Optical Properties: Refractive index (λ in µm) The average CTE value for quartz glass at about 5.0 × 10 -7 / °C is many times lower than that of other common materials. range from 0°C to 80°C. Download Silestone technical documentation: technical datasheets by color, certificates, comparatives with marble, natural stone or solid surfaces This is due to its very high purity. Crystal quartz is a very useful material for fabrication of finished optics: laser beamsplitters, AO elements, polarizing optics, prisms, windows, lenses in the ultraviolet because of its high UV, VIS and NIR transmittance. Fused Silica is used for viewing windows, being transparent to … Lenses made of silica glass and fixed in a rigid apparatus do not get distorted by changes in temperature. Quartz is mined naturally, but more commonly produced synthetically in large, long-faceted crystals. A recommended best set of values was received, as were third-, and fourth-, and fifth-order power series expansions for the coefficients of thermal linear expansion … The optical and thermal properties of fused quartz is far superior to those of other types of glass. To put this in perspective, imagine if 1 m 3 blocks of stainless steel, borosilicate glass and quartz ware were placed in a furnace and heated by 500 °C. High purity synthetic quartz glass is 4.9×10-7（0-200℃）-5.0×10-7（5-35℃）. Applications. fused quartz) has a thermal expansion coefficient about 1/18th of that of ordinary glass; a red hot silica glass rod can be dipped into water without cracking. Quartz is positive birefringent. I could not find any intermediate materials and it appears quite an uncompromissing jump between the two. Many graphs of quartz thermal expansion vs. temperature can be found using google, however these vary so the picture is not so clear as the 573 degree designator suggests. The purity of quartz glass has an effect on the expansion coefficient. range from 0°C to 80°C. Quartz has low coefficient of thermal expansion. Among these are: high chemical purity and resistance, high softening temperature and thermal resistance, low thermal expansion with high resistance to thermal … The thermal expansion coefficient of quartz glass is only 1/10 to 1/20 of ordinary glass. 13.37 x 10-6 /°C perpendicular to Z-axis in a temp. A number of unique optical, mechanical and thermal properties have made quartz glass an indispensable material in the fabrication of high-tech products. Fused quartz is used in ultraviolet transmission, clear lens, and other optics for the ultraviolet spectrum. Opaque quartz glass is 5.5×10-7. Thermal conductivity @ 50 °C: 0.0255 cal/(cm/sec/°C) parallel to Z-axis. For the Semiconductor an Solar industries, fused quartz is used in high temperature processes because of its high softening point, low thermal expansion and excellent thermal shock resistance . Compromise between Pyrex and Quartz thermal expansion? Be careful not to confuse terminology in this material, as "Fused Quartz" is often used to denote the glassy non-crystalline form better known as Silica. List of Thermal Expansion Coefficients (CTE) for Natural and Engineered Materials MSE Supplies is a leading supplier of high quality materials, equipment and materials characterization services for advanced materials research and manufacturing. Thermal expansion: 7.97 x 10-6 /°C parallel to Z-axis in a temp. Through its unique combination of thermal, mechanical and optical properties, fused quartz is one of the most important materials for industry and research. Abstract: Existing data for thermal expansion of alpha quartz (between -50 degrees C and 150 degrees C) have been critically analyzed. One of the most attractive features of quartz glass is its very low thermal coefficient of expansion (CTE). - posted in ATM, Optics and DIY Forum: What telescope mirror materials are there with thermal expansions between borosilicate and quartz/fused silica? Silica glass (quartz glass a.k.a. The linear expansion coefficient of the general transparent quartz glass （0-100℃） is 5.4×10-7. 0.0148 cal/(cm/sec/°C) perpendicular to Z-axis.