Thermal Properties
|
SD-2 |
Borosilicate |
Coefficient of Thermal Expansion |
32.0x10-7/°C |
32.5x10-7/°C |
Transformation Point (Tg) |
721°C |
552°C |
Sag Point (Ts) |
787°C |
|
Strain Point |
669°C |
510°C |
Annealing Point |
720°C |
560°C |
Thermal Conductivity |
0.0026 Cal/sec·m°C |
0.0027 Cal/sec·m°C |
Specific Heat |
0.176 Cal/g°C |
0.180 Cal/g°C |
Mechanical Properties
|
SD-2 |
Borosilicate |
Specific Gravity |
2.60 |
2.23 |
Young's Modulus |
8860 kgf/mm2 |
6400 kgf/mm2 |
Modulus of Rigidity |
3560 kgf/mm2 |
|
Poisson's Ratio |
0.244 |
0.200 |
Knoop Hardness |
638 kgf/mm2 |
418 kgf/mm2 |
Electrical Properties
|
SD-2 |
Borosilicate |
Volume Resistivity (DC500V) 20°C |
4.1 x 1014 Ω·cm |
1.4 x 1016 Ω·cm |
Volume Resistivity (DC500V) 100°C |
4.2 x 1011 Ω·cm |
4.6 x 1011 Ω·cm |
Volume Resistivity (DC500V) 200°C |
3.8 x 109 Ω·cm |
0.9 x 109 Ω·cm |
Dielectric Coefficient (1MHz) 20°C |
6.0 |
4.8 |
Dielectric Coefficient (1MHz) 100°C |
7.0 |
4.9 |
Dielectric Coefficient (1MHz) 200°C |
7.0 |
5.1 |
Dielectric Loss (1MHz) 20°C |
1.0 x 10-2 |
5.5 x 10-3 |
Dielectric Loss (1MHz) 100°C |
1.9 x 10-2 |
1.0 x 10-2 |
Dielectric Loss (1MHz) 200°C |
4.9 x 10-2 |
2.9 x 10-2 |
Chemical Properties
|
SD-2 |
Borosilicate |
Acid Durability
(30% HNO3 80°C 50H) |
1.20 mg/cm2 loss |
0.50 mg/cm2 loss |
Alkaline Durability
(0.01N NaOH 50°C 15H) |
0.01 mg/cm2loss |
0.02 mg/cm2loss |
Optical Properties
|
SD-2 |
Borosilicate |
Refractive Index (nd) |
1.531 |
1.474 |
Abbe-Number (vd) |
59 |
|