Suprasil® Standard Commercial Grade
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General Product Description
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Suprasil® Standard Commercial Grade is a high purity synthetic fused silica material manufactured by flame hydrolysis. It combines excellent physical properties with very good optical characteristics and excellent transmission from the deep UV to the near IR.
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Technical features
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- Low Bubble and Inclusion content
- Bubble class 0, occasionally isolated bubbles ≤ 10 mm
- High Purity
- UV-Transmission (typical)
k200: 3,5 x 10-3/ cm
- Standard Homogeneity in functional direction
not specified
Striae: MIL G 174 B Grade A - Stress Induced Birefringence in functional direction
SIB ≤ 20 nm/cm - Well established production processes
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Refractive index and dispersion
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nC = 1,45637 bei 656,3 nm
nd = 1,45846 bei 587,6 nm
nF = 1,46313 bei 486,1 nm
ng = 1,46669 bei 435,8 nm
n = 1,50855 bei 248 nm
At 20°C, 1 bar atmospheric pressure
Accuracy: ± 3 x 10 -5
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Geometry available today
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Diameter Ø
- 650,00 mm
- 320,00 mm
- 140,00 mm
Minimum order length
Ø 140,00 mm (±10,00 mm) - 200 mm or a multiple thereof
Ø 320,00 mm (±15,00 mm) - 100 mm or a multiple thereof
Ø 650,00 mm (± 5,00 mm) - 200 mm
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Typical chemical impurities in weight ppb
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AL≤10 - Ca≤15 - k≤10 - Na≤10 - Mg≤5 - Li≤1 - Cu≤3
Fe≤5 - Ni≤1 - Cr≤1 - Mn≤2 - Ti≤5 - - - - OH (ppm) 400-1000
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Mechanical Properties
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- Density (g/cm3) - 2,2
- Mohs hardness - 5,5 ... 6,5
- Micro hardness (N/mm2) - 8600... 9800
- Knoop hardness (N/mm2) - 5800...6200
- Moduls of elasticity at 20°C (N/mm2) - 7,0 ∙ 104
- Modulus of torsion (N/mm2) - 3,0 ∙ 104
- Poisson´s ratio - 0,17
- Compressive strength (approx.) (N/mm2) - 1150
- Tensile strength (approx.) (N/mm2) - 50
- Bending strength (approx.) (N/mm2) - 67
- Torsiona strength (approx.) (N/mm2) - 30
- Sound velocity (m/s) - 5720
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Thermal Properties
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- Softening temperature (°C) - 1600
- Annealing temperature (°C) - 1120
- Strain temperature (°C) - 1025
- Max. working temperature continuous (°C) - 950
- Short-term (°C) 1200
Mean specific heat (Jkg ∙ K)
0 ... 100°C --- 772
0 ... 500°C --- 964
0 ... 900°C --- 1052
Heat conductivity (W/m ∙ K)
20°C - 1,38
100°C - 1,46
200°C - 1,55
300°C - 1,67
400°C - 1,84
950°C - 2,68
Mean expansion coefficient (K-1)
-50 ... 0°C - - - 2,7 ∙ 10-7
0 ... 100°C - - - 5,1 ∙ 10-7
0 ... 200°C - - - 5,8 ∙ 10-7
0 ... 300°C - - - 5,9 ∙ 10-7
0 ... 600°C - - - 5,4 ∙ 10-7
0 ... 900°C - - - 4,8 ∙ 10-7
