Borosilicate optical window

Borosilicate 3.3 Windows Borosilicate 3.3 (PZ33) is the alternative for borofloat 33(BF33).The content of borosilicate : boron: 12.5 ～ 13.5%, silicon: 78 ～ 80%. Therefore, this kind of glass is called high borosilicate glass. Product Description Product Performance: 1. mechanical properties Density ρ: 2.23 ± 0.02g / cm3 Mohs hardness: greater than 7 2. Thermodynamic Properties Thermal expansion coefficient: (0-300 ° C) (3.3 ± 0.1) × 10-6K -1 Softening point: 820 ± 10 ℃ Strain point: 516 ± 10 ℃ Specific heat capacity: (20-100 ℃) 0.82KJ × (kg × K) -1 Thermal conductivity: 1.2W × (m × K) -1 Thermal shock resistance: 180 K The same temperature difference performance: 100 K Maximum operating temperature: short ( 10h) 450 ℃ 3. Chemical Properties Acid resistance ISO1776 / DIN12116 1 Alkali resistance ISO 695 / DIN52322 A2 4. Optical Performance Refractive index: Nd: 1.47384 Transmittance:> 91% 5. Electrical Performance Resistivity lgρ 250 ℃ 8.0Ω × cm Dielectric loss tanσ (1 MHz 20 ° C) 38 × 10-4