Schott N-FK5 Glass

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Schott N-FK5 Glass
Categories:	Ceramic; Glass
Material Notes:	Suitable for precision molding Information Provided by SCHOTT North America, Inc.
Key Words:	487704.245
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Physical Properties	Original Value	Comments

Density	2.45 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	4.0
Alkali Class, AR	2.0
Stain Resistance Class, FR	1.0

Mechanical Properties	Original Value	Comments
Knoop Microhardness	520	.1/20
Modulus of Elasticity	62.0 GPa
Poissons Ratio	0.232
Shear Modulus	25.0 GPa	calculated

Thermal Properties	Original Value	Comments
CTE, linear	9.20 µm/m-°C @Temperature -30.0 - 70.0 °C
	10.0 µm/m-°C @Temperature 20.0 - 300 °C
Specific Heat Capacity	0.808 J/g-°C
Thermal Conductivity	0.925 W/m-K
Transformation Temperature, Tg	466 °C
Softening Point	672 °C	Viscosity 10^7.6 dPa s
Annealing Point	469 °C	Viscosity 10^13.0 dPa s

Optical Properties	Original Value	Comments
Refractive Index	1.48749 @Wavelength 587.6 nm	n_d
	1.48914 @Wavelength 546.1 nm	n_e
Abbe Number	70.23	ve
	70.41	vd
Optical Dispersion	0.006924	nf - nc
	0.006965	nf' - nc'
Transmission, Visible	99.6 % @Thickness 10.0 mm, Wavelength 380 nm
	99.7 % @Thickness 10.0 mm, Wavelength 460 nm
	99.8 % @Thickness 10.0 mm, Wavelength 580 nm
	99.8 % @Thickness 10.0 mm, Wavelength 700 nm
	99.8 % @Thickness 10.0 mm, Wavelength 405 nm
IR Transmittance	67.9 % @Thickness 10.0 mm, Wavelength 2500 nm
	98.6 % @Thickness 10.0 mm, Wavelength 1530 nm
UV Transmittance	7.0 % @Thickness 10.0 mm, Wavelength 270 nm
	86.7 % @Thickness 10.0 mm, Wavelength 300 nm
	98.9 % @Thickness 10.0 mm, Wavelength 334 nm
	99.7 % @Thickness 10.0 mm, Wavelength 370 nm

Descriptive Properties
B	1
Climatic Resistance Test CR	2
HG	3
K (10^-6mm²/N)	2.91
Phosphate Resistance PR	2.3

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