Schott N-LAK33B 755523.422, Optical Glass

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Schott N-LAK33B 755523.422, Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Information provided by SCHOTT.
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Physical Properties	Original Value	Comments

Density	4.22 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	51.3
Alkali Class, AR	1.0
Stain Resistance Class, FR	1.0

Mechanical Properties	Original Value	Comments
Hardness, Knoop	797	HK (0.1/20)
Modulus of Elasticity	122 GPa
Poissons Ratio	0.295
Shear Modulus	47.1 GPa	Calculated

Thermal Properties	Original Value	Comments
CTE, linear	5.80 µm/m-°C @Temperature -30.0 - 70.0 °C
	7.10 µm/m-°C @Temperature 20.0 - 300 °C
Specific Heat Capacity	0.560 J/g-°C
Thermal Conductivity	0.890 W/m-K
Transformation Temperature, Tg	668 °C
Softening Point	750 °C	viscosity of 10^7.6 cP
Annealing Point	670 °C	viscosity of 10¹³ cP

Optical Properties	Original Value	Comments
Refractive Index	1.713 @Wavelength 2323.4 nm
	1.721 @Wavelength 1970.1 nm
	1.729 @Wavelength 1529.6 nm
	1.737 @Wavelength 1060 nm
	1.738 @Wavelength 1014 nm
	1.74292 @Wavelength 852.1 nm
	1.748 @Wavelength 706.5 nm
	1.75 @Wavelength 656.3 nm
	1.751 @Wavelength 632.8 nm
	1.751 @Wavelength 643.8 nm
	1.754 @Wavelength 589.3 nm
	1.755 @Wavelength 587.6 nm
	1.758 @Wavelength 546.1 nm
	1.765 @Wavelength 480 nm
	1.765 @Wavelength 486.1 nm
	1.772 @Wavelength 435.8 nm
	1.779 @Wavelength 404.7 nm
	1.79 @Wavelength 365 nm
	1.803 @Wavelength 334.1 nm
	1.814 @Wavelength 312.6 nm
	1.824 @Wavelength 296.7 nm
Abbe Number	52.07	ve
	52.3	vd
Optical Dispersion	0.014436	nf - nc
	0.014566	nf' - nc'
Transmission, Visible	97.1 % @Thickness 25.0 mm, Wavelength 420 nm
	97.9 % @Thickness 25.0 mm, Wavelength 436 nm
	98.6 % @Thickness 25.0 mm, Wavelength 460 nm
	98.8 % @Thickness 10.0 mm, Wavelength 420 nm
	99.2 % @Thickness 10.0 mm, Wavelength 436 nm
	99.3 % @Thickness 25.0 mm, Wavelength 620 nm
	99.3 % @Thickness 25.0 mm, Wavelength 500 nm
	99.4 % @Thickness 25.0 mm, Wavelength 660 nm
	99.4 % @Thickness 25.0 mm, Wavelength 580 nm
	99.4 % @Thickness 10.0 mm, Wavelength 460 nm
	99.5 % @Thickness 25.0 mm, Wavelength 700 nm
	99.5 % @Thickness 25.0 mm, Wavelength 546 nm
	99.7 % @Thickness 10.0 mm, Wavelength 500 nm
	99.7 % @Thickness 10.0 mm, Wavelength 620 nm
	99.8 % @Thickness 10.0 mm, Wavelength 546 nm
	99.8 % @Thickness 10.0 mm, Wavelength 700 nm
	99.8 % @Thickness 10.0 mm, Wavelength 660 nm
	99.8 % @Thickness 10.0 mm, Wavelength 580 nm
IR Transmittance	10 % @Thickness 25.0 mm, Wavelength 2500 nm
	38 % @Thickness 25.0 mm, Wavelength 2325 nm
	39.8 % @Thickness 10.0 mm, Wavelength 2500 nm
	67.9 % @Thickness 10.0 mm, Wavelength 2325 nm
	85 % @Thickness 25.0 mm, Wavelength 1970 nm
	93.7 % @Thickness 10.0 mm, Wavelength 1970 nm
	96.3 % @Thickness 25.0 mm, Wavelength 1530 nm
	98.5 % @Thickness 10.0 mm, Wavelength 1530 nm
	99.5 % @Thickness 25.0 mm, Wavelength 1060 nm
	99.8 % @Thickness 10.0 mm, Wavelength 1060 nm
UV Transmittance	1.0 % @Thickness 25.0 mm, Wavelength 300 nm
	2.2 % @Thickness 10.0 mm, Wavelength 280 nm
	3.0 % @Thickness 25.0 mm, Wavelength 310 nm
	11.8 % @Thickness 10.0 mm, Wavelength 290 nm
	14 % @Thickness 25.0 mm, Wavelength 320 nm
	21.7 % @Thickness 10.0 mm, Wavelength 300 nm
	28.3 % @Thickness 10.0 mm, Wavelength 310 nm
	35 % @Thickness 25.0 mm, Wavelength 334 nm
	45.5 % @Thickness 10.0 mm, Wavelength 320 nm
	61 % @Thickness 25.0 mm, Wavelength 350 nm
	65.7 % @Thickness 10.0 mm, Wavelength 334 nm
	79 % @Thickness 25.0 mm, Wavelength 365 nm
	82.1 % @Thickness 10.0 mm, Wavelength 350 nm
	83 % @Thickness 25.0 mm, Wavelength 370 nm
	89 % @Thickness 25.0 mm, Wavelength 380 nm
	91 % @Thickness 10.0 mm, Wavelength 365 nm
	92.8 % @Thickness 10.0 mm, Wavelength 370 nm
	93 % @Thickness 25.0 mm, Wavelength 390 nm
	95 % @Thickness 25.0 mm, Wavelength 400 nm
	95.4 % @Thickness 10.0 mm, Wavelength 380 nm
	95.6 % @Thickness 25.0 mm, Wavelength 405 nm
	97.1 % @Thickness 10.0 mm, Wavelength 390 nm
	98 % @Thickness 10.0 mm, Wavelength 400 nm
	98.2 % @Thickness 10.0 mm, Wavelength 405 nm

Descriptive Properties
Acid resistance class	4	according to JOGIS
Climatic resistance	1
Phosphate resistance	2
Stress optical coefficient	1.43	[10^-6mm²/N]
Water resistance class	1	according to JOGIS
Yield point/sag temperature	702°C

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