Abbe Number (v_d):

65.41

Bevel:

Protective as needed

Clear Aperture (%):

≥90

Clear Aperture CA (mm):

22.50

Diameter (mm):

25.00 ±0.5

Thickness (mm):

3.30 ±0.2

Coating:

NIR (700-1150nm)

Coating Specification:

R_avg <1.0% @ 700 - 1150nm

Coefficient of Thermal Expansion CTE (10^-6/°C):

3.25 (+20 to +300°C)

Density (g/cm³):

2.23

Edges:

Ground

Index of Refraction n_d:

1.472

Knoop Hardness (kg/mm²):

480

Operating Temperature (°C):

1 hour @ 500; >100 hours @ 450

Poisson's Ratio:

0.2

Resistance to Temperature Difference (K):

Short Term, 1 hr: 110K
1 - 100 hrs: 90K
Long Term, >100 hrs: 80K

Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More

BOROFLOAT^®

Surface Flatness (P-V):

4 - 6λ

Surface Quality:

80-50

Thermal Shock (K):

Up to 4mm Thick: 175K
4 - 6mm Thick: 160K
6 - 15mm Thick: 150K

Transformation Temperature (°C):

525

Transmission (%):

≥97

Type:

Protective Window

Wavelength Range (nm):

700 - 1150

Young's Modulus (GPa):

Type of Window:

Glass

Regulatory Compliance

RoHS 2015:

Compliant

Certificate of Conformance:

View

Reach 233:

Compliant

Product Family Description

Low Coefficient of Thermal Expansion
Visible to Near Infrared Transmission
High Resistance to Thermal Shock

BOROFLOAT® Borosilicate Windows are ideal for high temperature and harsh environment applications. Unlike common borosilicate that is drawn flat, BOROFLOAT® is produced by a float technique that yields superior surface flatness — typically 4 - 6λ per inch. BOROFLOAT® is about three times more resistant to thermal shock than standard soda lime glass.

Can’t find what you need? Get a quick custom quote.

Title	Type	Stock Number	Price	Buy
8.0 - 118.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-666	€107,00 Qty 10+ €96,30 Request Quote	3-4 days ×
2.0 - 35.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#03-668	€59,00 Qty 10+ €52,40 Request Quote	3-4 days ×
7.0 - 67.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-669	€103,00 Qty 10+ €92,70 Request Quote	3-4 days ×
19.5 - 108.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#03-670	€101,00 Qty 10+ €89,20 Request Quote	3-4 days ×
7.0 - 40.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-676	€95,00 Qty 10+ €85,50 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., Optical Cell Assembly	Fixed	#36-461	€112,00 Qty 10+ €99,30 Request Quote	3-4 days ×
9.5 - 73.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#36-605	€74,00 Qty 10+ €65,40 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., Precision Gimbal Mount	Adjustable - Gimbal	#54-999	€422,00 Qty 5+ €375,60 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., Kinematic Mirror Mount	Adjustable - Tip-Tilt	#55-003	€308,00 Qty 5+ €292,70 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., Kinematic Mirror Mount with Micrometer	Adjustable - Tip-Tilt	#55-456	€330,00 Qty 5+ €313,60 Request Quote	3-4 days ×
5.0 - 25.0mm Optic Height, Metric Bar-Type Optic Holder	Fixed	#55-529	€93,00 Qty 10+ €83,70 Request Quote	3-4 days ×
10.0 - 60.0mm Optic Height, Metric Bar-Type Optic Holder	Fixed	#55-530	€101,00 Qty 10+ €90,90 Request Quote	Contact Us ×
25.0/25.4mm Optic Dia., Kinematic Mount, 2-Screws	Adjustable - Tip-Tilt	#58-851	€91,00 Qty 5+ €81,90 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., Kinematic Mount, 3-Screws	Adjustable - Tip-Tilt	#58-854	€99,00 Qty 5+ €89,10 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., X-Y Translating Optic Mount	Adjustable - Linear (XY)	#62-956	€253,00 Qty 5+ €240,40 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., X-Y-Z Translating Optic Mount	Adjustable - Linear (XYZ)	#62-959	€496,00 Qty 5+ €446,40 Request Quote	3-4 days ×
25.0mm Optic Dia., Optic Mount	Fixed	#64-560	€44,00 Qty 10+ €39,60 Request Quote	Contact Us ×
25.0/25.4mm Optic Dia., L-Slot Direct Mount	Fixed	#36-410	€63,00 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., L-Slot and Rotation Direct Mount	Adjustable - Rotary	#36-411	€91,00 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., Side Flange Direct Mount	Fixed	#36-414	€63,00 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., SM1 Thin Mount, M4	Fixed	#13-787	€19,00 Qty 5+ €18,10 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., SM1 Thin Mount, 8-32	Fixed	#13-788	€19,00 Qty 5+ €18,10 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., 5 Axes Optical Mount	Adjustable - Linear (XYZ) & Tip-Tilt	#13-776	€691,00 Qty 5+ €656,60 Request Quote	3-4 days ×
4.0 - 36.0mm Optic Dia., Self-Centering Jaw Clamp	Fixed	#16-077	€141,00 Qty 5+ €124,10 Request Quote	3-4 days ×
5.0 - 100.0mm Optic Dia., Self-Centering Jaw Clamp	Fixed	#16-078	€367,00 Qty 5+ €323,70 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., E-Series Kinematic Mount	Adjustable - Tip-Tilt	#15-866	€39,00 Qty 10+ €37,10 Request Quote	3-4 days ×
25.0/25.4mm Optic Diameter, X-Y Translating Quick Start Optical Mounts	Adjustable - Linear (XY)	#17-513	€294,60 Request Quote	3-4 days ×
25/25.4mm ID, Precision Gimbal Mount, Quick Start Optical Mounts	Adjustable - Gimbal	#17-517	€473,10 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., Kinematic Mirror Mount with Micrometer, Quick Start Optical Mounts	Adjustable - Tip-Tilt	#17-519	€377,20 Request Quote	3-4 days ×
25/25.4mm Diameter, E-Series Kinematic Mount, Quick Start Optical Mounts	Adjustable - Tip-Tilt	#17-521	€77,50 Request Quote	3-4 days ×
25/25.4mm Dia., Kinematic Mount, 3-Screws, Quick Start Optical Mounts	Adjustable - Tip-Tilt	#17-523	€137,50 Request Quote	3-4 days ×
2"/50.8mm Diameter, Bar Type Lens / Filter Holder, Quick Start Optical Mounts	Fixed	#17-530	€143,70 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., SM1 Thin Mount, M4, Quick Start Optical Mounts	Fixed	#17-536	€57,50 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., SM1 Thin Mount, 8-32, Quick Start Optical Mounts	Fixed	#17-537	€57,50 Request Quote	3-4 days ×

25mm Diameter x 3.3mm Thickness, NIR Coated, BOROFLOAT® Window

Regulatory Compliance

Product Family Description