5mm Diameter x 1.75mm Thickness, NIR Coated, BOROFLOAT® Window

Abbe Number (v_d):

65.41

Bevel:

Protective as needed

Clear Aperture (%):

≥90

Clear Aperture CA (mm):

4.50

Diameter (mm):

5.00 ±0.5

Thickness (mm):

1.75 ±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:

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 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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