Ohara S-LAL20 Optical Glass

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Ohara S-LAL20 Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	S-LAL20 is an optical glass with negative dn/dT. In Automotive camera lens systems, the focal length is often a fixed distance. Refractive index fluctuations within the optical system should certainly be a consideration, as cars are used in environments where the temperature range can vary widely from below zero in colder climates to more that 50°C inside a car on a summer day. Since many optical glasses have positive dn/dT values, the refractive indices fluctuations due to temperature change can be adjusted efficiently when these materials are combined with S-LAL20. In addition to Automotive camera lens systems, S-LAL20 can also be used for Projectors, Interchangeable Photographic lenses, and various other applications. Information provided by Ohara Corporation.
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Physical Properties	Metric	English	Comments

Specific Gravity	4.38 g/cc	4.38 g/cc

Chemical Properties	Metric	English	Comments
Acid Class, SR	53.1	53.1

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	490 @Load 0.0999 kg	490 @Load 0.220 lb
Modulus of Elasticity	78.7 GPa	11400 ksi
Modulus of Rigidity	30.2 GPa	4380 ksi
Poissons Ratio	0.302	0.302
Abrasion	254	254	Aa

Thermal Properties	Metric	English	Comments
CTE, linear	9.00 µm/m-°C @Temperature -30.0 - 70.0 °C	5.00 µin/in-°F @Temperature -22.0 - 158 °F
	10.5 µm/m-°C @Temperature 100 - 300 °C	5.83 µin/in-°F @Temperature 212 - 572 °F
Thermal Conductivity	0.602 W/m-K @Temperature 35.0 °C	4.18 BTU-in/hr-ft²-°F @Temperature 95.0 °F
Transformation Temperature, Tg	628 °C	1160 °F	per thermal expansion curve
Softening Point	717 °C	1320 °F	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	621 °C	1150 °F	10¹³ poise; ASTM-C336
Strain Point	593 °C	1100 °F	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Metric	English	Comments
Refractive Index	1.66804 @Wavelength 2325.42 nm	1.66804 @Wavelength 2325.42 nm
	1.6727 @Wavelength 1970.09 nm	1.6727 @Wavelength 1970.09 nm
	1.67791 @Wavelength 1529.58 nm	1.67791 @Wavelength 1529.58 nm
	1.68297 @Wavelength 1128.64 nm	1.68297 @Wavelength 1128.64 nm
	1.68481 @Wavelength 1013.98 nm	1.68481 @Wavelength 1013.98 nm	nt (Hg t line)
	1.6882 @Wavelength 852.11 nm	1.6882 @Wavelength 852.11 nm	ns (Cs s line)
	1.69063 @Wavelength 768.19 nm	1.69063 @Wavelength 768.19 nm	nA' (K A' line)
	1.6929 @Wavelength 706.52 nm	1.6929 @Wavelength 706.52 nm	nr (He r line)
	1.6952 @Wavelength 656.27 nm	1.6952 @Wavelength 656.27 nm	nC (H C line)
	1.69584 @Wavelength 643.85 nm	1.69584 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.69645 @Wavelength 632.8 nm	1.69645 @Wavelength 632.8 nm	nHe-Ne
	1.69918 @Wavelength 589.29 nm	1.69918 @Wavelength 589.29 nm	nD
	1.6993 @Wavelength 587.56 nm	1.6993 @Wavelength 587.56 nm	nd (He D line)
	1.70256 @Wavelength 546.07 nm	1.70256 @Wavelength 546.07 nm	ne (Hg e line)
	1.70888 @Wavelength 486.13 nm	1.70888 @Wavelength 486.13 nm	nf (H F line)
	1.70967 @Wavelength 479.99 nm	1.70967 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.71546 @Wavelength 441.57 nm	1.71546 @Wavelength 441.57 nm	nHe-Cd
	1.71647 @Wavelength 435.835 nm	1.71647 @Wavelength 435.835 nm	ng (Hg g line)
	1.72283 @Wavelength 404.656 nm	1.72283 @Wavelength 404.656 nm	nh (Hg h line)
	1.73376 @Wavelength 365.015 nm	1.73376 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	50.82	50.82	ν e
	51.11	51.11	ν d
Optical Dispersion	0.004104	0.004104	nd-nC; Partial Dispersion
	0.00457	0.00457	nC-nA'; Partial Dispersion
	0.006359	0.006359	nh-ng; Partial Dispersion
	0.006714	0.006714	ne-nC'; Partial Dispersion
	0.007111	0.007111	nF'-ne; Partial Dispersion
	0.007363	0.007363	ne-nC; Partial Dispersion
	0.007596	0.007596	ng-nF; Partial Dispersion
	0.010389	0.010389	nC-nt; Partial Dispersion
	0.011038	0.011038	nC'-nt; Partial Dispersion
	0.013682	0.013682	nF-nC
	0.013825	0.013825	nF'-nC'
	0.017174	0.017174	ng-nd; Partial Dispersion
	0.01729	0.01729	ni-ng; Partial Dispersion
