1. Flat glass
Flat glass refers to flat glass products without other processing, also called white glass or clean glass. According to different production methods, it can be divided into ordinary flat glass and float glass. Flat glass is the most produced and used type of architectural glass. It is mainly used in doors and windows to play the roles of lighting (visible light transmittance 85% to 90%), enclosure, thermal insulation, sound insulation, etc. It is also further processed into other technical glass. of the original film.
Flat glass can be divided into window glass and decorative glass according to its use. According to the national standards "Ordinary Flat Glass" (GB4871-1995) and "Float Glass" (GB11614-89), glass can be divided into the following specifications according to its thickness:
Production by pull method Ordinary flat glass: 2mm, 3mm, 4mm, 5mm four categories.
Float glass: seven categories: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, and 12mm.
The aspect ratio of glass produced by the drawing method shall not be greater than 2.5. The size of 2 and 3 mm thick glass shall not be less than 400 mm × 300 mm, and the size of 4, 5 and 6 mm thick glass shall not be less than 600 mm × 400 mm. The size of float glass is generally not less than 1000mm×1200mm, and the maximum size of 5 and 6mm can be 3000mm×4000mm.
According to national standards, flat glass is graded according to its appearance quality. Ordinary flat glass is divided into three grades: superior product, first-class product and second-class product. Float glass is divided into three grades: superior product, first-class product and qualified product. At the same time, it is stipulated that the curvature of the glass shall not exceed 0.3%.
Ordinary flat glass is measured in standard boxes, actual boxes and weight boxes. For flat glass with a thickness of 2mm, every 10m is 1 standard box; for flat glass with other thickness specifications, standard box conversion is required. The actual box is the unit used for shipping piece pieces. The thickness of the glass is different, and the packaging amount of each actual box is also different. The actual number of standard boxes can be obtained by multiplying the cumulative square number of the same thickness by the thickness coefficient of the actual box. The weight box refers to the weight of each standard box of 2mm thick flat glass. Other thick glass can be converted according to a certain coefficient.
There are two uses for flat glass: 3-5mm flat glass is generally used directly for lighting doors and windows, and 8-12mm flat glass can be used for partitions. Another important use is as the original sheet of tempered, laminated, coated, insulated and other glass.
2. Safety glass
Safety glass refers to glass that has high mechanical strength and strong impact resistance compared with ordinary glass. Its main varieties include tempered glass, wired glass, laminated glass and titanium glass. When safety glass is broken, its fragments will not hurt anyone, and it has the functions of anti-theft and fire prevention. Depending on the original glass used in production, safety glass has a certain decorative effect.
(1) Tempered glass
Tempered glass is also called strengthened glass. It uses physical or chemical methods to form a compressive stress layer on the glass surface. The glass itself has high compressive strength and will not cause damage. When the glass is subjected to external force, this pressure layer can offset part of the tensile stress and prevent the glass from breaking. Although the tempered glass is under a large tensile stress state, there are no defects inside the glass and will not cause damage. , thereby achieving the purpose of improving the strength of glass.
Toughened glass is a secondary processing product of flat glass. The processing of tempered glass can be divided into physical tempering method and chemical tempering method.
Physically tempered glass is also called quenched tempered glass. It heats ordinary flat glass in a heating furnace to close to the softening temperature of the glass (600°C), eliminates internal stress through its own deformation, then moves the glass out of the heating furnace, and then uses a multi-head nozzle to blow high-pressure cold air towards the glass. Tempered glass can be produced by cooling it quickly and evenly to room temperature on both sides. This kind of glass is in a stress state of internal tension and external compression. Once local damage occurs, the stress will be released and the glass will be broken into countless small pieces. These small fragments have no sharp edges and are not easy to hurt people.
Chemical tempered glass improves the strength of the glass by changing the chemical composition of the surface of the glass. Generally, the ion exchange method is used for tempering.
