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Borofloat®
Glass Type: Borosilicate
Description
Borofloat® glass is manufactured by Schott and is a highly chemical resistant borosilicate glass with low thermal expansion that is produced using a float process. Other key properties include an average 80/50 scratch/dig surface quality, high thermal resistance and excellent transmission. Borofloat® can be used as a substitute for Corning Pyrex® in most cases. The materials differ slightly in chemical composition. SGP can CNC mill, drill, cut, lap, and polish Borofloat® to any dimension, shape or surface finish.
| Thermal Properties |
| Thermal Coefficient of Expansion |
(0/300°C): 32.5 X 10 -7/°C |
| Annealing Point |
560°C / 1040°F |
| Softening Point |
815°C / 1508°F |
| Strain Point |
N/A |
| Mechanical Properties |
| Density |
2.23 g/cm3 (at 25 °C / 77 °F) |
| Knoop Hardness |
HK0.1/20:480 |
| Young's Modulus |
N/A |
| Poisson's Ratio |
0.20 |
| Chemical Properties |
| Hydrolytic Resistance |
class1 |
| Acid Resistance |
class 1 |
| Alkali Resistance |
class 2 |
| Electrical Properties |
| Dielectric Constant |
E=4.6 @/MHz & 25°C |
| Resistivity |
8.0 X 250°C; 6.5 @ 350°C |
| Dielectric Strength |
16 KV/mm @ 50 Hz & 25°C | |
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