BOROFLOAT Borosilicate Windows Pyrex Windows

COE Optics can supply Schott 3.3 Borosilicate windows or Pyrex 7740 windows, or economic China borosilicate windows. All of these are outstanding with low coefficient of expansion, high resistance to thermal shock.

Borosilicate glasses are known for having very low coefficients of thermal expansion (≈3 × 10−6 K−1 at 20 °C), making them more resistant to thermal shock than any other common glass. Such glass is subjected to less thermal stress and can withstand temperature differentials without fracturing of about 165 °C (329 °F) Borosilicate windows are mainly working in 310nm--2700nm as it has excellent transmission in that visible and NIR wavelengths.

Typical Applications

•    High Powered light source
•    Cold and hot mirrors

Many astronomical reflecting telescopes use glass mirror components made of borosilicate glass because of its low coefficient of thermal expansion. This makes very precise optical surfaces possible that change very little with temperature, and matched glass mirror components that "track" across temperature changes and retain the optical system's characteristics.