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Schott N-BAK4HT 569560.305, Optical Glass
Categories: Ceramic; Glass; Optical
Material Notes:

Information provided by SCHOTT.
Vendors: No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
 
Physical PropertiesOriginal ValueComments
Density 3.05 g/cc
 
Chemical PropertiesOriginal ValueComments
Acid Class, SR 1.2
Alkali Class, AR 1.0
Stain Resistance Class, FR 0.00
 
Mechanical PropertiesOriginal ValueComments
Hardness, Knoop 550HK (0.1/20)
Modulus of Elasticity 77.0 GPa
Poissons Ratio 0.24
Shear Modulus 31.0 GPaCalculated
 
Thermal PropertiesOriginal ValueComments
CTE, linear 7.00 µm/m-°C
@Temperature -30.0 - 70.0 °C
 7.90 µm/m-°C
@Temperature 20.0 - 300 °C
Specific Heat Capacity 0.680 J/g-°C
Thermal Conductivity 0.880 W/m-K
Transformation Temperature, Tg 581 °C
Softening Point 569 °Cviscosity of 107.6 cP
Annealing Point 581 °Cviscosity of 1013 cP
 
Optical PropertiesOriginal ValueComments
Refractive Index 1.54
@Wavelength 2323.4 nm
 1.546
@Wavelength 1970.1 nm
 1.551
@Wavelength 1529.6 nm
 1.556
@Wavelength 1060 nm
 1.557
@Wavelength 1014 nm
 1.56
@Wavelength 852.1 nm
 1.564
@Wavelength 706.5 nm
 1.565
@Wavelength 656.3 nm
 1.566
@Wavelength 632.8 nm
 1.566
@Wavelength 643.8 nm
 1.568
@Wavelength 587.6 nm
 1.568
@Wavelength 589.3 nm
 1.571
@Wavelength 546.1 nm
 1.575
@Wavelength 486.1 nm
 1.579
@Wavelength 480 nm
 1.581
@Wavelength 435.8 nm
 1.586
@Wavelength 404.7 nm
 1.594
@Wavelength 365 nm
Abbe Number 55.7ve
 55.98vd
Optical Dispersion 0.010162nf - nc
 0.010255nf' - nc'
Transmission, Visible 99.2 %
@Thickness 25.0 mm,
Wavelength 420 nm
 99.3 %
@Thickness 25.0 mm,
Wavelength 436 nm
 99.5 %
@Thickness 25.0 mm,
Wavelength 460 nm
 99.6 %
@Thickness 25.0 mm,
Wavelength 620 nm
 99.6 %
@Thickness 25.0 mm,
Wavelength 660 nm
 99.6 %
@Thickness 25.0 mm,
Wavelength 700 nm
 99.6 %
@Thickness 25.0 mm,
Wavelength 500 nm
 99.6 %
@Thickness 25.0 mm,
Wavelength 580 nm
 99.6 %
@Thickness 25.0 mm,
Wavelength 546 nm
 99.7 %
@Thickness 10.0 mm,
Wavelength 436 nm
 99.7 %
@Thickness 10.0 mm,
Wavelength 420 nm
 99.8 %
@Thickness 10.0 mm,
Wavelength 460 nm
 99.8 %
@Thickness 10.0 mm,
Wavelength 660 nm
 99.8 %
@Thickness 10.0 mm,
Wavelength 620 nm
 99.8 %
@Thickness 10.0 mm,
Wavelength 580 nm
 99.8 %
@Thickness 10.0 mm,
Wavelength 500 nm
 99.8 %
@Thickness 10.0 mm,
Wavelength 700 nm
 99.8 %
@Thickness 10.0 mm,
Wavelength 546 nm
IR Transmittance 67.3 %
@Thickness 25.0 mm,
Wavelength 2500 nm
 81.1 %
@Thickness 25.0 mm,
Wavelength 2325 nm
 85.4 %
@Thickness 10.0 mm,
Wavelength 2500 nm
 92 %
@Thickness 10.0 mm,
Wavelength 2325 nm
 94.9 %
@Thickness 25.0 mm,
Wavelength 1970 nm
 97.9 %
@Thickness 10.0 mm,
Wavelength 1970 nm
 99.1 %
@Thickness 25.0 mm,
Wavelength 1530 nm
 99.6 %
@Thickness 10.0 mm,
Wavelength 1530 nm
 99.8 %
@Thickness 25.0 mm,
Wavelength 1060 nm
 99.9 %
@Thickness 10.0 mm,
Wavelength 1060 nm
UV Transmittance 1.5 %
@Thickness 10.0 mm,
Wavelength 320 nm
 9.5 %
@Thickness 25.0 mm,
Wavelength 334 nm
 39 %
@Thickness 10.0 mm,
Wavelength 334 nm
 59.5 %
@Thickness 25.0 mm,
Wavelength 350 nm
 81.2 %
@Thickness 10.0 mm,
Wavelength 350 nm
 85.9 %
@Thickness 25.0 mm,
Wavelength 365 nm
 90 %
@Thickness 25.0 mm,
Wavelength 370 nm
 94.1 %
@Thickness 10.0 mm,
Wavelength 365 nm
 94.9 %
@Thickness 25.0 mm,
Wavelength 380 nm
 95.9 %
@Thickness 10.0 mm,
Wavelength 370 nm
 97.2 %
@Thickness 25.0 mm,
Wavelength 390 nm
 97.9 %
@Thickness 10.0 mm,
Wavelength 380 nm
 98.3 %
@Thickness 25.0 mm,
Wavelength 390 nm
 98.5 %
@Thickness 25.0 mm,
Wavelength 400 nm
 98.9 %
@Thickness 10.0 mm,
Wavelength 390 nm
 99.1 %
@Thickness 25.0 mm,
Wavelength 405 nm
 99.3 %
@Thickness 10.0 mm,
Wavelength 390 nm
 99.4 %
@Thickness 10.0 mm,
Wavelength 400 nm
 99.6 %
@Thickness 10.0 mm,
Wavelength 405 nm
 
Descriptive Properties
Climatic resistance1
Grindability2
Phosphate resistance1
Stress optical coefficient2.9[10-6mm2/N]

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