Schott FK3 464658.227, Optical Glass

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Schott FK3 464658.227, Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Information provided by SCHOTT.
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Physical Properties	Original Value	Comments

Density	2.27 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	52.4
Alkali Class, AR	2.0
Stain Resistance Class, FR	3.0

Mechanical Properties	Original Value	Comments
Hardness, Knoop	380	HK (0.1/20)
Modulus of Elasticity	46.0 GPa
Poissons Ratio	0.243
Shear Modulus	18.5 GPa	Calculated

Thermal Properties	Original Value	Comments
CTE, linear	8.20 µm/m-°C @Temperature -30.0 - 70.0 °C
	9.40 µm/m-°C @Temperature 20.0 - 300 °C
Specific Heat Capacity	0.840 J/g-°C
Thermal Conductivity	0.900 W/m-K
Transformation Temperature, Tg	362 °C
Softening Point	622 °C	viscosity of 10^7.6 cP
Annealing Point	369 °C	viscosity of 10¹³ cP

Optical Properties	Original Value	Comments
Refractive Index	1.439 @Wavelength 2325.4 nm
	1.444 @Wavelength 1970.1 nm
	1.45 @Wavelength 1529.6 nm
	1.455 @Wavelength 1060 nm
	1.456 @Wavelength 1014 nm
	1.458 @Wavelength 852.1 nm
	1.461 @Wavelength 706.5 nm
	1.462 @Wavelength 656.3 nm
	1.463 @Wavelength 632.8 nm
	1.463 @Wavelength 643.8 nm
	1.464 @Wavelength 587.6 nm
	1.464 @Wavelength 589.3 nm
	1.466 @Wavelength 546.1 nm
	1.469 @Wavelength 486.1 nm
	1.469 @Wavelength 480 nm
	1.47 @Wavelength 365 nm
	1.473 @Wavelength 435.8 nm
	1.476 @Wavelength 404.7 nm
	1.487 @Wavelength 334.1 nm
	1.492 @Wavelength 312.6 nm
Abbe Number	65.57	ve
	65.77	vd
Optical Dispersion	0.007063	nf - nc
	0.00711	nf' - nc'
Transmission, Visible	98.7 % @Thickness 25.0 mm, Wavelength 420 nm
	98.9 % @Thickness 25.0 mm, Wavelength 436 nm
	99 % @Thickness 25.0 mm, Wavelength 460 nm
	99.3 % @Thickness 25.0 mm, Wavelength 620 nm
	99.3 % @Thickness 25.0 mm, Wavelength 660 nm
	99.3 % @Thickness 25.0 mm, Wavelength 700 nm
	99.3 % @Thickness 25.0 mm, Wavelength 500 nm
	99.3 % @Thickness 25.0 mm, Wavelength 580 nm
	99.3 % @Thickness 25.0 mm, Wavelength 546 nm
	99.5 % @Thickness 10.0 mm, Wavelength 420 nm
	99.6 % @Thickness 10.0 mm, Wavelength 460 nm
	99.6 % @Thickness 10.0 mm, Wavelength 436 nm
	99.7 % @Thickness 10.0 mm, Wavelength 546 nm
	99.7 % @Thickness 10.0 mm, Wavelength 580 nm
	99.7 % @Thickness 10.0 mm, Wavelength 500 nm
	99.7 % @Thickness 10.0 mm, Wavelength 700 nm
	99.7 % @Thickness 10.0 mm, Wavelength 660 nm
	99.7 % @Thickness 10.0 mm, Wavelength 620 nm
IR Transmittance	34 % @Thickness 25.0 mm, Wavelength 2500 nm
	59 % @Thickness 25.0 mm, Wavelength 2325 nm
	65 % @Thickness 10.0 mm, Wavelength 2500 nm
	81 % @Thickness 10.0 mm, Wavelength 2325 nm
	93 % @Thickness 25.0 mm, Wavelength 1970 nm
	97 % @Thickness 25.0 mm, Wavelength 1530 nm
	97.1 % @Thickness 10.0 mm, Wavelength 1970 nm
	98.8 % @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	5.0 % @Thickness 25.0 mm, Wavelength 300 nm
	19 % @Thickness 25.0 mm, Wavelength 310 nm
	30 % @Thickness 10.0 mm, Wavelength 300 nm
	41 % @Thickness 25.0 mm, Wavelength 320 nm
	51 % @Thickness 10.0 mm, Wavelength 310 nm
	70 % @Thickness 10.0 mm, Wavelength 320 nm
	74 % @Thickness 25.0 mm, Wavelength 334 nm
	89 % @Thickness 10.0 mm, Wavelength 334 nm
	89 % @Thickness 25.0 mm, Wavelength 350 nm
	95.4 % @Thickness 10.0 mm, Wavelength 350 nm
	96.4 % @Thickness 25.0 mm, Wavelength 365 nm
	97.1 % @Thickness 25.0 mm, Wavelength 370 nm
	98 % @Thickness 25.0 mm, Wavelength 380 nm
	98.4 % @Thickness 25.0 mm, Wavelength 390 nm
	98.5 % @Thickness 10.0 mm, Wavelength 365 nm
	98.5 % @Thickness 25.0 mm, Wavelength 400 nm
	98.6 % @Thickness 25.0 mm, Wavelength 405 nm
	98.8 % @Thickness 10.0 mm, Wavelength 370 nm
	99.2 % @Thickness 10.0 mm, Wavelength 380 nm
	99.4 % @Thickness 10.0 mm, Wavelength 390 nm
	99.4 % @Thickness 10.0 mm, Wavelength 400 nm
	99.4 % @Thickness 10.0 mm, Wavelength 405 nm

Descriptive Properties
Climatic resistance	2
Phosphate resistance	1
Stress optical coefficient	3.71	[10^-6mm²/N]

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