Bayville Chemical Supply Company Inc 70-G East Jefryn Boulevard Deer Park, New York, 11729 USA Telephone: 631-586-4309 Fax: 631-254-5591 E-Mail:
Bayville Chemical Supply Company Inc70-G East Jefryn BoulevardDeer Park, New York, 11729  USA           Telephone: 631-586-4309      Fax: 631-254-5591      E-Mail: 

Fused Silica Substrates

UV Grade SiO2


Fused Silica Windows is based on UV synthetic Corning 7980 fused silica.

This Fused silica shows better performance from the UV to the IR spectrum than BK7 windows.

Fused Silica is the best choice in terms of thermal stability. In addition to superior transmission characteristics, fused silica exhibits higher thermal properties, exceptional purity, and excellent environmental durability for applications.




Fused Silica


Corning HPFS 7980

Diameter Tolerance

+0.0 mm/-0.1 mm

Thickness Tolerance



< 3 arc minute

Surface Quality

20-10 (Scratch/Dig)

Surface Figure

λ/10 @ 633 nm or better



Clear Aperture



As Requested 


Corning HPFS 7980 Glass is a result of melting synthetically derived silicon dioxide and is used in many of the same applications as fused quartz. The main differences are that fused silica transmits better in the UV and fused quartz is lower in OH content. Both are highly pure, have high chemical resistance, good thermal shock resistance, and low thermal expansion coefficient.


Thermal Properties

Mechanical Properties

Thermal Coefficient of Expansion

(0/300°C): 5.5 X 10 -7/°C


2.201 g/cm3

Annealing Point

1042°C/1907.6 °F

Knoop Hardness

522 Kg/mm2

Softening Point

1585°C / 2885 °F

Young's Modulus

72.7 Gpa

Strain Point


Poisson's Ratio






Optical Properties

Electrical Properties

Refractive Index

1.45840 (589 nm)

Dielectric Constant


Where to Find Us:

Bayville Chemical
70 East Jefryn Boulevard
Suite G
Deer Park, NY 11729

Phone: 631 586-4309

What's New

New larger location

As of August 2014, we have moved to this new, larger, modern facility to better service your needs.


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