Chemical composition of quartz glass tube

The chemical composition of quartz glass tube is a single component of SiO2, also commonly referred to as purity.


1. Lighting quartz glass tube US GE product Al <14ppm, Ca+Mg total <0.5ppm, Fe<0.2ppm, K+Na+Li total <2ppm, Ti<1ppm, Zr<0.8ppm, base content is divided into Two, <1ppm and <5ppm. Quartz glass for lighting by industry: Al, Ca, Mg, Ti, Fe five elements, superior products <50ppm, first-class products <70ppm, qualified products <1000ppm, base content superior products <3ppm, first-class products <5ppm, qualified Product <10ppm. According to the new information, the desorption is related to the purity of the raw material. The Fe content is required to be <0.3ppm, and the base may be removed to <1ppm. In addition, it is related to the alkali metal content. The alkali metal content is high and easy to remove, but the anti-crystallization property affects the lamp. The service life.
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2. Quartz fused glass for the semiconductor industry The general products of GE Corporation of the United States have the same purity as the lighting products. The base is <10ppm, which can be twice as high as the quartz for illumination. There is also a 244LD brand tube with an Al content of only 8ppm and Li≤0.001ppm. K<0.2ppm, Na≤0.1ppm, total alkali metal <0.3ppm, Zr≤0.3ppm, Ti≤1.4ppm, Ca≤0.6ppm, Mg<0.1ppm, B<0.1ppm, Cu<0.01ppm,P< 0.2 ppm, the purity can be used. The industry of quartz glass for semiconductor industry is: Al, Fe, Ca, Mg, Ti, Na, K, Li, Cu, Co, Ni, Mn, B and other 13 elements total <50ppm, of which Fe≤3ppm, Cu≤ 0.8 ppm, Na ≤ 2 ppm, K ≤ 2 ppm, Li ≤ 2 ppm, B ≤ 0.3 ppm, and base < 220 ppm. From the above comparison, it can be seen that quartz glass fused silica is still very backward in purity and needs to work from various aspects.

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