Schott N-SF6HTultra 805254.337, Optical Glass

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Schott N-SF6HTultra 805254.337, Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Information provided by SCHOTT.
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Physical Properties	Original Value	Comments

Density	3.37 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	2.0
Alkali Class, AR	1.0
Stain Resistance Class, FR	0.00

Mechanical Properties	Original Value	Comments
Hardness, Knoop	550	HK (0.1/20)
Modulus of Elasticity	93.0 GPa
Poissons Ratio	0.262
Shear Modulus	36.8 GPa	Calculated

Thermal Properties	Original Value	Comments
CTE, linear	9.00 µm/m-°C @Temperature -30.0 - 70.0 °C
	10.3 µm/m-°C @Temperature 20.0 - 300 °C
Specific Heat Capacity	0.690 J/g-°C
Thermal Conductivity	0.960 W/m-K
Transformation Temperature, Tg	589 °C
Softening Point	683 °C	viscosity of 10^7.6 cP
Annealing Point	590 °C	viscosity of 10¹³ cP

Optical Properties	Original Value	Comments
Refractive Index	1.748 @Wavelength 2323.4 nm
	1.755 @Wavelength 1970.1 nm
	1.763 @Wavelength 1529.6 nm
	1.773 @Wavelength 1060 nm
	1.774 @Wavelength 1014 nm
	1.781 @Wavelength 852.1 nm
	1.791 @Wavelength 706.5 nm
	1.796 @Wavelength 656.3 nm
	1.797 @Wavelength 643.8 nm
	1.798 @Wavelength 632.8 nm
	1.804 @Wavelength 589.3 nm
	1.805 @Wavelength 587.6 nm
	1.812 @Wavelength 546.1 nm
	1.827 @Wavelength 486.1 nm
	1.829 @Wavelength 480 nm
	1.847 @Wavelength 435.8 nm
	1.865 @Wavelength 404.7 nm
Abbe Number	25.16	ve
	25.36	vd
Optical Dispersion	0.03175	nf - nc
	0.032304	nf' - nc'
Transmission, Visible	84.5 % @Thickness 10.0 mm, Wavelength 420 nm
	86.9 % @Thickness 25.0 mm, Wavelength 420 nm
	90.6 % @Thickness 25.0 mm, Wavelength 436 nm
	93.2 % @Thickness 25.0 mm, Wavelength 460 nm
	96 % @Thickness 25.0 mm, Wavelength 500 nm
	96.1 % @Thickness 10.0 mm, Wavelength 436 nm
	97.2 % @Thickness 10.0 mm, Wavelength 460 nm
	97.8 % @Thickness 25.0 mm, Wavelength 660 nm
	98 % @Thickness 25.0 mm, Wavelength 620 nm
	98.1 % @Thickness 25.0 mm, Wavelength 546 nm
	98.4 % @Thickness 10.0 mm, Wavelength 500 nm
	98.4 % @Thickness 25.0 mm, Wavelength 700 nm
	98.4 % @Thickness 25.0 mm, Wavelength 580 nm
	99.1 % @Thickness 10.0 mm, Wavelength 660 nm
	99.2 % @Thickness 10.0 mm, Wavelength 620 nm
	99.2 % @Thickness 10.0 mm, Wavelength 546 nm
	99.4 % @Thickness 10.0 mm, Wavelength 580 nm
	99.4 % @Thickness 10.0 mm, Wavelength 700 nm
IR Transmittance	56.5 % @Thickness 25.0 mm, Wavelength 2500 nm
	62 % @Thickness 25.0 mm, Wavelength 2325 nm
	79.6 % @Thickness 10.0 mm, Wavelength 2500 nm
	82.6 % @Thickness 10.0 mm, Wavelength 2325 nm
	87.6 % @Thickness 25.0 mm, Wavelength 1970 nm
	94.8 % @Thickness 10.0 mm, Wavelength 1970 nm
	98.1 % @Thickness 25.0 mm, Wavelength 1530 nm
	99.2 % @Thickness 10.0 mm, Wavelength 1530 nm
	99.9 % @Thickness 10.0 mm, Wavelength 1060 nm
	99.9 % @Thickness 25.0 mm, Wavelength 1060 nm
UV Transmittance	0.283 % @Thickness 25.0 mm, Wavelength 380 nm
	0.40 % @Thickness 10.0 mm, Wavelength 365 nm
	0.581 % @Thickness 25.0 mm, Wavelength 390 nm
	0.742 % @Thickness 25.0 mm, Wavelength 400 nm
	0.79 % @Thickness 25.0 mm, Wavelength 405 nm
	2.2 % @Thickness 25.0 mm, Wavelength 370 nm
	21.7 % @Thickness 10.0 mm, Wavelength 370 nm
	60.4 % @Thickness 10.0 mm, Wavelength 380 nm
	80.5 % @Thickness 10.0 mm, Wavelength 390 nm
	88.7 % @Thickness 10.0 mm, Wavelength 400 nm
	91 % @Thickness 10.0 mm, Wavelength 405 nm

Descriptive Properties
Climatic resistance	1
Grindability	4	according to JOGIS
Phosphate resistance	1
Stress optical coefficient	2.82	[10^-6mm²/N]
Yield point/sag temperature	468°C

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