PROPERTIES
Where applicable, units are stated in Metric and English |
MECHANICAL
|
|
|
Metric
|
English
|
|
Density (20oC, 68oF)
|
2.38 g/cc
|
148.5 lb/ft3
|
|
Young’s Modulus
|
73.6 GPa
|
10.7 x 106 psi
|
|
Shear Modulus
|
30.1 GPa
|
4.4 x 106 psi
|
|
Poisson’s Ratio
|
0.23
|
|
Vickers Hardness 640 (200 gm load, 25 sec dwell)
|
640
|
|
THERMAL EXPANSION
|
|
0 — 300 oC
|
31.7 x 10-7/oC
(0 - 300oC)
|
17.7 x 10-7/oF
(32 - 572oF)
|
|
Room Temperature
|
35.5 x 10-7/oC
|
19.7 x 10-7/oF
|
|
To Setting Point
|
(25 - 675oC)
|
(77 - 1247oF)
|
|
THERMAL CONDUCTIVITY
Thermal Conductivity is a calculated value, and is equal to the product of the Thermal diffusivity multiplied by Specific Heat multiplied by Density of the glass.
|
|
Temp (oC)
|
Specific Heat
(J/gm-oK)
|
Thermal Diffusivity
(cm2/sec)
|
Thermal Conductivity
(W/cm-oK)
|
|
23
|
0.768
|
0.00601
|
0.0109
|
|
100
|
0.896
|
0.00572
|
0.0122
|
|
100
|
0.998
|
0.00546
|
0.0129
|
|
100
|
1.067
|
0.00530
|
0.0134
|
|
100
|
1.110
|
0.00522
|
0.0137
|
|
100
|
1.154
|
0.00518
|
0.0142
|
|
VISCOSITY
|
|
Working Point (104 poises)
|
1293
|
|
Softening Point (107.6 poises)
|
971
|
|
Annealing Point (1013 poises)
|
722
|
|
Strain Point (1014.5 poises)
|
669
|
|
ELECTRICAL
|
|
Log10Volume Resistivity (ohm-cm):
12.9 (250oC, 482oF)
8.8 (500oC, 932oF)
Dielectric Constant: 5.27
(20oC/68oF – 1 kHz)
Loss Tangent: 0.30%
(20oC/68oF – 1 kHz)
|
CHEMICAL
|
|
Weathering: 1
Weathering is defined as corrosion by atmospheric-borne gases and vapor such as water and carbon dioxide. Glasses rated 1
will almost never show weathering effects, those rated 2 will occasionally be troublesome, particularly if weathering
products cannot be removed, those rated 3 require more careful consideration.
Durability:
Durability is measured via weight loss per surface
area after immersion. Values are highly dependent upon actual
testing conditions. Unless otherwise noted, concentrations
refer to weight percent.
|
Reagent
|
Time
|
Temp
|
Weight Loss (mg/cm2)
|
|
HCl – 5%
|
24 hrs
|
95oC
|
0.79
|
|
HNO3 – 1M
|
24 hrs
|
95oC
|
0.49
|
|
HF – 10%
|
20 min
|
20oC
|
5.18
|
|
HF – 10%
|
20 min
|
20oC
|
0.84
|
|
1HF:10HNO3
|
3 min
|
20oC
|
1.48
|
|
1HF:100HNO3
|
3 min
|
20oC
|
0.16
|
|
DI H2O
|
24 hrs
|
95oC
|
0.00
|
|
Na2CO3 – 0.02N
|
6 hrs
|
95oC
|
0.16
|
|
NaOH – 5%
|
6 hrs
|
95oC
|
1.83
|
|
Total alkali content is approximately: 0.1 wt% (Typical < 0.05 wt%)
|
|
| Optical Wavelength |
Refractive Index |
| 435.8 nm |
1.5198 |
| 467.8 nm |
1.5169 |
| 480 nm |
1.5160 |
| 508.6 nm |
1.5141 |
| 546.1 nm |
1.5119 |
| 589.3 nm |
1.5099 |
| 643.8 nm |
1.5078 |
|
|
You can find more information here:
Material Information .
Product Information. |
