PYREX^® 7740

Special Properties

• High temperature resistance
• Low expansion coefficient
• Good shock resistance
• CTE is a good match to silicon (anodic bonding)
• Low specific weight

Typical Applications

• Glass substrates for dielectric coatings
• PYREX^® Wafers for anodic bonding
• Sensor substrates
• Heat shields and covers
• Neutron absorber glass
• High temperature environments
• Material for science & development
• Harsh environments
• Chemical laboratory equipment

Unprocessed PYREX® borosilicate glass materials come in unpolished large glass blocks or as rolled glass. They can be sawn, ground, polished, and shaped according to customer-specific requirements.

 

PYREX^® 7740 borosilicate glass is a technical glass composition from Corning with excellent thermal properties. The material is an industry standard since a long time used for the manufacturing of glass wafers and temperature resistant optics. A low coefficient of expansion which is nearly only one-third of what ordinary soda lime glass materials can offer allows a good heat shock resistance and facilitates to use of PYREX^® glass at a high operating temperature. Glass Wafers made of PYREX 7740 borosilicate glass have been used in semiconductor industry for a long time and were a good solution for anodic bonding processes, because the thermal coefficient of expansion is close to silicon. A high chemical resistance, which is much better than the one of soda lime glass, and an excellent optical transmission over a wide wavelength range make PYREX^® borosilicate glass a versatile option for many special glass and optics applications that are not possible with soda lime glass materials. PYREX^® glass can be ground, polished, shaped, and coated according to custom specific requirements.

In order to request a quotation for windows, substrates or other optics made of PYREX® borosilicate glass with individual dimensions please use the button below:

 

Request for Quotation

 

Availability note: The production of PYREX^® 7740 brand borosilicate glass has been discontinued by Corning many years ago. There is no remaining stock existing so based on this glass quotes aren't possible anymore. Nevertheless, we have equivalent superior quality borosilicate glass materials like BOROFLOAT^® and MEMpax^®  that feature an almost identical glass composition and nearly identical or better specifications. For high temperature requirements please take a look on our quartz glass and fused silica materials page. Please browse our web site and send us your inquiry. We will be pleased to assist you in the selection of the perfect replacement glass material for PYREX^® 7740 borosilicate glass that fits your individual application.

 

Specifications of PYREX^® Borosilicate Glass

Enlarge transmission curve of PYREX^®

Refractive Index

• n_d = 1,474 (588 nm)

Density

• 2,23 g/cm³

Coefficient of Thermal Expansion (0-300°C)

• 3,25 x 10^-6

Young's Modulus

• 6400 kg/mm²

Dielectric Constant

• 4,6 (20 °C ; 1 MHz)

Loss Factor

• 0,5% (20 °C ; 1 MHz)

Further detailed glass specifications on request.

 

All given details and specifications are mean reference values and are not guaranteed. In addition please consider our "Notes on technical specifications"