Schott N-BK7HTi 517642.251, Optical Glass

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Schott N-BK7HTi 517642.251, Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Information provided by SCHOTT.
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Physical Properties	Original Value	Comments

Density	2.51 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	1.0
Alkali Class, AR	2.3
Stain Resistance Class, FR	0.00

Mechanical Properties	Original Value	Comments
Hardness, Knoop	610	HK (0.1/20)
Modulus of Elasticity	82.0 GPa
Poissons Ratio	0.206
Shear Modulus	34.0 GPa	Calculated

Thermal Properties	Original Value	Comments
CTE, linear	7.10 µm/m-°C @Temperature -30.0 - 70.0 °C
	8.30 µm/m-°C @Temperature 20.0 - 300 °C
Specific Heat Capacity	0.858 J/g-°C
Thermal Conductivity	1.114 W/m-K
Transformation Temperature, Tg	557 °C
Softening Point	719 °C	viscosity of 10^7.6 cP
Annealing Point	557 °C	viscosity of 10¹³ cP

Optical Properties	Original Value	Comments
Refractive Index	1.489 @Wavelength 2325.4 nm
	1.494 @Wavelength 1970.1 nm
	1.50 @Wavelength 1529.6 nm
	1.506 @Wavelength 1060 nm
	1.507 @Wavelength 1014 nm
	1.509 @Wavelength 852.1 nm
	1.512 @Wavelength 706.5 nm
	1.514 @Wavelength 656.3 nm
	1.514 @Wavelength 643.8 nm
	1.515 @Wavelength 632.8 nm
	1.516 @Wavelength 587.6 nm
	1.516 @Wavelength 589.3 nm
	1.518 @Wavelength 546.1 nm
	1.522 @Wavelength 486.1 nm
	1.522 @Wavelength 480 nm
	1.526 @Wavelength 435.8 nm
	1.53 @Wavelength 404.7 nm
	1.536 @Wavelength 365 nm
	1.542 @Wavelength 334.1 nm
	1.548 @Wavelength 312.6 nm
Abbe Number	63.96	ve
	64.17	vd
Optical Dispersion	0.008054	nf - nc
	0.00811	nf' - nc'
Transmission, Visible	99.6 % @Thickness 25.0 mm, Wavelength 420 nm
	99.6 % @Thickness 25.0 mm, Wavelength 436 nm
	99.6 % @Thickness 25.0 mm, Wavelength 460 nm
	99.7 % @Thickness 25.0 mm, Wavelength 620 nm
	99.7 % @Thickness 25.0 mm, Wavelength 660 nm
	99.7 % @Thickness 25.0 mm, Wavelength 500 nm
	99.8 % @Thickness 25.0 mm, Wavelength 546 nm
	99.8 % @Thickness 25.0 mm, Wavelength 700 nm
	99.8 % @Thickness 25.0 mm, Wavelength 580 nm
	99.8 % @Thickness 10.0 mm, Wavelength 460 nm
	99.8 % @Thickness 10.0 mm, Wavelength 436 nm
	99.8 % @Thickness 10.0 mm, Wavelength 420 nm
	99.9 % @Thickness 10.0 mm, Wavelength 620 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 546 nm
	99.9 % @Thickness 10.0 mm, Wavelength 500 nm
IR Transmittance	49 % @Thickness 25.0 mm, Wavelength 2500 nm
	65.7 % @Thickness 25.0 mm, Wavelength 2325 nm
	75.2 % @Thickness 10.0 mm, Wavelength 2500 nm
	84.5 % @Thickness 10.0 mm, Wavelength 2325 nm
	88.8 % @Thickness 25.0 mm, Wavelength 1970 nm
	95.4 % @Thickness 10.0 mm, Wavelength 1970 nm
	98.7 % @Thickness 25.0 mm, Wavelength 1530 nm
	99.5 % @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	2.3 % @Thickness 25.0 mm, Wavelength 300 nm
	4.0 % @Thickness 10.0 mm, Wavelength 290 nm
	22.1 % @Thickness 10.0 mm, Wavelength 300 nm
	24.2 % @Thickness 25.0 mm, Wavelength 310 nm
	56.7 % @Thickness 10.0 mm, Wavelength 310 nm
	60 % @Thickness 25.0 mm, Wavelength 320 nm
	81.5 % @Thickness 10.0 mm, Wavelength 320 nm
	87.5 % @Thickness 25.0 mm, Wavelength 334 nm
	94.8 % @Thickness 10.0 mm, Wavelength 334 nm
	96.4 % @Thickness 25.0 mm, Wavelength 350 nm
	98.5 % @Thickness 10.0 mm, Wavelength 350 nm
	98.5 % @Thickness 25.0 mm, Wavelength 365 nm
	98.9 % @Thickness 25.0 mm, Wavelength 370 nm
	99.2 % @Thickness 25.0 mm, Wavelength 380 nm
	99.4 % @Thickness 25.0 mm, Wavelength 390 nm
	99.4 % @Thickness 10.0 mm, Wavelength 365 nm
	99.6 % @Thickness 10.0 mm, Wavelength 370 nm
	99.6 % @Thickness 25.0 mm, Wavelength 405 nm
	99.6 % @Thickness 25.0 mm, Wavelength 400 nm
	99.7 % @Thickness 10.0 mm, Wavelength 380 nm
	99.8 % @Thickness 10.0 mm, Wavelength 400 nm
	99.8 % @Thickness 10.0 mm, Wavelength 390 nm
	99.8 % @Thickness 10.0 mm, Wavelength 405 nm

Descriptive Properties
Climatic resistance	1
Grindability	3	ISO 12844
Phosphate resistance	2.3
Stress optical coefficient	2.77	[10^-6mm²/N]

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