Ohara S-LAL18 Optical Glass

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Ohara S-LAL18 Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	ECO optical glass that does not contain any lead or arsenic. Information provided by Ohara Corporation.
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Physical Properties	Metric	English	Comments

Specific Gravity	4.18 g/cc	4.18 g/cc

Chemical Properties	Metric	English	Comments
Acid Class, SR	51.2	51.2

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	720 @Load 0.0999 kg	720 @Load 0.220 lb
Modulus of Elasticity	120.4 GPa	17460 ksi
Modulus of Rigidity	46.7 GPa	6770 ksi
Poissons Ratio	0.289	0.289
Abrasion	70	70	Aa

Thermal Properties	Metric	English	Comments
CTE, linear	5.90 µm/m-°C @Temperature -30.0 - 70.0 °C	3.28 µin/in-°F @Temperature -22.0 - 158 °F
	6.90 µm/m-°C @Temperature 100 - 300 °C	3.83 µin/in-°F @Temperature 212 - 572 °F
Thermal Conductivity	0.871 W/m-K @Temperature 35.0 °C	6.04 BTU-in/hr-ft²-°F @Temperature 95.0 °F
Transformation Temperature, Tg	685 °C	1270 °F	per thermal expansion curve
Softening Point	731 °C	1350 °F	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	655 °C	1210 °F	10¹³ poise; ASTM-C336
Strain Point	632 °C	1170 °F	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Metric	English	Comments
Refractive Index	1.68936 @Wavelength 2325.42 nm	1.68936 @Wavelength 2325.42 nm
	1.69701 @Wavelength 1970.09 nm	1.69701 @Wavelength 1970.09 nm
	1.70504 @Wavelength 1529.58 nm	1.70504 @Wavelength 1529.58 nm
	1.71190 @Wavelength 1128.64 nm	1.71190 @Wavelength 1128.64 nm
	1.71411 @Wavelength 1013.98 nm	1.71411 @Wavelength 1013.98 nm	nt (Hg t line)
	1.71790 @Wavelength 852.11 nm	1.71790 @Wavelength 852.11 nm	ns (Cs s line)
	1.72046 @Wavelength 768.19 nm	1.72046 @Wavelength 768.19 nm	nA' (K A' line)
	1.72279 @Wavelength 706.52 nm	1.72279 @Wavelength 706.52 nm	nr (He r line)
	1.72510 @Wavelength 656.27 nm	1.72510 @Wavelength 656.27 nm	nC (H C line)
	1.72575 @Wavelength 643.85 nm	1.72575 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.72635 @Wavelength 632.8 nm	1.72635 @Wavelength 632.8 nm	nHe-Ne
	1.72904 @Wavelength 589.29 nm	1.72904 @Wavelength 589.29 nm	nD (Na D line)
	1.72916 @Wavelength 587.56 nm	1.72916 @Wavelength 587.56 nm	nd (He D line)
	1.73234 @Wavelength 546.07 nm	1.73234 @Wavelength 546.07 nm	ne (Hg e line)
	1.73844 @Wavelength 486.13 nm	1.73844 @Wavelength 486.13 nm	nf (H F line)
	1.73920 @Wavelength 479.99 nm	1.73920 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.74473 @Wavelength 441.57 nm	1.74473 @Wavelength 441.57 nm	nHe-Cd
	1.74570 @Wavelength 435.835 nm	1.74570 @Wavelength 435.835 nm	ng (Hg g line)
	1.75173 @Wavelength 404.656 nm	1.75173 @Wavelength 404.656 nm	nh (Hg h line)
	1.76203 @Wavelength 365.015 nm	1.76203 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	54.45	54.45	ν e
	54.68	54.68	ν d
Optical Dispersion	0.004056	0.004056	nd-nC; Partial Dispersion