The method is to immerse silicate glass containing alkali metal ions into molten lithium (Li+) salt, so that Na+ or K+ ions on the surface of the glass are exchanged with Li+ ions, and a Li+ ion exchange layer is formed on the surface. Due to the Li+ The expansion coefficient is smaller than Na+ and K+ ions, which causes the outer layer to shrink less and the inner layer to shrink larger during the cooling process. When cooled to normal temperature, the glass is also in a state of tension on the inner layer and pressure on the outer layer. The effect Similar to physically tempered glass.
Toughened glass has high strength, and its compressive strength can reach more than 125MPa, which is 4 to 5 times greater than ordinary glass; its impact strength is also very high. When measured with the steel ball method, a 0.8kg steel ball The glass can remain intact even after being dropped from a height of 1.2m.
The elasticity of tempered glass is much greater than that of ordinary glass. A piece of 1200mm × 350mm × 6mm tempered glass can have a bending deflection of up to 100mm after being stressed. When the external force is removed, it can still return to its original shape. Ordinary glass can only bend a few millimeters.
Good thermal stability and resistance to explosion when subjected to rapid cooling or heating is another characteristic of tempered glass. This is because the compressive stress of tempered glass can offset part of the tensile stress caused by rapid cooling and rapid heating. Tempered glass is resistant to thermal shock, has a maximum safe working temperature of 288°C, and can withstand a temperature difference of 204°C.
Because tempered glass has good mechanical properties and thermal stability, it is widely used in construction engineering, transportation and other fields. Flat tempered glass is commonly used in doors, windows, partitions, curtain walls, showcases, furniture, etc. of buildings, while curved glass is commonly used in cars, trains, and airplanes.
When using, it should be noted that tempered glass cannot be cut or ground, and the corners cannot be bumped or squeezed. It must be selected according to ready-made size specifications or specific design drawings must be submitted for processing and customization. The tempering of glass used for large-area glass curtain walls must be controlled, and semi-tempered glass should be selected, that is, its stress cannot be too large to avoid self-explosion due to vibration caused by wind load.
Depending on the original glass used, it can be made into ordinary tempered glass, heat-absorbing tempered glass, colorful tempered glass, tempered insulating glass, etc.
(2) Wired glass
Wired glass is also called shatterproof glass or steel wire glass. It is produced by the rolling method, that is, preheated steel wire or steel wire mesh is pressed into the middle of the glass in the molten state of the glass, followed by annealing and cutting. The surface of wired glass can be embossed or polished, and the color can be made colorless, transparent or colored.
Wired glass is characterized by good safety and fire resistance. Due to the skeleton effect of the steel mesh, wired glass not only improves the strength of the glass, but also prevents the fragments from flying when it is damaged by impact or sudden changes in temperature, preventing the fragments from harming people. In the event of a fire, when the flame spreads, the wired glass will explode due to heat. Due to the function of the wire mesh, the glass can still remain fixed and isolate the flame, so it is also called fire-proof glass.
According to the national industry standard JC433-91, the thickness of wired glass is divided into: 6, 7, 10mm, and the size is generally not less than 600mm×400mm and not larger than 2000mm×1200mm.
Currently, the wired glass produced in my country is divided into two types: wired embossed glass and wired polished glass. Wired glass can be used for anti-door windows, skylights, lighting roofs, balconies and other parts of buildings.
(3) Laminated glass
Laminated glass is made of PVB (polyvinyl butyraldehyde) resin film between two or more original glass sheets. Flat or curved composite glass products made by pressure bonding. The raw sheets used for laminated glass can be ordinary flat glass, float glass, tempered glass, colored glass, heat-absorbing glass or heat-reflecting glass, etc.
The number of layers of laminated glass is 2, 3, 5, or 7, up to 9 layers. For two-layer laminated glass, the thickness of the original sheet is commonly used (mm): 2+3, 3+3, 3+5 etc. The structure of laminated glass is shown in Figure 8-1.
Laminated glass has good transparency and impact resistance several times higher than ordinary flat glass. It can be made into bulletproof glass by combining multiple layers of ordinary glass or tempered glass. Due to the adhesive effect of PVB film, even if the glass breaks, the fragments will not fly and hurt people. By using different original sheets of glass, laminated glass can also have properties such as durability, heat resistance, and moisture resistance.
