Surstrate Material SPEC
|
Green Soda Lime
SL |
White Crown
WC |
Borosilicate
LE |
Synthetic Quartz
QZ |
Composition |
|
|
|
|
SiO2 |
73 |
70 |
60 |
100 |
B2O3 |
|
|
5 |
|
Al2O3 |
1 |
|
15 |
|
Na2O |
15 |
8 |
1 |
|
K2O |
1 |
9 |
1 |
|
RO |
10 |
14 |
18 |
|
Thermal Properties |
|
|
|
|
Coefficient of Expansion
(50-200°C) x 10-7/°C |
94 |
93 |
37 |
4-5 |
Softening point (°C) |
740 |
710 |
900 |
1600 |
Transformation temp (°C) |
562 |
520 |
673 |
|
Strain point (°C) |
511 |
505 |
636 |
1000 |
Optical Properties |
|
|
|
|
Light transmittance (%)
d=2.3mm, wavelength = 400 nm |
90 |
91 |
91 |
90
(wavelength = 200 nm) |
Refractive index nd |
1.52 |
1.52 |
1.53 |
1.46 |
Chemical Properties |
|
|
|
|
(weight loss mg/cm2) |
|
|
|
|
Water (25°C, 4 h) |
1.2 x 10-3 |
1.2 x 10-3 |
8 x 10-4 |
8 x 10-5 |
NaOH (5%) (100°C, 6 h) |
1.1 |
1.1 |
1.4 |
0.9 |
HCL (5%) (80°C, 1 h) |
1 x 10-2 |
1 x 10-2 |
5 x 10-3 |
4 x 10-4 |
Mechanical Properties |
|
|
|
|
Specific gravity |
2.49 |
2.55 |
2.58 |
2.20 |
Young modulus (kg/mm2) |
7000 |
7340 |
7540 |
7413 |
Sheer modulus (kg/mm2) |
2870 |
2980 |
3260 |
33170 |
Knoop Hardness (kg/mm2) |
540 |
530 |
657 |
615 |
Electrical Properties |
|
|
|
|
Bulk resistivity @ 200°C |
7.7 |
9.6 |
10.6 |
12.5 |
Di-electric constant at IMH, R.T. |
7.5 |
7.1 |
6.1 |
4.0 |
|