All our Silicon is monocrystalline. We offer three grades which include Standard Optical Grade, Mirror Grade, and EXT Grade. You can choose from three surface finishes, Standard, Fine and Superfine. Additional information on Physical and Optical properties, Material specifications, Shapes and Sizes, Tolerances, and Surface Quality are given below. Product data sheet of our Silicon    [Printer-Friendly] Physical Properties[1] Melting Point 1414°C Density 2.329 g/cm3 Thermal Expansion Coefficient 2.6 x 10-6/K Youngs Modulus <111> 187 GPa     Optical Properties[2] Refractive Index   Dn/dT 1.56 x 10-4/°K @ 5.2µ Transmission       Material Specifications   Purity > 99.999% Crystal Structure Monocrystalline Type/Dopant N/Phosphorous; P/Boron Orientation <111>; <100> Resistivity 5.0 - 40 /cm Standard Optical Grade > 10/cm Minor Grade 1.0 - 10/cm EXT Grade > 50/cm EXT Grade has specific enhanced properties in transmission.     Products Rods and Discs 10 - 300 mm Domes 50 - 250 mm Plano Optics 10 - 300 mm; 200 x 200 mm Lenses 10 - 300 mm Rectangular and other shapes 200 x 200 mm; max. 300 mm diagonal Witness samples and wedges 25.4mm ; 1 - 10 mm thick     Tolerances Tolerances are diameter dependent, and they are based on 10mm minimum to 300mm maximum. Fabrication is according to DIN 286-2 (1990-11) and ASME Y14.5M 1994. Tighter tolerances are available upon request.   Diameter ± 0.2 mm to ± 1.5 mm Thickness ± 0.1 mm to ± 0.8 mm Flatness ± 30’ Parallelism ≤ 25 µm Perpendicularity ≤ 30 µm Chamfer 0.1 to 1.6 mm ETV ≤ 30 µm Roundness ≤ 30 µm Length and Width ± 0.05 mm     Surface Quality As cut     Standard D46 Rq = 2 μm max. Fine D15 Rq = 0.8 μm max. Superfine D7 Rq = 0.2μm max. Polished       S/D: 60/40 or better   Flatness: 5 fringes   Irregularity: 2 fringes   Parallelism: 0.01 mm       Rq is defined as RMS deviation of all peaks/valleys to surface. Polishing provided for filters and witness samples only.     Quality Assurance   Full traceability according to MIL 130 Standard back to Melt / Lot     [1] Taken from NIST Database [2] Measured by Photonic Sense	Germanium Data Sheet More About Germanium Silicon Data Sheet More About Silicon
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