,
Materials

Accuflect^®

Aluminum Nitride

Aluminum Oxide

Boron Nitride

Fused Silica

Macor^®

Mullite

Sialon

Silicon Carbide

Silicon Nitride

Zirconium Oxide

Fused Silica, SiO₂ Glass Properties

Fused silica is a noncrystalline (glass) form of silicon dioxide (quartz, sand). Typical of glasses, it lacks long range order in its atomic structure. It’s highly cross linked three dimensional structure gives rise to it’s high use temperature and low thermal expansion coefficient.

.Key Fused Silica  Properties
	Near zero thermal expansion
	Exceptionally good thermal shock resistance
	Very good chemical inertness
	Can be lapped and polished to fine finishes
	Low dielectric constant
	Low dielectric loss
	Good UV transparency
. Typical Fused Silica Uses
	High temperature lamp envelopes
	Temperature insensitive optical component supports
	Lenses, mirrors in highly variable temperature regimes
	Microwave and millimeter wave components
	Aeronautical radar windows

General Fused Silica Information

High purity sand deposits provide the raw material for bulk refractory grade, which is electric arc melted at extremely high temperatures. Optical and general purpose fused silica rods and tubing are drawn from a melt made from high purity chemicals. Fiber optic purity is made by thermal decomposition of high purity gaseous silica containing chemicals. The glass may be clear or translucent, in which case it is often referred to as fused quartz. The glass has very high viscosity, and this property allows the glass to be formed, cooled and annealed without crystallizing. Fused silica glass is a very low thermal expansion material, and so is extremely thermal shock resistant. The material is also chemically inert up to moderate temperatures except to hydrofluoric acid, which dissolves silica. It will devitrify above about 1100°C in the presence of contaminants such as sodium, phosphorus and vanadium, with the formation of cristobalite crystals which destroy the properties of the glass. The dielectric properties are stable up through gigahertz frequencies.

Download Fused Silica datasheet

Fused Silica Engineering Properties*

*All properties are room temperature values except as noted.
The data presented is typical of commercially available material and is offered for comparative purposes only. The information is not to be interpreted as absolute material properties nor does it constitute a representation or warranty for which we assume legal liability. User shall determine suitability of the material for the intended use and assumes all risk and liability whatsoever in connection therewith.

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