	0.004641	0.004641	nC-nA'; Partial Dispersion
	0.006035	0.006035	nh-ng; Partial Dispersion
	0.006589	0.006589	ne-nC'; Partial Dispersion
	0.00686	0.00686	nF'-ne; Partial Dispersion
	0.007235	0.007235	ne-nC; Partial Dispersion
	0.00726	0.00726	ng-nF; Partial Dispersion
	0.010994	0.010994	nC-nt; Partial Dispersion
	0.01164	0.01164	nC'-nt; Partial Dispersion
	0.013335	0.013335	nF-nC
	0.013449	0.013449	nF'-nC'
	0.016335	0.016335	ni-ng; Partial Dispersion
	0.016539	0.016539	ng-nd; Partial Dispersion
	0.022835	0.022835	ni-nF'; Partial Dispersion
Transmission, Visible	96.7 % @Wavelength 380 nm	96.7 % @Wavelength 380 nm
	97.8 % @Wavelength 390 nm	97.8 % @Wavelength 390 nm
	98.4 % @Wavelength 400 nm	98.4 % @Wavelength 400 nm
	99.1 % @Wavelength 420 nm	99.1 % @Wavelength 420 nm
	99.4 % @Wavelength 440 nm	99.4 % @Wavelength 440 nm
	99.6 % @Wavelength 460 nm	99.6 % @Wavelength 460 nm
	99.7 % @Wavelength 480 nm	99.7 % @Wavelength 480 nm
	99.8 % @Wavelength 500 nm	99.8 % @Wavelength 500 nm
	99.8 % @Wavelength 600 nm	99.8 % @Wavelength 600 nm
	99.9 % @Wavelength 550 nm	99.9 % @Wavelength 550 nm
	99.9 % @Wavelength 650 nm	99.9 % @Wavelength 650 nm
	99.9 % @Wavelength 700 nm	99.9 % @Wavelength 700 nm
IR Transmittance	60 % @Wavelength 2400 nm	60 % @Wavelength 2400 nm
	87 % @Wavelength 2200 nm	87 % @Wavelength 2200 nm
	98.2 % @Wavelength 1800 nm	98.2 % @Wavelength 1800 nm
	99.1 % @Wavelength 1400 nm	99.1 % @Wavelength 1400 nm
	99.1 % @Wavelength 1600 nm	99.1 % @Wavelength 1600 nm
	99.6 % @Wavelength 1200 nm	99.6 % @Wavelength 1200 nm
	99.7 % @Wavelength 1000 nm	99.7 % @Wavelength 1000 nm
	99.8 % @Wavelength 800 nm	99.8 % @Wavelength 800 nm
	99.8 % @Wavelength 900 nm	99.8 % @Wavelength 900 nm
UV Transmittance	4.0 % @Wavelength 280 nm	4.0 % @Wavelength 280 nm
	21 % @Wavelength 290 nm	21 % @Wavelength 290 nm
	30 % @Wavelength 300 nm	30 % @Wavelength 300 nm
	32 % @Wavelength 310 nm	32 % @Wavelength 310 nm
	55 % @Wavelength 320 nm	55 % @Wavelength 320 nm
	68 % @Wavelength 330 nm	68 % @Wavelength 330 nm
	78 % @Wavelength 340 nm	78 % @Wavelength 340 nm
	86 % @Wavelength 350 nm	86 % @Wavelength 350 nm
	91.2 % @Wavelength 360 nm	91.2 % @Wavelength 360 nm
	94.6 % @Wavelength 370 nm	94.6 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	4
CCI	0.00 B
	0.3 G
	0.3 R
coloring, λ 5	280
coloring, λ 80	365
Coloring, Internal Transmission λ 0.05	281
Coloring, Internal Transmission λ 0.80	343
Knoop Hardness Class	7
Melt Frequency	1
Ohara Code d	729547
Ohara Code e	732544
Ohara Status	Preferred
Phosphate Resistance, PR	2
Photoelastic Constant (ß)	1.58
Relative Price	11.5		S-BSL7 = 1
Water Resistance, RW(P)	1
Weathering Resistance (Surface Method) W(S)max	1
Yield Point, At (°C)	699		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.

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CZOHARA900 / 192165

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