	0.024094	0.024094	ni-nF'; Partial Dispersion
Transmission, Visible	96 % @Thickness 10.0 mm, Wavelength 380 nm	96 % @Thickness 0.394 in, Wavelength 380 nm	Internal Transmission
	97.4 % @Thickness 10.0 mm, Wavelength 390 nm	97.4 % @Thickness 0.394 in, Wavelength 390 nm	Internal Transmission
	98.2 % @Thickness 10.0 mm, Wavelength 400 nm	98.2 % @Thickness 0.394 in, Wavelength 400 nm	Internal Transmission
	98.7 % @Thickness 10.0 mm, Wavelength 420 nm	98.7 % @Thickness 0.394 in, Wavelength 420 nm	Internal Transmission
	98.7 % @Thickness 10.0 mm, Wavelength 440 nm	98.7 % @Thickness 0.394 in, Wavelength 440 nm	Internal Transmission
	98.9 % @Thickness 10.0 mm, Wavelength 460 nm	98.9 % @Thickness 0.394 in, Wavelength 460 nm	Internal Transmission
	99.2 % @Thickness 10.0 mm, Wavelength 480 nm	99.2 % @Thickness 0.394 in, Wavelength 480 nm	Internal Transmission
	99.4 % @Thickness 10.0 mm, Wavelength 500 nm	99.4 % @Thickness 0.394 in, Wavelength 500 nm	Internal Transmission
	99.4 % @Thickness 10.0 mm, Wavelength 650 nm	99.4 % @Thickness 0.394 in, Wavelength 650 nm	Internal Transmission
	99.5 % @Thickness 10.0 mm, Wavelength 600 nm	99.5 % @Thickness 0.394 in, Wavelength 600 nm	Internal Transmission
	99.6 % @Thickness 10.0 mm, Wavelength 550 nm	99.6 % @Thickness 0.394 in, Wavelength 550 nm	Internal Transmission
	99.6 % @Thickness 10.0 mm, Wavelength 700 nm	99.6 % @Thickness 0.394 in, Wavelength 700 nm	Internal Transmission
IR Transmittance	84 % @Thickness 10.0 mm, Wavelength 2400 nm	84 % @Thickness 0.394 in, Wavelength 2400 nm	Internal Transmission
	93.5 % @Thickness 10.0 mm, Wavelength 2200 nm	93.5 % @Thickness 0.394 in, Wavelength 2200 nm	Internal Transmission
	96.9 % @Thickness 10.0 mm, Wavelength 2000 nm	96.9 % @Thickness 0.394 in, Wavelength 2000 nm	Internal Transmission
	98.5 % @Thickness 10.0 mm, Wavelength 1800 nm	98.5 % @Thickness 0.394 in, Wavelength 1800 nm	Internal Transmission
	99.5 % @Thickness 10.0 mm, Wavelength 1600 nm	99.5 % @Thickness 0.394 in, Wavelength 1600 nm	Internal Transmission
	99.7 % @Thickness 10.0 mm, Wavelength 900 nm	99.7 % @Thickness 0.394 in, Wavelength 900 nm	Internal Transmission
	99.7 % @Thickness 10.0 mm, Wavelength 1000 nm	99.7 % @Thickness 0.394 in, Wavelength 1000 nm	Internal Transmission
	99.7 % @Thickness 10.0 mm, Wavelength 1400 nm	99.7 % @Thickness 0.394 in, Wavelength 1400 nm	Internal Transmission
	99.8 % @Thickness 10.0 mm, Wavelength 800 nm	99.8 % @Thickness 0.394 in, Wavelength 800 nm	Internal Transmission
	99.8 % @Thickness 10.0 mm, Wavelength 1200 nm	99.8 % @Thickness 0.394 in, Wavelength 1200 nm	Internal Transmission
UV Transmittance	1.0 % @Thickness 10.0 mm, Wavelength 300 nm	1.0 % @Thickness 0.394 in, Wavelength 300 nm	Internal Transmission
	9.0 % @Thickness 10.0 mm, Wavelength 310 nm	9.0 % @Thickness 0.394 in, Wavelength 310 nm	Internal Transmission
	27 % @Thickness 10.0 mm, Wavelength 320 nm	27 % @Thickness 0.394 in, Wavelength 320 nm	Internal Transmission
	49 % @Thickness 10.0 mm, Wavelength 330 nm	49 % @Thickness 0.394 in, Wavelength 330 nm	Internal Transmission
	67 % @Thickness 10.0 mm, Wavelength 340 nm	67 % @Thickness 0.394 in, Wavelength 340 nm	Internal Transmission
	80 % @Thickness 10.0 mm, Wavelength 350 nm	80 % @Thickness 0.394 in, Wavelength 350 nm	Internal Transmission
	88 % @Thickness 10.0 mm, Wavelength 360 nm	88 % @Thickness 0.394 in, Wavelength 360 nm	Internal Transmission
	93.4 % @Thickness 10.0 mm, Wavelength 370 nm	93.4 % @Thickness 0.394 in, Wavelength 370 nm	Internal Transmission

Descriptive Properties
Acid Resistance, Powder Method, RA(P)	4
CCI	0.00 B
	0.4 G
	0.4 R
coloring, λ 5	310
coloring, λ 80	370
Coloring, Internal Transmission λ 0.05	305
Coloring, Internal Transmission λ 0.80	350
Knoop Hardness Class	5
Ohara Code d	699511
Ohara Code e	703508
Phosphate Resistance, PR	4.2
Photoelastic Constant (ß)	1.23
Water Resistance, RW(P)	2
Weathering Resistance (Surface Method) W(S)max	1
Yield Point, At (°C)	676		per thermal expansion curve

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

CZOHARA775 / 281614

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