxic?

Like regular glass, high borosilicate glass is completely non-toxic. Food and drinks in borosilicate containers generally taste better because the material doesn't leach out like plastic bottles and other BPA-containing packaging.

Is high borosilicate glass durable?

High borosilicate glass has excellent durability. In fact, that makes it so popular and famous.

High borosilicate glass should be manufactured at a higher temperature than regular soda lime glass. Higher manufacturing temperatures give it that heat resistance. More heat is needed to change the chemical structure of the glass.

Is high borosilicate glass BPA free?

High borosilicate glass itself does not contain BPA. However, some products that use borosilicate may have other components made from BPA plastic. When choosing borosilicate products, check the chemical composition of any plastic products. All pure high borosilicate glass products (such as baking pans) are 100% BPA free.

Is high borosilicate glass safe to drink?

High borosilicate glass is safe to drink, just like regular glass. High borosilicate glass can help you improve sustainability and keep plastic waste out of landfills, which is good news for the environment. Plastic pollution is a major problem, so using reusable kettles or bottles made of high borosilicate glass can help a lot.

Is high borosilicate glass worth the price?

For most people, high borosilicate glass is worth the extra money. As discussed, you get many benefits, but few drawbacks. It is very durable and has stood the test of time, while preventing any nasty chemicals from seeping into crystal-clear drinking water. It is reusable and recyclable.

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