TGP | opaque fused quartz

Opaque Labware Collage, Opaque Fused Quartz, Opaque Silica

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OPAQUE FUSED QUARTZ comes from the quartz sands of high purity, when reduced to a molten state, at a temperature of approximately 2000° C. The high temperature produces a vitreous material characterized by the presence of a multitude of gaseous micro-bubbles, which by diffracting the light, gives the material its opacity. The term opaque silica is mainly used for molded or centrifuged parts, while the product obtained by drawing is normally referred to as translucent.

Opaque silica glass offers a number of exceptional properties, such as:

Extreme Hardness
Low Expansion
Excellent High Temperature Resistance
Extreme Chemical Purity
Excellent Corrosion Resistance
Excellent Electrical Insulation Properties
Remarkable Stability Under Atomic Bombardment


MECHANICAL PROPERTIES
Specific Density (according to fusion process)				1.98 to 2.12
Hardness (Mohs scale)				7
Rupture Stress:	traction		N.m^-2	2.10⁷
Rupture Stress:	compression		N.m^-2	5.10⁸
ELECTRICAL PROPERTIES
Dielectric constants			V.m^-1	3.5
Dielectric rigidity				5.10⁶
Loss coefficient at 1 MHz				20.10^-4
THERMAL PROPERTIES
Linear expansion coefficient			°K^-1	5.4.10^-7
Specific heat at 20°C			J.kg¹.°K^-1	7.5.10²
Heat conductivity at 20°C			W.m^-1.°K^-1	1.05
Annealing point			°C	1120
Softening point			°C	1650
Temperature of use			°C	1800 to 2200
CHEMICAL PROPERTIES
SiO2 content			%	99.8
Element content (typical analysis)		Fe	ppm	70
		Ti	ppm	100
		Al	ppm	220
		Ca	ppm	40
		Mg	ppm	11
		Na	ppm	25
		K	ppm	40
		Li	ppm	5

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