Laminated glass has high safety and is generally used in buildings as doors, windows, skylights in high-rise buildings and as showcases and partitions in shops, banks, and jewelry.
(4) Titanium glass
Titanium glass is also called never-breakable iron foil glass. It is a new type of glass that adheres titanium foil film closely to any glass substrate and combines it into one. Titanium glass has high shatter resistance, high heat resistance and UV protection. Different base glass and different titanium foil films can be combined into titanium glass with different colors, different properties, and different specifications. Common colors of titanium glass include: colorless and transparent, brown, brown reflective, copper reflective, etc.
3. Energy-saving glass
Traditional glass applications in buildings are mainly for lighting. As the size of building doors and windows increases, people’s requirements for thermal insulation of doors and windows also increase. Accordingly, energy-saving decorative glass is a glass that can meet this requirement and integrates energy-saving and decorative properties. Energy-saving decorative glass usually has a pleasing appearance and color, and also has special ability to absorb, transmit and reflect light and heat. It can achieve significant energy-saving effects by using the exterior window glass curtain wall of a building. Now it has It is widely used in various high-end buildings. Commonly used energy-saving decorative glasses in buildings include heat-absorbing glass, heat-reflecting glass and insulating glass.
(1) Heat-absorbing glass
Heat-absorbing glass is flat glass that can absorb a large amount of infrared radiation energy and maintain a high visible light transmittance. There are two methods for producing heat-absorbing glass: one is to add a certain amount of colorant with heat-absorbing properties to the raw materials of ordinary soda-lime silicate glass; the other is to spray one or more layers on the surface of flat glass. Made of metal or metal oxide films.
Heat-absorbing glass comes in gray, brown, blue, green, bronze, bronze, pink and golden yellow. Our country currently mainly produces the first three colors of heat-absorbing glass. There are four thicknesses: 2, 3, 5, and 6mm. Heat-absorbing glass can also be further processed into polished, tempered, laminated or insulated glass.
Compared with ordinary flat glass, heat-absorbing glass has the following characteristics:
⒈Absorbs solar radiation heat. For example, the total heat transmitted by 6mm thick transparent float glass under sunlight is 84%, while the total heat transmitted by heat-absorbing glass under the same conditions is 60%. The color and thickness of heat-absorbing glass are different, and the degree of absorption of solar radiation heat is also different.
⒉Absorb visible light from the sun, weaken the intensity of sunlight, and play an anti-glare effect.
⒊It has a certain degree of transparency and can absorb a certain amount of ultraviolet rays.
Due to the above characteristics, heat-absorbing glass has been widely used in doors, windows, exterior walls of buildings, and as windshields for cars and boats, etc., to play the roles of heat insulation, anti-glare, lighting and decoration.
(2) Heat reflective glass
Heat reflective glass is a flat glass with high heat reflection ability and good light transmittance. It is made by pyrolysis method, vacuum Evaporation method, cathode sputtering method, etc., coating the glass surface with metal or metal oxide films such as gold, silver, copper, aluminum, chromium, nickel and iron, or using electroflotation plasma ion exchange method to replace the glass with metal ions The original ions on the surface form a heat reflective film. Heat reflective glass is also called mirror glass and comes in various colors such as gold, brown, gray, purple, brown, bronze and light blue.
The heat reflectivity of heat-reflective glass is high. For example, the total reflected heat of 6mm thick float glass is only 16%. Under the same conditions, the total reflected heat of heat-absorbing glass is 40%, while heat-reflective glass is It can be as high as 61%, so it is often made into insulating glass or laminated glass to increase its thermal insulation performance. The heat-reflective glass coated with metal film also has the function of one-way transmission.
Glass is made of quartz sand, soda ash, feldspar and limestone as the main raw materials, and is formed by melting, shaping, cooling and solidification. Crystalline inorganic materials. It has transparency that is difficult to achieve with ordinary materials, and has excellent mechanical and thermal properties. Moreover, with the needs of the development of modern architecture, it is constantly developing in the direction of multi-function. Deeply processed glass products can have functions such as controlling light, adjusting temperature, preventing noise, and improving architectural art decoration. Glass is no longer just a lighting material, but also a structural and decorative material for modern buildings.
