Silica

Quartz Silica

Fused quartz is the purest form of glass, it contains above 99,95% of silicon dioxide (SiO₂). This specific composition gives outstanding properties to this material. Saint-Gobain Quartz is exclusively using natural Quartz which can be extracted at high purity only from a very limited number of mines on Earth. Our know-how is to process this highly particular material into various forms without altering its original properties. For instance, we are able to process it into: yarn, roving, felt or wool. Further details regarding these particular products can be found in our technical datasheets.

High chemical purity and resistance.
High softening temperature and thermal resistance.
Low thermal expansion with high resistance to thermal shocks.
High electromagnetic transparency.
High radiation resistance

Properties	Description	Value	Units
Physical	Density	2.2	g/cm³
	Poisson's coefficient	0.16	-
	Ultrasonic wave propagation:
	Longitudinal	5960	m.s^-1
	Tranversal	3770	m.s^-1
	Internal Dampening	0.08	dBm^-1MHz^-1

Properties	Description	Value	Units
Electrical	Dielectric constant at 10 GHz	3.74	-
	Loss factor at 10 GHz	0.0002	-
	Dielectric strength	~3.7 x 10⁷	V.m^-1
	Resistivity at 200°C	1 x 10²⁰	Ω.m
	Resistivity at 800°C	6 x 10²⁰	Ω.m
	Resistivity at 1000°C	1 x 10⁸	Ω.m

Properties	Description	Value	Units
Thermal	Linear expansion coefficient	0.54 x 10^-6	K^-1
	Specific heat at 20°C	7.5 x 10²	J.kg^-1K^-1
	Heat conductivity	1.38	W.m^-1K^-1
	Annealing point (log10n=13)	1220	°C
	Softening point (log10n=7.6)	1700	°C