Material Properties:
| Density (at 25°C / 77°F) | 2.201 g/cm^3 |
| Shear Modulus | 30.6 GPa |
| Young's Modulus | 2.1 GPa |
| Bulk Modulus | 37.4 GPa |
| Modulus of Rupture, abraded | 52.4 MPa |
| Poisson's Ratio | 0.179 |
| Knoop Hardness (100g load) | 522 kg/mm^2 |
| Compressive Strength | 1.14 GPa |
| Tensile Strength | 54 MPa |
| Strain Point | 893°C/1639.4°F |
| Thermal Expansion Coefficients | 0.52 ppm/K @5-35°C 0.57 ppm/K @0-200°C 0.48 ppm/K @-100 - 200°C |
| Annealing Point | 1042°C/1907.6°F |
| Softening Point | 1585°C/2885°F |
| Thermal Conductivity | 1.38 W/m·K |
| Thermal Diffusivity | 0.0075 cm^2/s |
| Specific Heat | 0.770 J/g·K |
| Refractive Index | Nd = 1.45840 @589nm |
| Dielectric Constant | E = 3.8 |
Note: The parameters presented here are representative of commercially available Fused Silica and are offered for references only. Please view the data sheets of the brands if you want to check the individual properties of each brand.
Specifications:
| Brands and Materials: | Corning :Fused silica 7980/7978/7979 etc. Made in China: Fused Silica JGS1, Single Crystal Quartz, etc. |
| Diameters | Up to 450mm(4inch/6inch/8inch/12inch/350mm/450mm) |
| Thickness | Minimum 30μm(0.1mm/0.2mm/0.3mm/0.5mm/1mm etc) |
| Dimensional Tolerance | +/- 0.2mm |
| Thickness Tolerance | +/- 0.1mm |
| Thickness Variation(TTV) | < 2μm |
| Surface Roughness (Rz) | < 0.05μm |
| Surface Quality | 40/20 S/D, or custom |
| Bow/Warp | <20μm |
| Other customized specifications available | |
Fused Silica and Optical Quartz Glass Wafers or Substrates are thin discs or square plates of variable dimensions or shapes made from Fused Silica or Quartz Glass. The terms Fused Silica, or Quartz Glass (sometimes also called Fused Quartz) describe transparent solids composed of refined silica Silicon Dioxide (SiO2) in amorphous form gained through the rapid cooling of molten Silica to prevent the formation of crystalline structure. ( It is worth noting that the term "SiO2 Wafers or Substrates" could be interpreted both as wafers made from non-crystalline quartz glass and wafers made from single-crystal quartz.) In comparison with quartz crystal, which has an anisotropic crystalline structure and hence being birefringent, quartz glass is amorphous, and therefore it is isotropic, this implies the absence of birefringence in fuse silica glass.
There are two kinds of Fused Silica or Quartz Glass, IR Grade Fused Silica and UV Grade Fused Silica. IR Grade Fused Silica refers to the material produced with a production method to reduce OH composition, increasing the transmission in the IR band. One measure to realize this is Chemical Vapor Deposition (CVD), where silicon-rich precursors (e.g. SiliconTetra Chloride, SiCl4) are heated into vapor, then oxidized, and obtain the deposition. While UV Grade Fused Silica is produced by fusing SiCl4 stones with flame, therefore containing a higher OH composition than IR Grade Fused Silica, which leads to an absorption band in the infrared spectral region, but a greater transmission rate to ultraviolet radiation than the former.
In general, the family of SiO2 glass variants exhibits a set of unique benefits that make them indispensable in the fabrication of high-tech products. First, it has exceptional thermal properties, with a high melting point of approx. 1650°C, quartz glass will not deform at temperatures <1400°C, with the additional virtue of low thermal expansion, and excellent thermal shock resistance. Second, Fused Silica glass is hard and robust, but not too difficult to machine and polish. Other advantages of Fused Silica and Optical Quartz Glass include wide optical transmission (about 0.18 μm to 3 μm, covering the UV, VIS, and IR spectra), chemical inertia (it can endure almost all sorts of chemical attacks except strong alkaline or HCl), radiation resistance, low refractive indices, and low chromatic dispersion, etc. The application fields of fused silica glass are wide, encompassing optical and laser systems, UV-light sanitation, semiconductors, spacecraft, etc.
Hangzhou Shalom EO offers Fused Silica and Optical Quartz Glass Wafers or Substrates made from glass materials equivalent to the brands stated: Corning HPFS 7980/7979/7978, JGS1(Optical Quartz Glass). Large-size wafers and substrates are available with a maximum diameter of 450mm and smooth surfaces with surface roughness of < 5 Å. All the specifications could be customized at your request.
Shalom EO is capable of providing Fused Silica and Optical Quartz Glass Wafers (or Substrates) suitable for applications listed below:
Features of brands:
Corning HPFS 7980/7979/7978:
Corning HPFS (High Purity Fused Silica) glass features low dispersion constants, splendid homogeneity grades, exceptional transparency across the UV, VIS, and IR zones, and an ultra-low thermal expansion coefficient. While Corning 7980 UV Fused Silica performs great in the UV spectrum, Corning 7979 IR grade glass in general has lower metallic and OH contents resulting in higher transmission during the MWIR zone. Corning 7978 is also a kind of IR-grade glass. Wafers and substrates made from Corning HPFS 7980/7979/7978 are particularly suitable for processing high-end optical components including Optical Lenses, Optical Windows, Optical Mirrors, etc.
Datasheet of Corning HPFS 7980 and 7979
JGS1:JGS1 is an Optical Quartz Glass renowned for its UV-transparent characteristic, produced via melting SiCl4 stones with high-purity HHO flame and cooling the melted substance.
Being an ideal Chinese substitute for Corning 7980 UV grade Fused Silica, it has excellent mechanical, thermal, and chemical endurance, and is suitable for applications in the wavelength range from 180nm to 2500nm, where the average transmission through UV and VIS spectrum is 90% and gets even higher when extended to the further UV range below 185nm. However, Due to its production method, a large amount of OH of approx. 2000pm are embedded, which results in dips on the transmission curve at 1400nm, and 2200nm, and a strong absorption peak at 2700nm.
JGS1 provided by Shalom EO is similar to Heraeus Suprasil 1 and 2, Saint-Gobain Spectrosil A and B, Corning 7980, Dynasil’s 1100 and 4100.
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