1. Flat glass
Flat glass refers to flat glass products without other processing, also called white glass or clean glass. According to different production methods, it can be divided into ordinary flat glass and float glass.
Flat glass is the most produced and used type of architectural glass. It is mainly used in doors and windows to play the roles of lighting (visible light transmittance 85% to 90%), enclosure, thermal insulation, sound insulation, etc. It is also further processed into other technical glass. of the original film.
Flat glass can be divided into window glass and decorative glass according to its use. According to the national standards "Ordinary Flat Glass" (GB4871-1995) and "Float Glass" (GB11614-89), glass can be divided into the following specifications according to its thickness:
Production by pull method Ordinary flat glass: 2mm, 3mm, 4mm, 5mm four categories.
Float glass: seven categories: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, and 12mm.
The aspect ratio of glass produced by the drawing method shall not be greater than 2.5. The size of 2 and 3 mm thick glass shall not be less than 400 mm × 300 mm, and the size of 4, 5 and 6 mm thick glass shall not be less than 600 mm × 400 mm. The size of float glass is generally not less than 1000mm×1200mm, and the maximum size of 5 and 6mm can be 3000mm×4000mm.
According to national standards, flat glass is graded according to its appearance quality. Ordinary flat glass is divided into three grades: superior product, first-class product and second-class product. Float glass is divided into three grades: superior product, first-class product and qualified product. At the same time, it is stipulated that the curvature of the glass shall not exceed 0.3%.
Ordinary flat glass is measured in standard boxes, actual boxes and weight boxes. For flat glass with a thickness of 2mm, every 10m is 1 standard box; for flat glass with other thickness specifications, standard box conversion is required. The actual box is the unit used for shipping piece pieces. The thickness of the glass is different, and the packaging amount of each actual box is also different. The actual number of standard boxes can be obtained by multiplying the cumulative square number of the same thickness by the thickness coefficient of the actual box. The weight box refers to the weight of each standard box of 2mm thick flat glass. Other thick glass can be converted according to a certain coefficient.
There are two uses for flat glass: 3-5mm flat glass is generally used directly for lighting doors and windows, and 8-12mm flat glass can be used for partitions. Another important use is as the original sheet of tempered, laminated, coated, insulated and other glass.
2. Safety glass
Safety glass refers to glass that has high mechanical strength and strong impact resistance compared with ordinary glass. Its main varieties include tempered glass, wired glass, laminated glass and titanium glass. When safety glass is broken, its fragments will not hurt anyone, and it has the functions of anti-theft and fire prevention. Depending on the original glass used in production, safety glass has a certain decorative effect.
(1) Tempered glass
Tempered glass is also called strengthened glass. It uses physical or chemical methods to form a compressive stress layer on the glass surface. The glass itself has high compressive strength and will not cause damage. When the glass is subjected to external force, this pressure layer can offset part of the tensile stress and prevent the glass from breaking. Although the tempered glass is under a large tensile stress state, there are no defects inside the glass and will not cause damage. , thereby achieving the purpose of improving the strength of glass.
Toughened glass is a secondary processing product of flat glass. The processing of tempered glass can be divided into physical tempering method and chemical tempering method.
Physically tempered glass is also called quenched tempered glass. It heats ordinary flat glass in a heating furnace to close to the softening temperature of the glass (600°C), eliminates internal stress through its own deformation, then moves the glass out of the heating furnace, and then uses a multi-head nozzle to blow high-pressure cold air towards the glass. Tempered glass can be produced by cooling it quickly and evenly to room temperature on both sides. This kind of glass is in a stress state of internal tension and external compression. Once local damage occurs, the stress will be released and the glass will be broken into countless small pieces. These small fragments have no sharp edges and are not easy to hurt people.
Chemical tempered glass improves the strength of the glass by changing the chemical composition of the surface of the glass. Generally, the ion exchange method is used for tempering.
