The optical properties of quartz glass are unique. It can pass through the far-ultraviolet spectrum, and is the best for all UV-transparent materials, as well as visible and near-infrared. The user can arbitrarily select the desired variety from the range of 185-3500 mμ band as needed. Due to its high temperature resistance, quartz glass has a very small thermal expansion coefficient and good chemical thermal stability. Bubbles, stripes, uniformity and birefringence are comparable to those of ordinary optical glass, so it is a highly stable optical system that works in a variety of harsh environments. Essential optical material.
The structure of quartz glass, impurity content, OH gene, NO, CO and other content are the main factors affecting the spectral transmittance. The oxygen atom binding failure has an absorption peak at 0.24μ, and quartz glass containing OH group at 2.7μ. Due to the molecular vibration, a significant absorption peak will be produced, and the low ultraviolet transmittance is mainly caused by the atomic absorption spectrum caused by the metal impurities.
Spectral characteristic curve of quartz glass
Fused silica glass is a very good infrared transparent material, but the ultraviolet transmittance is low due to the presence of impurities. The quartz glass obtained by melting the crystal of the oxyhydrogen flame has an absorption peak at 0.24 μ and an OH group due to the oxygen structure defect, so the infrared transmission is extremely low. High-purity optical quartz glass smelted with synthetic raw materials is the best UV-permeable material, but has a severe OH absorption peak at 2.7 μ. Only the optical quartz glass which is formed by melting the synthetic raw material by electrofusion or hydrogen-free flame can well penetrate the continuous spectrum from far ultraviolet to near infrared.
Brass fasteners are used for their physical and aesthetic properties. Brass is utilized due to its high thermal conductivity and corrosion resistant properties, it is suitable for use in hot and cold environments, and resistant to water corrosion, making it a staple of industries such as heating and plumbing. Brass fasteners are largely non-magnetic (like any fastener, slight magnetic properties can develop during the manufacturing process) and resistant to tarnishing.
Brass fasteners are suited for some marine environments, including brackish water and slow current sea water; brass in this environment develops a protective green coating. Brass fasteners are also commonly used with wood applications, as the golden coloring blends well with the tan wood. Brass is a softer metal and must be used with care, always drilling pilot holes and using driver bits that fit the head of the screw precisely to prevent stripping. Brass Bolts also require a pilot hole be driven before installtion.
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