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:

MgF₂ (400-700nm)

Coating Specification:

R_abs ≤2.5% @ 550nm

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:

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 (%):

≥95

Type:

Protective Window

Typical Energy Density Limit:

10 J/cm² @ 532nm, 10ns

Wavelength Range (nm):

400 - 700

Young's Modulus (GPa):

Regulatory Compliance

RoHS 2015:

Compliant

Reach 223:

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.

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Title	Type	Stock Number	Price	Buy
25.0/25.4mm Optic Dia., SM1 Thin Mount, M4	Fixed	#13-787	C$23.63 Qty 5+ C$22.41 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., SM1 Thin Mount, 8-32	Fixed	#13-788	C$23.63 Qty 5+ C$22.41 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., E-Series Kinematic Mount	Adjustable - Tip-Tilt	#15-866	C$52.65 Qty 10+ C$49.95 Request Quote	In Stock ×
25.0mm Optic Dia., Optic Mount	Fixed	#64-560	C$57.38 Qty 10+ C$51.57 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., SM1 Thin Mount, M4, Quick Start Optical Mounts	Fixed	#17-536	C$70.88 Request Quote	Contact Us ×
25.0/25.4mm Optic Dia., SM1 Thin Mount, 8-32, Quick Start Optical Mounts	Fixed	#17-537	C$70.88 Request Quote	Contact Us ×
2.0 - 35.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#03-668	C$75.60 Qty 10+ C$66.83 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., Side Flange Direct Mount	Fixed	#36-414	C$80.33 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., L-Slot Direct Mount	Fixed	#36-410	C$80.33 Request Quote	In Stock ×
9.5 - 73.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#36-605	C$94.50 Qty 10+ C$83.70 Request Quote	In Stock ×
25/25.4mm Diameter, E-Series Kinematic Mount, Quick Start Optical Mounts	Adjustable - Tip-Tilt	#17-521 New ×	C$99.90 Request Quote	Contact Us ×
25.0/25.4mm Optic Dia., Kinematic Mount, 2-Screws	Adjustable - Tip-Tilt	#58-851	C$110.70 Qty 5+ C$99.63 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., L-Slot and Rotation Direct Mount	Adjustable - Rotary	#36-411	C$116.10 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., Kinematic Mount, 3-Screws	Adjustable - Tip-Tilt	#58-854	C$121.50 Qty 5+ C$109.35 Request Quote	In Stock ×
5.0 - 25.0mm Optic Height, Metric Bar-Type Optic Holder	Fixed	#55-529	C$121.50 Qty 10+ C$109.35 Request Quote	In Stock ×
7.0 - 40.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-676	C$121.50 Qty 10+ C$109.35 Request Quote	In Stock ×
19.5 - 108.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#03-670	C$129.60 Qty 10+ C$114.75 Request Quote	In Stock ×
7.0 - 67.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-669	C$132.30 Qty 10+ C$118.80 Request Quote	In Stock ×
10.0 - 60.0mm Optic Height, Metric Bar-Type Optic Holder	Fixed	#55-530	C$132.30 Qty 10+ C$118.80 Request Quote	In Stock ×
8.0 - 118.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-666	C$136.35 Qty 10+ C$122.85 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., Optical Cell Assembly	Fixed	#36-461	C$143.10 Qty 10+ C$126.90 Request Quote	In Stock ×
25/25.4mm Dia., Kinematic Mount, 3-Screws, Quick Start Optical Mounts	Adjustable - Tip-Tilt	#17-523	C$168.75 Request Quote	Contact Us ×
2"/50.8mm Diameter, Bar Type Lens / Filter Holder, Quick Start Optical Mounts	Fixed	#17-530	C$182.25 Request Quote	Contact Us ×
4.0 - 36.0mm Optic Dia., Self-Centering Jaw Clamp	Fixed	#16-077	C$183.60 Qty 5+ C$162.00 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., X-Y Translating Optic Mount	Adjustable - Linear (XY)	#62-956	C$330.75 Qty 5+ C$314.55 Request Quote	In Stock ×
25.0/25.4mm Optic Diameter, X-Y Translating Quick Start Optical Mounts	Adjustable - Linear (XY)	#17-513	C$381.78 Request Quote	Contact Us ×
25.0/25.4mm Optic Dia., Kinematic Mirror Mount	Adjustable - Tip-Tilt	#55-003	C$403.65 Qty 5+ C$383.40 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., Kinematic Mirror Mount with Micrometer	Adjustable - Tip-Tilt	#55-456	C$432.00 Qty 5+ C$410.40 Request Quote	In Stock ×
5.0 - 100.0mm Optic Dia., Self-Centering Jaw Clamp	Fixed	#16-078	C$480.60 Qty 5+ C$423.90 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., Kinematic Mirror Mount with Micrometer, Quick Start Optical Mounts	Adjustable - Tip-Tilt	#17-519	C$489.92 Request Quote	Contact Us ×
25.0/25.4mm Optic Dia., Precision Gimbal Mount	Adjustable - Gimbal	#54-999	C$552.15 Qty 5+ C$491.40 Request Quote	In Stock ×
25/25.4mm ID, Precision Gimbal Mount, Quick Start Optical Mounts	Adjustable - Gimbal	#17-517	C$614.79 Request Quote	Contact Us ×
25.0/25.4mm Optic Dia., X-Y-Z Translating Optic Mount	Adjustable - Linear (XYZ)	#62-959	C$649.35 Qty 5+ C$584.55 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., 5 Axes Optical Mount	Adjustable - Linear (XYZ) & Tip-Tilt	#13-776	C$904.50 Qty 5+ C$859.95 Request Quote	In Stock ×

25mm Diameter x 3.3mm Thickness, MgF2 Coated, BOROFLOAT® Window

Regulatory Compliance

Product Family Description

25mm Diameter x 3.3mm Thickness, MgF₂ Coated, BOROFLOAT® Window