The manufacturing of glass has a history of 5000 years, and it is generally believed that the earliest creators were ancient Egyptians. During the Eastern Zhou Dynasty, China was able to manufacture glass, which contained lead oxide and barium oxide in its composition, which was significantly different from ancient glass from other countries. In the history of our country, glass has been referred to as "colored glass", "poli", "fake crystal material", "nitrate", and other names.

Glass has a series of very valuable characteristics: transparency, hardness, and good chemical stability; By adjusting the chemical composition, the physical and chemical properties of glass can be greatly adjusted to meet various usage requirements; Various forms of hollow and solid products can be made using various forming methods such as blowing, pressing, pulling, casting, grooving, and centrifugal casting; Devices with complex shapes and strict dimensions can be made through processing methods such as welding and powder sintering. Moreover, the raw materials for manufacturing glass are abundant and affordable. Therefore, as a structural and functional material, glass has been widely used in fields such as building materials, light industry, transportation, medicine, chemical industry, electronics, aerospace, atomic energy, etc.

B270/K9

K9 glass is a glass product made of K9 material, used for optical coating and other fields. K9 material belongs to optical glass, and due to its crystal clear nature, many factories that use K9 material as the processing object have derived. The products they process are called crystal glass products on the market.

The composition of K9 is as follows:

SiO2=69.13% B2O3=10.75% BaO=3.07% Na2O=10.40% K2O=6.29% As2O3=0.36%, its optical constant is: refractive index=1.51630 dispersion=0.00806 Abbe number=64.06.

Colorless optical glass - B270 technical requirements

Grade

thickness

(mm)

λ Tj

(nm)

λ 0

(nm)

T λ 0

(%)

K

B2701-5310 ± 10400 ≥ 89.5 ≥ 1.0

quartz glass

Quartz glass, with its excellent physical and chemical properties, is widely used in semiconductor technology, new electric light sources, production of color TV phosphors, chemical processes, ultra-high voltage dust collection, far-infrared radiation heating equipment, aerospace technology, optical systems for certain weapons and optical instruments, atomic energy technology, refractory materials for float glass and alkali glass cellars, crucibles for special glass, bowls for instrument glass forming parts, ultraviolet sterilization lamps, The production of various non-ferrous metals and many other fields. Quartz glass has a SiO2 content greater than 99.5%, low coefficient of thermal expansion, high temperature resistance, good chemical stability, transparency of ultraviolet and infrared light, high melting temperature, high viscosity, and difficult molding. It is commonly used in technologies such as semiconductors, electric light sources, photoconductive communication, lasers, and optical instruments.

Quartz glass has particularly good transmittance throughout the entire wavelength, and in the infrared region (except for special infrared glass), the spectral transmission range is larger than that of ordinary glass. The transmittance in the visible light region reaches 93%. In the ultraviolet spectral region, especially in the short wave, the transmittance of the ultraviolet spectral region is much better than other glasses. The optical properties of quartz glass largely depend on its chemical properties. Even 0.001% impurities significantly affect product quality. Excessive metal impurities can shift the wavelength direction, and the presence of hydroxyl groups can absorb 2.73 µ m of light band.

There are three brands of domestically produced optical quartz glass: JGS1 ultraviolet optical quartz glass, with an application range of 185-2000nm, manufactured from synthetic stone using Sicl4 as raw material, JGS2 ultraviolet optical quartz glass, with an application range of 220-2500nm, produced using crystal as raw material and gas refining method; JGS3 infrared optical quartz glass, applied in the wavelength range of 260-3500nm, is produced using crystal or high-purity quartz sand as raw materials in a vacuum pressure furnace. There is also a type of full band optical quartz glass abroad, which is applied in the wavelength range of 180-4000nm and produced by plasma (anhydrous and H2 free) chemical phase deposition method. Using ultra-pure Sicl4 as the raw material. Adding a small amount of TiO2 to quartz glass can filter out ultraviolet radiation at 220nm, and is called ozone free quartz glass. Because ultraviolet radiation below 220nm can convert oxygen in the air into ozone, a small amount of elements such as titanium and europium are added to quartz glass. Short waves below 340nm can be filtered out. Using it as an electric light source has a health care effect on human skin. This type of glass can be completely bubble free. It has excellent UV transmittance, especially in the shortwave ultraviolet region, and its transmittance far surpasses all other glasses. The transmittance can reach 85% at 185 µ m. It is an excellent optical material in the 185-2500nm wavelength range. Due to the presence of OH groups in this type of glass, its infrared transmittance is poor, especially with a large absorption peak near 2.7 µ.

Optical properties of quartz glass

(1) Spectral characteristics

The transmission and absorption properties of various colored optical glasses within a specified spectral range are called spectral characteristics. It is made of colored optical glass.

(2) Main characteristics

Quartz glass is the glass with the best UV, visible, and near-infrared performance. You can choose the desired variety from the 168nm-3500nm wavelength range according to your needs.

Brand name: Applied spectral band (nanomicron)

JGS1 Far UV Optical Quartz Glass Application Spectral Band 185-2500nm

JGS2 UV Optical Quartz Glass Application Spectral Band 220-2500nm

JGS3 infrared optical quartz glass application spectral band 260-3500nm

Far ultraviolet optical quartz glass JGS1Reflective glass

Transparent within the UV and visible spectral range; No absorption band in the 185-2500nm wavelength range; There is a strong absorption band in the range of 2600-2800nm; Non luminescent, stable light radiation.

UV optical quartz glass JGS2

Transparent within the UV and visible spectral range; No absorption band in the range of 220-2500nm; There is a strong absorption band in the range of 2600-2800nm; Non luminescent, stable light radiation. UV optical quartz glass: It is an optical quartz glass made by melting advanced crystal powder with a hydrogen oxygen flame. It is a good optical material in the range of 220-2500nm. Its infrared transmittance is the same as that of far ultraviolet quartz glass.

Infrared optical quartz glass JGS3

Transparent within the visible and infrared spectral range; There is no obvious absorption band in the range of 2600-2800nm;

Compared with ordinary silicate glass, transparent quartz glass exhibits excellent transmittance throughout the entire wavelength head. The spectral transmittance in the infrared region is greater than that of ordinary glass; In the visible area, the transmittance of quartz glass is also relatively high. In the ultraviolet spectral region, especially in the shortwave ultraviolet region, the spectral transmittance is much better than other glasses. The spectral transmittance is influenced by three factors: reflection, scattering, and absorption. The reflection of quartz glass is generally 8%, with a larger ultraviolet region and a smaller infrared region. So the transmittance of quartz glass is generally not greater than 92%. The scattering of quartz glass is relatively small and can generally be ignored. Spectral absorption is closely related to the impurity content and production process of quartz glass; The transmittance in the wavelength range below 200 nanometers represents the amount of metal impurities present; The absorption of 240 sodium meters represents the amount of hypoxic structure; The absorption in the visible band is caused by the presence of transition metal ions, and the absorption of 2730 nm is the absorption peak of hydroxyl groups, which can be used to calculate the hydroxyl content.