The method is to immerse silicate glass containing alkali metal ions into molten lithium (Li+) salt, so that Na+ or K+ ions on the surface of the glass are exchanged with Li+ ions, and a Li+ ion exchange layer is formed on the surface. Due to the Li+ The expansion coefficient is smaller than Na+ and K+ ions, which causes the outer layer to shrink less and the inner layer to shrink larger during the cooling process. When cooled to normal temperature, the glass is also in a state of tension on the inner layer and pressure on the outer layer. The effect Similar to physically tempered glass.
Toughened glass has high strength, and its compressive strength can reach more than 125MPa, which is 4 to 5 times greater than ordinary glass; its impact strength is also very high. When measured with the steel ball method, a 0.8kg steel ball The glass can remain intact even after being dropped from a height of 1.2m.
The elasticity of tempered glass is much greater than that of ordinary glass. A piece of 1200mm × 350mm × 6mm tempered glass can have a bending deflection of up to 100mm after being stressed. When the external force is removed, it can still return to its original shape. Ordinary glass can only bend a few millimeters.
Good thermal stability and resistance to explosion when subjected to rapid cooling or heating is another characteristic of tempered glass. This is because the compressive stress of tempered glass can offset part of the tensile stress caused by rapid cooling and rapid heating. Tempered glass is resistant to thermal shock, has a maximum safe working temperature of 288°C, and can withstand a temperature difference of 204°C.
Because tempered glass has good mechanical properties and thermal stability, it is widely used in construction engineering, transportation and other fields. Flat tempered glass is commonly used in doors, windows, partitions, curtain walls, showcases, furniture, etc. of buildings, while curved glass is commonly used in cars, trains, and airplanes.
When using, it should be noted that tempered glass cannot be cut or ground, and the corners cannot be bumped or squeezed. It must be selected according to ready-made size specifications or specific design drawings must be submitted for processing and customization. The tempering of glass used for large-area glass curtain walls must be controlled, and semi-tempered glass should be selected, that is, its stress cannot be too large to avoid self-explosion due to vibration caused by wind load.
Depending on the original glass used, it can be made into ordinary tempered glass, heat-absorbing tempered glass, colorful tempered glass, tempered insulating glass, etc.
(3) Wired glass
Wired glass is also called shatterproof glass or steel wire glass. It is produced by the rolling method, that is, preheated steel wire or steel wire mesh is pressed into the middle of the glass in the molten state of the glass, followed by annealing and cutting. The surface of wired glass can be embossed or polished, and the color can be made colorless, transparent or colored.
Wired glass is characterized by good safety and fire resistance. Due to the skeleton effect of the steel wire mesh, wired glass not only improves the strength of the glass, but when it is damaged by impact or sudden changes in temperature, the fragments will not fly away, preventing the fragments from harming people. In the event of a fire, when the flame spreads, the wired glass will explode due to heat. Due to the function of the wire mesh, the glass can still remain fixed and isolate the flame, so it is also called fire-proof glass.
According to the national industry standard JC433-91, the thickness of wired glass is divided into: 6, 7, 10mm, and the size is generally not less than 600mm×400mm and not larger than 2000mm×1200mm.
Currently, the wired glass produced in my country is divided into two types: wired embossed glass and wired polished glass. Wired glass can be used for doors and windows, skylights, lighting roofs, balconies and other parts of buildings.
(3) Laminated glass
Laminated glass is made of PVB (polyvinyl butyraldehyde) resin film between two or more original glass sheets. Flat or curved composite glass products made by pressure bonding. The raw sheets used for laminated glass can be ordinary flat glass, float glass, tempered glass, colored glass, heat-absorbing glass or heat-reflecting glass, etc.
The number of layers of laminated glass is 2, 3, 5, or 7, up to 9 layers. For two-layer laminated glass, the thickness of the original sheet is commonly used (mm): 2+3, 3+3, 3+5 etc. The structure of laminated glass is shown in Figure 8-1.
Laminated glass has good transparency and impact resistance several times higher than ordinary flat glass. It can be made into bulletproof glass by combining multiple layers of ordinary glass or tempered glass. Due to the adhesive effect of PVB film, even if the glass breaks, the fragments will not fly and hurt people. By using different original sheets of glass, laminated glass can also have properties such as durability, heat resistance, and moisture resistance.
