Abbe Number (v_d):

65.41

Bevel:

Protective as needed

Clear Aperture (%):

≥90

Clear Aperture CA (mm):

18.00

Diameter (mm):

20.00 ±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):

Regulatory Compliance

RoHS 2015:

Compliant

Reach 224:

Compliant

Certificate of Conformance:

View

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
20.0mm Optic Dia., Optic Mount	Fixed	#64-559	₹2,550.00 Qty 1+ ₹2,550.00 Request Quote	10 to 12 days ×
2.0 - 35.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#03-668	₹4,760.00 Qty 10+ ₹4,208.00 Request Quote	10 to 12 days ×
9.5 - 73.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#36-605	₹5,950.00 Qty 10+ ₹5,270.00 Request Quote	10 to 12 days ×
5.0 - 25.0mm Optic Height, Metric Bar-Type Optic Holder	Fixed	#55-529	₹7,650.00 Qty 10+ ₹6,885.00 Request Quote	10 to 12 days ×
7.0 - 40.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-676	₹7,650.00 Qty 10+ ₹6,885.00 Request Quote	10 to 12 days ×
19.5 - 108.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#03-670	₹8,160.00 Qty 10+ ₹7,225.00 Request Quote	10 to 12 days ×
7.0 - 67.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-669	₹8,330.00 Qty 10+ ₹7,480.00 Request Quote	10 to 12 days ×
10.0 - 60.0mm Optic Height, Metric Bar-Type Optic Holder	Fixed	#55-530	₹8,330.00 Qty 10+ ₹7,480.00 Request Quote	10 to 12 days ×
8.0 - 118.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-666	₹8,585.00 Qty 10+ ₹7,735.00 Request Quote	10 to 12 days ×
2"/50.8mm Diameter, Bar Type Lens / Filter Holder, Quick Start Optical Mounts	Fixed	#17-530	₹11,475.00 Request Quote	Contact Us ×
4.0 - 36.0mm Optic Dia., Self-Centering Jaw Clamp	Fixed	#16-077	₹11,560.00 Qty 1+ ₹11,560.00 Request Quote	10 to 12 days ×
5.0 - 100.0mm Optic Dia., Self-Centering Jaw Clamp	Fixed	#16-078	₹30,260.00 Qty 1+ ₹30,260.00 Request Quote	10 to 12 days ×

20mm Diameter x 3.3mm Thickness, NIR Coated, BOROFLOAT® Window

Regulatory Compliance

Product Family Description