Applications and characteristics of JGS1 quartz glass

Electric light sources are a field that consumes a large amount of JGS1 quartz glass. Today, with the rapid development of energy-saving light sources, halogen lamps are being promoted and applied domestically and internationally, thus creating a surprising demand for JGS1 quartz glass. Currently, there are more than 100 continuous melting furnaces in China, with a production of 18,000 tons in 2004, including 15,000 tons of transparent tubes and 3,500 tons of opal tubes, with sales revenue of nearly 410 million yuan. The quality of germicidal lamp tubes, low-hydroxyl lamp tubes, ozone-free JGS1 quartz glass, and timely halogen heating lamp tubes has reached the level of GE's 214A type, and has already occupied a position in the international market.

　　JGS1 quartz glass deposition tubes are structural materials for optical fibers, accounting for more than 90% of optical fiber components. Their quality directly affects the transmission performance and strength of optical fibers. In 2004, China produced 20 tons of optical fiber timely sleeves and about 120 tons of optical fiber auxiliary timely rods, with an industrial output value of nearly 60 million yuan. The output of timely and timely laser technology and optical fibers for the national defense industry is about 50,000 to 80,000 tons, with an output value of 30 million yuan.

　　Compared with ordinary glass, the performance of JGS1 quartz glass has been greatly improved, with a high transmittance of 80%-90% for all ultraviolet bands. Therefore, most germicidal lamps are made of JGS1 quartz glass. However, due to the different thermal expansion coefficients, germicidal lamps generally cannot be sealed with aluminum cap lamp holders; their lamp holders are mainly made of Bakelite, plastic, or ceramic.

　　In addition, ultraviolet germicidal lamps mainly have two emission lines: 254 nm and 185 nm. The 254 nm ultraviolet light can kill bacteria by irradiating the DNA of microorganisms, while the 185 nm ultraviolet light can convert O2 in the air into O3. Ozone has a strong oxidizing effect and can effectively kill bacteria, compensating for the shortcomings of ultraviolet light only being able to propagate linearly, resulting in disinfection blind spots. When refining JGS1 quartz glass, if a sufficient amount of titanium (Ti) element is added, its ultraviolet light can be cut off below 200 nm, but the 254 nm ultraviolet light is basically unaffected. Therefore, by properly controlling the addition of titanium elements, it is possible to effectively control the escape of 185 nm ultraviolet light, producing three types of ultraviolet sterilization lamps: low ozone (ozone-free), ozone, and high ozone.

　　Due to different costs and uses, some people actually use high borosilicate glass tubes with ultraviolet transmittance below 50% to replace JGS1 quartz glass. However, after reducing the cost, the performance is also reduced. It has been reported that the ultraviolet intensity of high borosilicate tubes is easily attenuated, and the ultraviolet intensity decreases to 50%-70% of the initial value after hundreds of hours of illumination. However, after lighting for 2000-3000 hours, the ultraviolet intensity of the timely lamp tubes only decreases to 80%-70% of the initial value, and the light attenuation is far less than that of high borosilicate lamps.

　　Although JGS1 quartz glass has a higher cost due to its special process and manufacturing difficulty, to some extent, it limits its promotion and application. However, in the application of this part of ultraviolet disinfection lamp tubes, it can be said that only JGS1 quartz glass is capable. Considering that the current epidemic is far from over, and people's awareness of disinfection and sterilization has greatly increased, it is believed that this market will have growth opportunities.