round shape borosilicate gauge glass Capsule shape borosilicate reflex gauge glass
Specifications
1. Excellent visual effect
2. Powerful effect on Fire, hydrolysis and Chemical Resistance
3. High resistance to thermal shock.
BOROSILICATE FLOAT GLASS 3.3
1. Household electrical appliance (panel for oven and fireplace, microwave tray etc. );
2. Environmental engineering and chemical engineering (Lining layer of repellence, autoclave of chemical reaction and safety spectacles);
3. Lighting (spotlight and protective glass for jumbo power of floodlight);
4. Power regeneration by solar energy (solar cell base plate);
5. Fine instruments (optical filter);
6. Semi-conductor technology (LCD disc, display glass);
7. Iatrology and bio-engineering;
Mechanical properties |
|
Density (g/cm3) (at 25°C) |
2.23±0.02 |
Knoop hardness |
480 |
Flexure strength |
24Mpa |
Thermodynamic properties |
|
Coefficient of thermal expansion (α) (0-300°C) |
3.3±0.1×10-6 |
Softening point (°C) |
830±10 |
Strain point (°C) |
521±10 |
Specific heat capacity |
(2-100°C)0.83KJ×(kg×K)-1 |
Thermal conductivity |
1.2W×(m×k)-1 |
Thermal shock resistance(K) |
300 |
Temperature performance(K) |
200 |
Maximum working temperature |
(>10h, 600°C), (>10h, 550°C) |
Chemical properties |
|
Water resistence |
ISO719/DIN12111, HGB1
ISO720, HGA1 |
Acid resistance |
ISO1776/DIN12116, 1 |
Alkali resistance |
ISO695/DIN52322, A2 |
Optical properties |
|
Refractive index |
Nd: 1.47379 |
Transmittance (5mm) |
>92% |
Electrical properties |
|
Specific resistance 1g |
250°C, 8.0Ω×cm |
Dielectric loss |
Tan , 38×(10)-4 |
Dielectric Constant |
4.7 |
Chemical component |
|
SiO2 |
79-82% |
B2O3 |
8-14% |
Na2O |
2-4% |
Al2O3 |
1-6% |