Laminated glass has high safety and is generally used in buildings as doors, windows, skylights in high-rise buildings and as showcases and partitions in shops, banks, and jewelry.
(4) Titanium glass
Titanium glass is also called never-breakable iron foil glass. It is a new type of glass that adheres titanium foil film closely to any glass substrate and combines it into one. Titanium glass has high shatter resistance, high heat resistance and UV protection. Different base glass and different titanium foil films can be combined into titanium glass with different colors, different properties, and different specifications. Common colors of titanium glass include: colorless and transparent, brown, brown reflective, copper reflective, etc.
3. Energy-saving glass
Traditional glass applications in buildings are mainly for lighting. As the size of building doors and windows increases, people’s requirements for thermal insulation of doors and windows also increase. Accordingly, energy-saving decorative glass is a glass that can meet this requirement and integrates energy-saving and decorative properties. Energy-saving decorative glass usually has a pleasing appearance and color, and also has special ability to absorb, transmit and reflect light and heat. It can achieve significant energy-saving effects by using the exterior window glass curtain wall of a building. Now it has It is widely used in various high-end buildings. Commonly used energy-saving decorative glasses in buildings include heat-absorbing glass, heat-reflecting glass and insulating glass.
(1) Heat-absorbing glass
Heat-absorbing glass is flat glass that can absorb a large amount of infrared radiation energy and maintain a high visible light transmittance. There are two methods for producing heat-absorbing glass: one is to add a certain amount of colorant with heat-absorbing properties to the raw materials of ordinary soda-lime silicate glass; the other is to spray one or more layers on the surface of flat glass. Made of metal or metal oxide films.
Heat-absorbing glass comes in gray, brown, blue, green, bronze, bronze, pink and golden yellow. Our country currently mainly produces the first three colors of heat-absorbing glass. There are four thicknesses: 2, 3, 5, and 6mm. Heat-absorbing glass can also be further processed into polished, tempered, laminated or insulated glass.
Compared with ordinary flat glass, heat-absorbing glass has the following characteristics:
⒈Absorbs solar radiation heat. For example, the total heat transmitted by 6mm thick transparent float glass under sunlight is 84%, while the total heat transmitted by heat-absorbing glass under the same conditions is 60%. The color and thickness of heat-absorbing glass are different, and the degree of absorption of solar radiation heat is also different.
⒉Absorb visible light from the sun, weaken the intensity of sunlight, and play an anti-glare effect.
⒊It has a certain degree of transparency and can absorb a certain amount of ultraviolet rays.
Due to the above characteristics, heat-absorbing glass has been widely used in doors, windows, exterior walls of buildings, and as windshields for cars and boats, etc., to play the roles of heat insulation, anti-glare, lighting and decoration.
(2) Heat reflective glass
Heat reflective glass is a flat glass with high heat reflection ability and good light transmittance. It is made by pyrolysis method, vacuum Evaporation method, cathode sputtering method, etc., coating the glass surface with metal or metal oxide films such as gold, silver, copper, aluminum, chromium, nickel and iron, or using electroflotation plasma ion exchange method to replace the glass with metal ions The original ions on the surface form a heat reflective film. Heat reflective glass is also called mirror glass and comes in various colors such as gold, brown, gray, purple, brown, bronze and light blue.
The heat reflectivity of heat-reflective glass is high. For example, the total reflected heat of 6mm thick float glass is only 16%. Under the same conditions, the total reflected heat of heat-absorbing glass is 40%, while heat-reflective glass is It can be as high as 61%, so it is often made into insulating glass or laminated glass to increase its thermal insulation performance. The heat-reflective glass coated with metal film also has the function of one-way transmission, that is, the outdoor scene can be seen indoors during the day, but the indoor scene cannot be seen outdoors
Reference: /question/37109054. html?si＝5
Answer: Open the tank quickly - Doorman Level 2 10-13 09:52
New type of glass (text)
Late at night Suddenly, a rapid alarm sounded from a museum displaying precious calligraphy and paintings. The police arrived immediately and caught a suspect who had scratched the glass in an attempt to steal the exhibits. You may not believe that it was not the night guard who called the police, but the scratched glass! This is a special kind of glass with a very fine wire mesh inside. The wire mesh is powered and connected to the automatic alarm.
