IR FUSED QUARTZ

Density g/cm3	2.203
Mohs hardness	5.5-6.5
Micro hardness N/mm2	8600-9800
Knoop hardness N/mm2	5800-6200
Modulus of elasticity (at 20°C) N/mm2	7.0.10-4
Moduluas of torsion N/mm2	3.1.10-4
Poisson’s ratio	0.17
Compressive strength N/mm2	1150
Tensile strength N/mm2	50
Bending strength N/mm2	67
Torsional strength N/mm2	30
Sound velocity N/mm2	5720

Softening temperature °C 1730 Annealing temperature °C 1180 Strain temperature °C 1075 Max. working temperature - continuous 1150   - short term 1300 Mean specific heat J/kg . K   0-100°C 772 0-500°C 964 0-900°C 1052 Heat conductivity W/m . K 20°C 20°C 1.38 100°C 1.46 200°C 1.55 300°C 1.67 400°C 1.84 950°C 2.68 Mean termal expansion coefficient K-1 0-100°C 5.1·0 -7 0-200°C 5.8·0 -7 0-300°C 5.9·0 -7 0-600°C 5.4·0 -7 0.900°C 4.8·0 -7 -50 - 0°C 2.7·0 -7 0- -60°C 0

Resistivity inΩ · m
20°C	1016
400°C	108
800°C	6.3·104
1200°C	1.3·103

Dielectric strength in kV/mm (sample thickness ≥ 5mm)
20°C	25-40
500°C	4-5

Dielectric loss angle (tg)
1kHz	0.0005
1-1000MHz	0.0001
3·104 MHz	0.0004

Dielectric constant (ε)
20°C 0.1 MHz	3.70
23°C 9·102 MHz	3.77
23°C 3·104 MHz	3.81

AI= Aluminium 20 Ca = Calcium 1 Cr = Chromium 0.1 Cu = Copper 0.1 Fe = Iron 0.8 K = Potassium 0.8 Li = Lithium 1 Mg = Magnesium 0.1 Na = Sodium 1 Ti = Titamium 1

WHILE EVERY ATTEMPT HAS BEEN MADE TO VERIFY THE SOURCE OF THE INFORMATION, NO RESPONSIBILITY IS ACCEPTED FOR ACCURACY OF DATA.