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Frequently Asked Questions

The product is made of IR Fused Silica.

The Young Modulus is 71.7 GPa, Shear Modulus is 31 GPa, Bulk Modulus is 37 GPa, Knoop Hardness is 4.5 GPa, Modulus of Rupture is 50 MPa at 25°C, Poisson's Ratio is 0.17 at 25°C, and Density is 2.20 g/cm3.

The Softening Point is 1600 ± 25°C, Strain Point is 1000 ± 20°C, Annealing Point is 1100 ± 20°C, Max Service Temperature is 1150°C (continuous) and 1300°C (limited time), Specific Heat is 670 J/kg.°C, Thermal Expansion Coefficient is 5.7x10-7 cm/(cm·°C) between 20°C-320°C, Thermal Conductivity is 1.38 W/(m·°C), and Thermal Diffusion is 7.5x10-3 cm2/sec.

The Electrical Resistivity is > 1018 Ω x m, Dielectric Strength is 250 - 400 kV/cm at 20°C, Dielectric Constant for 1 MHz is 3.75 at 20°C, Resistivity is 7 x 107ohm-cm at 350°C, Loss Factor is < 4 x 10-4, and Dissipation Factor is < 4 x 10-4.

The Transmittance for IR Fused Silica is > 90% from 250nm...3.5μm (2mm thick), Refraction Index is 1.45840 at 589.3nm, and Abbe Constant is 67.6 1/3.

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