The suspect cut through the glass and hit the wire mesh, causing the alarm to go off. This kind of glass is called "wire mesh anti-theft glass" and can be used in museums, banks, jewelry stores, and buildings where important drawings and documents are stored.
Another type of "wired glass" is not used to prevent theft. It is very hard and remains unharmed after being hit hard;
Even if it is broken, the fragments will still stick together and will not hurt anyone. Some countries stipulate that high-rise buildings must use this safe and reliable glass.
There is also a kind of "color-changing glass" that can reflect sunlight. When a building is equipped with this kind of glass, the outside can be seen clearly from the inside, but nothing can be seen inside from the outside. Color-changing glass will also change the depth of color according to the intensity of sunlight, adjusting the light in the room. So people call this kind of glass "automatic curtains".
Some people think that it would be great if the glass on the window could make the room warm in winter and cool in summer! Such glass has been around for a long time. It is "heat-absorbing glass". In hot summers, it blocks strong sunlight, making the indoors cooler than outdoors; in cold winters, it blocks the cold air outdoors, keeping the indoors warm.
Noise is like an "invisible man" that comes and goes without a trace, unlike smoke and wastewater that can be concentrated and processed. Although this "invisible man" is difficult to deal with, people have come up with many ways to subdue him. "Sound-eating glass" is an expert in eliminating noise. If this kind of glass is installed on the windows facing the street, when the sound from the street is 40 decibels, only 12 decibels will be transmitted to the room.
In modern buildings, new types of glass are playing an important role; in the development of new types of glass, people will create more miracles.
Answer: Smurf Flash - Trial Period Level 10-13 10:31
New Type of Glass
It is late at night, an exhibition displaying precious calligraphy and paintings Suddenly, a rapid alarm sounded in the museum. The police arrived immediately, and a suspect who slashed the glass in an attempt to steal the exhibits was arrested. You may not believe that it was not the duty officer who called the police, but the scratched glass! This is a special kind of glass with a layer of metal mesh inside. The mesh is connected to the power supply and connected to the automatic alarm. When a criminal suspect scratches the glass and touches the wire mesh, the alarm device will sound an automatic alarm. This kind of glass is called "wire mesh anti-theft glass". It has a wide range of uses and can be used in banks and buildings where cultural relics, jewelry, important drawings, and documents are stored.
There is also a kind of "wired glass". Although it is not used to prevent theft, it is indispensable in high-rise buildings. This wired glass is so strong that it survived being hit with a hundred pound sandbag. Even if there is a greater impact, even if the glass is broken, the fragments will still stick together and will not hurt anyone. Because of its safety and reliability, some countries stipulate that this kind of wired glass must be used in high-rise buildings.
There is also a kind of "color-changing glass" that can reflect sunlight. When a building is equipped with this kind of glass, the outside can be seen clearly from the inside, but nothing can be seen when looking inside from the outside. Color-changing glass also changes color with the intensity of sunlight, automatically adjusting the internal light, so people call this kind of glass "automatic curtains."
Some people think that it would be great if there was a kind of glass that could make the room warm in winter and cool in summer! In fact, such glass has been around for a long time. This is "heat-absorbing glass". In hot summers, heat-absorbing glass can block strong sunlight, making the indoors cooler than outdoors; in cold winters, it blocks the cold air outdoors, keeping the indoors warm.
Noise is like an "invisible man" that comes and goes without a trace. It cannot be concentrated and treated like smoke and wastewater. Although this "invisible man" is difficult to deal with, people have come up with many ways to subdue him. "Sound-eating glass" is an expert in eliminating noise. If this kind of glass is installed on a building facing the street in a downtown area, the noise from the street will be transmitted into the room and it will be greatly reduced.
In modern buildings, new types of glass are playing an important role. With the development of science and technology, new types of glass will create more miracles.