Glass Type: Borosilicate
Description
Pyrex(R) 7740 is Corning’s trade name borosilicate glass. It has a low coefficient of thermal expansion and good heat shock resistance. Pyrex(R) can be used as a substitute for SCHOTT Borofloat(R) in most cases. CGQPI can CNC mill, drill, cut, lap, and polish Pyrex(R) to any dimension, shape or surface finish.
| Thermal Properties | Mechanical Properties | ||||||
|---|---|---|---|---|---|---|---|
| Thermal Coefficient of Expansion | (0/300°C): 32.5 X 10-7/°C | Density | 2.23 g/cm3 (at 20°C/68°F) | ||||
| Annealing Point | 560°C/1040° F | Knoop Hardness | 448 kg/mm2 | ||||
| Softening Point | 821°C/1509.8°F | Young’s Modulus | 64 G pa | ||||
| Strain Point | 510°C / 950° F | Poisson’s Ratio | 0.20 | ||||
| Chemical Properties | Electrical Properties | ||||||
|---|---|---|---|---|---|---|---|
| Hydrolytic Resistance | class 1 | Dielectric Constant | E=4.61 MHz <5>R.T. | ||||
| Acid Resistance | class 1 | Resistivity | 8 X 1010 ohm/cm @R.T. | ||||
| Alkali Resistance | class 2 | Dielectric Strength | 0.5 KV/mm | ||||
| Optical Properties | |||
|---|---|---|---|
| Refractive Index | 1.473 (589.3 nm) | ||
