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		PYROQUARTZ®	NITROSIL®	PYROSIL®	PYRO  220®	LD80TM
DENSITY	g/cm3	2.20	2.16	2.11	2.20	1.76
HARDNESS	kg/mm2	580	560	525	580	N/A
DESIGN TENSILE STRENGTH	MPa	48	48	48	48	N/A
DESIGN COMPRESSIVE STRENGTH	MPa	1200	1200	1200	1200	N/A
POISSON’S RATIO		0.17	0.17	0.17	0.17	N/A
YOUNG’S MODULUS	GPa	72	72	72	72	N/A
BULK MODULUS	GPa	37	37	37	37	N/A
RIGIDITY MODULUS	GPa	31	31	31	31	N/A
COEFFICIENT OF THERMAL EXPANSION (0-300°C)	cm/cm°C	5.5 X 10-7	5.5 X 10-7	5.5 X 10-7	5.5 X 10-7	5.5 X 10-7
THERMAL CONDUCTIVITY	W/mK	1.4	1.3	1.2	1.4	0.9
SPECIFIC HEAT	J/kg°C	670	670	670	670	670
SOFTENING POINT	°C	1650	1680	1630	1680	1680
ANNEALING POINT	°C	1170	1190	1150	1170	1190
STRAIN POINT	°C	1090	1100	1070	1100	1100
INDEX OF REFRACTION		1.4585	1.4585	1.4585	1.4585	1.4585
DIELECTRIC PROPERTIES (20°C, 1 MHz)
CONSTANT		3.75	3.75	3.75	3.75	2.98
STRENGTH	V/cm	5 X 105	5 X 105	5 X 105	5 X 105	5 X 105
LOSS FACTOR		< 4 X 10-4	< 4 X 10-4	< 4 X 10-4	< 4 X 10-4	< 4 X 10-4
DISSIPATION FACTOR		< 1 X 10-4	< 1 X 10-4	< 1 X 10-4	< 1 X 10-4	< 1 X 10-4
RATE OF DISSOLUTION IN HF ACID
5% HF	nm/min	40	45	50	40	N/A
10% HF	nm/min	88	93	98	88	N/A
15% HF	nm/min	330	340	350	330	N/A

 

Chemistry Specifications

At Pyromatics, maintaining maximum purity is an ongoing effort throughout all phases of the manufacturing process. Pyromatics’ products are known for their consistent high purity and high temperature capabilities.

The high purity of molded quartz provides superior high temperature corrosion resistance and eliminates the chance of wafer contamination.

The typical chemistry¹ of Pyromatics’ products is shown below.

TYPICAL ANALYSIS (ppm)

	Al	Ca	Cu	Fe	Li	Mg	K	Na	Ti	Zr	OH-

Clear fused quartz:
PyroQuartz®	12	3	<0.1	0.8	<1	<0.2	<1	0.9	<1.5	<1	<125
PyroQuartz SM-77	12	0.8	<0.1	0.6	<1	<0.2	<1	0.8	<1.5	<1	<125
Pyro220™	12	3	<0.1	0.8	<1	<0.2	<1	0.9	<1.5	<1	50
Opaque fused quartz:
NitroSil®	12	3	<0.1	0.8	<1	<0.2	<1	0.9	<1.5	<1	<125
NitroSil SM-77	12	0.8	<0.1	0.6	<1	<0.2	<1	0.8	<1.5	<1	<125
LD80™	12	3	<0.1	0.8	<1	<0.2	<1	0.9	<1.5	<1	<125
PyroSil®	<25	<30	<5	<10	<5	<5	<5	<10	<5	<5	<125

¹The numbers shown are representative of the chemistry found on the inside surface of the parts.