Quartz glass is the basic material for the production of optical fiber because it has good UV transmission performance and very low absorption of visible light and near-infrared light. Besides the thermal expansion coefficient of quartz glass is extremely small. Its chemical stability is good, and the bubbles, stripes, uniformity and birefringence are comparable to those of ordinary optical glass. It is the best optical material under the harsh environment.

ZMSH uses only high quality, pure quartz glass in the manufacture of its infrared heaters. Quartz glass offers a number of important and critical benefits necessary for effective, efficient process heating:

  • high transmission of infrared radiation
  • high resistance to thermal shock
  • excellent high temperature properties
  • low thermal expansion
  • chemical purity
  • chemical resistance
  • low hysteresis (lag in response time)
  • Fused silicia thermal
  • The graph illustrates thermal data for fused silica (quartz glass). The red line represents change in length of a 1m long rod composed of transparent fused silica, as a function of temperature.
  • Maximum working temperature, continuous: 1100 °C
  • Maximum working temperature, short term: 1300 °C
  • Softening point: 1730 °C



Classification by optical properties:

1. (Far UV Optical Quartz Glass) JGS1
It is an optical quartz glass made of synthetic stone with SiCl 4 as raw material and melted by high purity oxyhydrogen flame. So it contains a large amount of hydroxyl (around 2000 ppm) and has excellent UV transmission performance. Especially in the short wave UV region, its transmission performance is far better than all other kinds of glass. The UV transmission rate at 185nm can reach 90% or more. The synthetic quartz glass get very strong absorption peak at 2730 nm and has no particle structure. It is an excellent optical material in the range of 185-2500nm.

2. (UV Optical Quartz Glass) JGS2
It is quartz glass produced by gas refining with crystal as raw material, containing dozens of PPM metal impurities. There are absorption peaks (hydroxyl content 100-200ppm) at 2730nm, with stripe and particle structure. It is a good material in the wave band range of 220-2500 nm.

3. (Infrared Optical Quartz Glass) JGS3
It is a kind of quartz glass produced by vacuum pressure furnace (i.e. electrofusion method) with crystal or high-purity quartz sand as raw material which contains dozens of PPM metal impurities. But it has small bubbles, particle structure and fringes, almost no OH, and has high infrared transmittance. Its transmittance is over 85%. Its application range is 260-3500 nm optical materials.