Ohara S-LAL 8 Optical Glass

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Ohara S-LAL 8 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	3.79 g/cc	3.79 g/cc

Chemical Properties	Metric	English	Comments
Acid Class, SR	52	52

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	660 @Load 0.0999 kg	660 @Load 0.220 lb
Modulus of Elasticity	114.0 GPa	16530 ksi
Modulus of Rigidity	44.2 GPa	6410 ksi
Poissons Ratio	0.289	0.289
Abrasion	81	81	Aa

Thermal Properties	Metric	English	Comments
CTE, linear	6.10 µm/m-°C @Temperature -30.0 - 70.0 °C	3.39 µin/in-°F @Temperature -22.0 - 158 °F
	7.40 µm/m-°C @Temperature 100 - 300 °C	4.11 µin/in-°F @Temperature 212 - 572 °F
Thermal Conductivity	0.894 W/m-K @Temperature 35.0 °C	6.20 BTU-in/hr-ft²-°F @Temperature 95.0 °F
Transformation Temperature, Tg	643 °C	1190 °F	per thermal expansion curve
Softening Point	698 °C	1290 °F	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	617 °C	1140 °F	10¹³ poise; ASTM-C336
Strain Point	590 °C	1090 °F	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Metric	English	Comments
Refractive Index	1.67418 @Wavelength 2325.42 nm	1.67418 @Wavelength 2325.42 nm
	1.68155 @Wavelength 1970.09 nm	1.68155 @Wavelength 1970.09 nm
	1.68930 @Wavelength 1529.58 nm	1.68930 @Wavelength 1529.58 nm
	1.69597 @Wavelength 1128.64 nm	1.69597 @Wavelength 1128.64 nm
	1.69813 @Wavelength 1013.98 nm	1.69813 @Wavelength 1013.98 nm	nt (Hg t line)
	1.70186 @Wavelength 852.11 nm	1.70186 @Wavelength 852.11 nm	ns (Cs s line)
	1.70438 @Wavelength 768.19 nm	1.70438 @Wavelength 768.19 nm	nA' (K A' line)
	1.70669 @Wavelength 706.52 nm	1.70669 @Wavelength 706.52 nm	nr (He r line)
	1.70897 @Wavelength 656.27 nm	1.70897 @Wavelength 656.27 nm	nC (H C line)
	1.70961 @Wavelength 643.85 nm	1.70961 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.71021 @Wavelength 632.8 nm	1.71021 @Wavelength 632.8 nm	nHe-Ne
	1.71288 @Wavelength 589.29 nm	1.71288 @Wavelength 589.29 nm	nD (Na D line)
	1.71300 @Wavelength 587.56 nm	1.71300 @Wavelength 587.56 nm	nd (He D line)
	1.71615 @Wavelength 546.07 nm	1.71615 @Wavelength 546.07 nm	ne (Hg e line)
	1.72221 @Wavelength 486.13 nm	1.72221 @Wavelength 486.13 nm	nf (H F line)
	1.72297 @Wavelength 479.99 nm	1.72297 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.72848 @Wavelength 441.57 nm	1.72848 @Wavelength 441.57 nm	nHe-Cd
	1.72943 @Wavelength 435.835 nm	1.72943 @Wavelength 435.835 nm	ng (Hg g line)
	1.73545 @Wavelength 404.656 nm	1.73545 @Wavelength 404.656 nm	nh (Hg h line)
	1.74575 @Wavelength 365.015 nm	1.74575 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	53.64	53.64	ν e
	53.87	53.87	ν d
Optical Dispersion	0.004021	0.004021	nd-nC; Partial Dispersion
	0.004591	0.004591	nC-nA'; Partial Dispersion
	0.006016	0.006016	nh-ng; Partial Dispersion
	0.006536	0.006536	ne-nC'; Partial Dispersion
	0.006816	0.006816	nF'-ne; Partial Dispersion
	0.007176	0.007176	ne-nC; Partial Dispersion
	0.007225	0.007225	ng-nF; Partial Dispersion
	0.010846	0.010846	nC-nt; Partial Dispersion
	0.011486	0.011486	nC'-nt; Partial Dispersion
	0.013236	0.013236	nF-nC
	0.013352	0.013352	nF'-nC'
	0.016311	0.016311	ni-ng; Partial Dispersion
	0.01644	0.01644	ng-nd; Partial Dispersion
	0.02278	0.02278	ni-nF'; Partial Dispersion
Transmission, Visible	94.4 % @Wavelength 380 nm	94.4 % @Wavelength 380 nm
	96.5 % @Wavelength 390 nm	96.5 % @Wavelength 390 nm
	97.7 % @Wavelength 400 nm	97.7 % @Wavelength 400 nm
	98.8 % @Wavelength 420 nm	98.8 % @Wavelength 420 nm
	99.1 % @Wavelength 440 nm	99.1 % @Wavelength 440 nm
	99.4 % @Wavelength 460 nm	99.4 % @Wavelength 460 nm
	99.6 % @Wavelength 480 nm	99.6 % @Wavelength 480 nm
	99.6 % @Wavelength 600 nm	99.6 % @Wavelength 600 nm
	99.7 % @Wavelength 500 nm	99.7 % @Wavelength 500 nm
	99.7 % @Wavelength 650 nm	99.7 % @Wavelength 650 nm
	99.7 % @Wavelength 700 nm	99.7 % @Wavelength 700 nm
	99.8 % @Wavelength 550 nm	99.8 % @Wavelength 550 nm
IR Transmittance	62 % @Wavelength 2400 nm	62 % @Wavelength 2400 nm
	87 % @Wavelength 2200 nm	87 % @Wavelength 2200 nm
	98.1 % @Wavelength 1800 nm	98.1 % @Wavelength 1800 nm
	99.1 % @Wavelength 1400 nm	99.1 % @Wavelength 1400 nm
	99.1 % @Wavelength 1600 nm	99.1 % @Wavelength 1600 nm
	99.7 % @Wavelength 900 nm	99.7 % @Wavelength 900 nm
	99.7 % @Wavelength 1000 nm	99.7 % @Wavelength 1000 nm
	99.7 % @Wavelength 1200 nm	99.7 % @Wavelength 1200 nm
	99.8 % @Wavelength 800 nm	99.8 % @Wavelength 800 nm
UV Transmittance	3.0 % @Wavelength 290 nm	3.0 % @Wavelength 290 nm
	7.0 % @Wavelength 300 nm	7.0 % @Wavelength 300 nm
	15 % @Wavelength 310 nm	15 % @Wavelength 310 nm
	28 % @Wavelength 320 nm	28 % @Wavelength 320 nm
	44 % @Wavelength 330 nm	44 % @Wavelength 330 nm
	60 % @Wavelength 340 nm	60 % @Wavelength 340 nm
	74 % @Wavelength 350 nm	74 % @Wavelength 350 nm
	84 % @Wavelength 360 nm	84 % @Wavelength 360 nm
	90.5 % @Wavelength 370 nm	90.5 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	4
CCI	0.00 B
	0.42 G
	0.42 R
coloring, λ 5	295
coloring, λ 80	375
Coloring, Internal Transmission λ 0.05	295
Coloring, Internal Transmission λ 0.80	356
Knoop Hardness Class	7
Melt Frequency	1
Ohara Code d	713539
Ohara Code e	716536
Ohara Status	Preferred
Phosphate Resistance, PR	3
Photoelastic Constant (ß)	1.75
Relative Price	5		S-BSL7 = 1
Water Resistance, RW(P)	2
Weathering Resistance (Surface Method) W(S)max	3
Yield Point, At (°C)	668		per thermal expansion curve

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