20mm Diameter x 1.1mm Thickness, MgF 2 Coated, BOROFLOAT Window

Product Details Low Coefficient of Thermal Expansion Visible to Near Infrared Transmission High Resistance to Thermal Shock TECHSPEC BOROFLOAT Borosilicate Windows are ideal for high temperature and harsh environment applications. The windows have a low coefficient of thermal expansion of 3.25 (+20 to +300°C). TECHSPEC BOROFLOAT Borosilicate Windows feature visible to near infrared transmission. 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 . Specifications General Type: Protective Window Type of Window: Glass Physical & Mechanical Properties Clear Aperture CA (mm): 18.00 Diameter (mm): 20.00 ±0.50 Thickness (mm): 1.10 ±0.2 Bevel: Protective as needed Clear Aperture (%): ≥90 Edges: Ground and Seamed Poisson’s Ratio: 0.20 Young’s Modulus (GPa): 64 Knoop Hardness (kg/mm 2 ): 480.00 Optical Properties Coating: MgF2 (400-700nm) Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More BOROFLOAT Index of Refraction (n d ): 1.472 Surface Quality: 80-50 Transmission (%): ≥95 Abbe Number (v d ): 65.41 Coating Specification: Rabs ≤2.5% @ 550nm Wavelength Range (nm): 400 – 700 Surface Flatness (P-V): 4 – 6λ Material Properties Density (g/cm 3 ): 2.23 Transformation Temperature (°C): 525 Coefficient of Thermal Expansion CTE (10 -6 /°C): 3.25 (+20 to +300°C) Environmental & Durability Factors Operating Temperature (°C): 1 hour @ 500; >100 hours @ 450 Resistance to Temperature Difference (K): Short Term, 1 hr: 110K 1 – 100 hrs: 90K Long Term, >100 hrs: 80K Thermal Shock (K): Up to 4mm Thick: 175K 4 – 6mm Thick: 160K 6 – 15mm Thick: 150K Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 247: Compliant ×