Schott SF57HT 847238.551, Optical Glass

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Schott SF57HT 847238.551, Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Information provided by SCHOTT.
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Physical Properties	Original Value	Comments

Density	5.51 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	52.3
Alkali Class, AR	2.3
Stain Resistance Class, FR	5.0

Mechanical Properties	Original Value	Comments
Hardness, Knoop	350	HK (0.1/20)
Modulus of Elasticity	54.0 GPa
Poissons Ratio	0.248
Shear Modulus	21.6 GPa	Calculated

Thermal Properties	Original Value	Comments
CTE, linear	8.30 µm/m-°C @Temperature -30.0 - 70.0 °C
	9.20 µm/m-°C @Temperature 20.0 - 300 °C
Specific Heat Capacity	0.360 J/g-°C
Thermal Conductivity	0.620 W/m-K
Transformation Temperature, Tg	414 °C
Softening Point	519 °C	viscosity of 10^7.6 cP
Annealing Point	391 °C	viscosity of 10¹³ cP

Optical Properties	Original Value	Comments
Refractive Index	1.79 @Wavelength 2325.4 nm
	1.795 @Wavelength 1970.1 nm
	1.801 @Wavelength 1529.6 nm
	1.811 @Wavelength 1060 nm
	1.813 @Wavelength 1014 nm
	1.82 @Wavelength 852.1 nm
	1.831 @Wavelength 706.5 nm
	1.836 @Wavelength 656.3 nm
	1.838 @Wavelength 643.8 nm
	1.839 @Wavelength 632.8 nm
	1.846 @Wavelength 589.3 nm
	1.846 @Wavelength 587.6 nm
	1.855 @Wavelength 546.1 nm
	1.872 @Wavelength 486.1 nm
	1.874 @Wavelength 480 nm
	1.893 @Wavelength 435.8 nm
	1.913 @Wavelength 404.7 nm
Abbe Number	23.64	ve
	23.83	vd
Optical Dispersion	0.035536	nf - nc
	0.036166	nf' - nc'
Transmission, Visible	91.2 % @Thickness 25.0 mm, Wavelength 420 nm
	95.4 % @Thickness 25.0 mm, Wavelength 436 nm
	96.4 % @Thickness 10.0 mm, Wavelength 420 nm
	97.6 % @Thickness 25.0 mm, Wavelength 460 nm
	98.1 % @Thickness 10.0 mm, Wavelength 436 nm
	99 % @Thickness 10.0 mm, Wavelength 460 nm
	99 % @Thickness 25.0 mm, Wavelength 500 nm
	99.6 % @Thickness 10.0 mm, Wavelength 500 nm
	99.6 % @Thickness 25.0 mm, Wavelength 546 nm
	99.7 % @Thickness 25.0 mm, Wavelength 580 nm
	99.7 % @Thickness 25.0 mm, Wavelength 700 nm
	99.7 % @Thickness 25.0 mm, Wavelength 620 nm
	99.7 % @Thickness 25.0 mm, Wavelength 660 nm
	99.8 % @Thickness 10.0 mm, Wavelength 546 nm
	99.9 % @Thickness 10.0 mm, Wavelength 580 nm
	99.9 % @Thickness 10.0 mm, Wavelength 700 nm
	99.9 % @Thickness 10.0 mm, Wavelength 660 nm
	99.9 % @Thickness 10.0 mm, Wavelength 620 nm
IR Transmittance	79.2 % @Thickness 25.0 mm, Wavelength 2500 nm
	91.1 % @Thickness 10.0 mm, Wavelength 2500 nm
	92.6 % @Thickness 25.0 mm, Wavelength 2325 nm
	92.7 % @Thickness 10.0 mm, Wavelength 2325 nm
	94.8 % @Thickness 25.0 mm, Wavelength 1970 nm
	97.9 % @Thickness 10.0 mm, Wavelength 1970 nm
	99.4 % @Thickness 25.0 mm, Wavelength 1530 nm
	99.8 % @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	8.0 % @Thickness 10.0 mm, Wavelength 365 nm
	23 % @Thickness 10.0 mm, Wavelength 370 nm
	25.3 % @Thickness 25.0 mm, Wavelength 380 nm
	26 % @Thickness 25.0 mm, Wavelength 370 nm
	55 % @Thickness 25.0 mm, Wavelength 390 nm
	57.7 % @Thickness 10.0 mm, Wavelength 380 nm
	76 % @Thickness 25.0 mm, Wavelength 400 nm
	78.7 % @Thickness 10.0 mm, Wavelength 390 nm
	81 % @Thickness 25.0 mm, Wavelength 405 nm
	89.6 % @Thickness 10.0 mm, Wavelength 400 nm
	91.9 % @Thickness 10.0 mm, Wavelength 405 nm

Descriptive Properties
Climatic resistance	2
Grindability	1	ISO 12844
Phosphate resistance	4.3
Stress optical coefficient	0.02	[10^-6mm²/N]

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CSGT9875 / 183128

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