Schott P-LAK35 693532.385, Optical Glass

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Schott P-LAK35 693532.385, Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Information provided by SCHOTT.
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Physical Properties	Original Value	Comments

Density	3.85 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	53.3
Alkali Class, AR	1.3
Stain Resistance Class, FR	5.0

Mechanical Properties	Original Value	Comments
Hardness, Knoop	616	HK (0.1/20)
Modulus of Elasticity	101 GPa
Poissons Ratio	0.289
Shear Modulus	39.2 GPa	Calculated

Thermal Properties	Original Value	Comments
CTE, linear	8.10 µm/m-°C @Temperature -30.0 - 70.0 °C
	9.70 µm/m-°C @Temperature 20.0 - 300 °C
Specific Heat Capacity	0.630 J/g-°C
Thermal Conductivity	0.720 W/m-K
Transformation Temperature, Tg	508 °C
Softening Point	598 °C	viscosity of 10^7.6 cP
Annealing Point	511 °C	viscosity of 10¹³ cP

Optical Properties	Original Value	Comments
Refractive Index	1.657 @Wavelength 2323.4 nm
	1.664 @Wavelength 1970.1 nm
	1.671 @Wavelength 1529.6 nm
	1.678 @Wavelength 1060 nm
	1.679 @Wavelength 1014 nm
	1.682 @Wavelength 852.1 nm
	1.687 @Wavelength 706.5 nm
	1.69 @Wavelength 632.8 nm
	1.69 @Wavelength 643.8 nm
	1.693 @Wavelength 587.6 nm
	1.693 @Wavelength 589.3 nm
	1.695 @Wavelength 656.3 nm
	1.696 @Wavelength 546.1 nm
	1.702 @Wavelength 486.1 nm
	1.703 @Wavelength 480 nm
	1.707 @Wavelength 435.8 nm
	1.715 @Wavelength 404.7 nm
	1.725 @Wavelength 365 nm
	1.736 @Wavelength 334.1 nm
Abbe Number	52.95	ve
	53.2	vd
Optical Dispersion	0.013036	nf - nc
	0.013156	nf' - nc'
Transmission, Visible	97.7 % @Thickness 25.0 mm, Wavelength 420 nm
	98 % @Thickness 25.0 mm, Wavelength 436 nm
	98.5 % @Thickness 25.0 mm, Wavelength 460 nm
	99.2 % @Thickness 25.0 mm, Wavelength 620 nm
	99.2 % @Thickness 10.0 mm, Wavelength 420 nm
	99.2 % @Thickness 25.0 mm, Wavelength 660 nm
	99.2 % @Thickness 25.0 mm, Wavelength 500 nm
	99.3 % @Thickness 25.0 mm, Wavelength 700 nm
	99.3 % @Thickness 25.0 mm, Wavelength 580 nm
	99.4 % @Thickness 25.0 mm, Wavelength 546 nm
	99.4 % @Thickness 10.0 mm, Wavelength 436 nm
	99.7 % @Thickness 10.0 mm, Wavelength 620 nm
	99.7 % @Thickness 10.0 mm, Wavelength 460 nm
	99.7 % @Thickness 10.0 mm, Wavelength 546 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 580 nm
	99.8 % @Thickness 10.0 mm, Wavelength 500 nm
IR Transmittance	22 % @Thickness 25.0 mm, Wavelength 2500 nm
	50 % @Thickness 25.0 mm, Wavelength 2325 nm
	75.8 % @Thickness 10.0 mm, Wavelength 2325 nm
	84.6 % @Thickness 10.0 mm, Wavelength 2500 nm
	87 % @Thickness 25.0 mm, Wavelength 1970 nm
	94.6 % @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	0.50 % @Thickness 25.0 mm, Wavelength 300 nm
	2.6 % @Thickness 10.0 mm, Wavelength 290 nm
	6.0 % @Thickness 25.0 mm, Wavelength 310 nm
	15.8 % @Thickness 10.0 mm, Wavelength 300 nm
	21 % @Thickness 25.0 mm, Wavelength 320 nm
	35.3 % @Thickness 10.0 mm, Wavelength 310 nm
	48 % @Thickness 25.0 mm, Wavelength 334 nm
	53.6 % @Thickness 10.0 mm, Wavelength 320 nm
	74 % @Thickness 25.0 mm, Wavelength 350 nm
	74.6 % @Thickness 10.0 mm, Wavelength 334 nm
	88 % @Thickness 25.0 mm, Wavelength 365 nm
	88.7 % @Thickness 10.0 mm, Wavelength 350 nm
	90.7 % @Thickness 25.0 mm, Wavelength 370 nm
	94 % @Thickness 25.0 mm, Wavelength 380 nm
	95 % @Thickness 10.0 mm, Wavelength 365 nm
	96 % @Thickness 25.0 mm, Wavelength 390 nm
	96.2 % @Thickness 10.0 mm, Wavelength 370 nm
	97 % @Thickness 25.0 mm, Wavelength 400 nm
	97.3 % @Thickness 25.0 mm, Wavelength 405 nm
	98.4 % @Thickness 10.0 mm, Wavelength 380 nm
	98.8 % @Thickness 10.0 mm, Wavelength 390 nm
	98.9 % @Thickness 10.0 mm, Wavelength 400 nm
	99.1 % @Thickness 10.0 mm, Wavelength 405 nm

Descriptive Properties
Acid resistance class	4	according to JOGIS
Climatic resistance	2
Grindability	119	according to JOGIS
Phosphate resistance	4.3
Stress optical coefficient	1.76	[10^-6mm²/N]
Water resistance class	3	according to JOGIS
Yield point/sag temperature	544°C

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