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	Original Value	Comments

Specific Gravity	3.79 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	52

Mechanical Properties	Original Value	Comments
Hardness, Knoop	660 @Load 0.0999 kg
Modulus of Elasticity	114.0 GPa
Modulus of Rigidity	44.2 GPa
Poissons Ratio	0.289
Abrasion	81	Aa

Thermal Properties	Original Value	Comments
CTE, linear	6.10 µm/m-°C @Temperature -30.0 - 70.0 °C
	7.40 µm/m-°C @Temperature 100 - 300 °C
Thermal Conductivity	0.894 W/m-K @Temperature 35.0 °C
Transformation Temperature, Tg	643 °C	per thermal expansion curve
Softening Point	698 °C	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	617 °C	10¹³ poise; ASTM-C336
Strain Point	590 °C	10^14.5 poise; JIS-R3103 and ASTM-C336

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