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Accuflect®

Aluminum Nitride

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Fused Silica

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Silicon Carbide

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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*

Fused Silica

Mechanical

Units of Measure

SI/Metric

(Imperial)

Density

gm/cc (lb/ft3)

2.2

(137.4)

Porosity

% (%)

0

0

Color

clear

Flexural Strength

MPa (lb/in2x103)

Elastic Modulus

GPa (lb/in2x106)

73

(10.6)

Shear Modulus

GPa (lb/in2x106)

31

(4.5)

Bulk Modulus

GPa (lb/in2x106)

41

(6)

Poisson’s Ratio

0.17

(0.17)

Compressive Strength

MPa (lb/in2x103)

1108

(160.7)

Hardness

Kg/mm2

600

Fracture Toughness KIC

MPa•m1/2

Maximum Use Temperature
(no load)

°C (°F)

1100

(2000)

Thermal

Thermal Conductivity

W/m•°K (BTU•in/ft2•hr•°F)

1.38

(9.6)

Coefficient of Thermal Expansion

10–6/°C (10–6/°F)

0.55

(.31)

Specific Heat

J/Kg•°K (Btu/lb•°F)

740

(0.18)

Electrical

Dielectric Strength

ac-kv/mm (volts/mil)

30

(750)

Dielectric Constant

@ 1 MHz

3.82

(3.82)

Dissipation Factor

@ 1 MHz

0.00002

(0.00002)

Loss Tangent

@ 1 MHz

Volume Resistivity

ohm•cm

>1010

*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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