Ohara S-LAH51 Optical Glass

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Ohara S-LAH51 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	4.40 g/cc	4.40 g/cc

Chemical Properties	Metric	English	Comments
Acid Class, SR	4.0	4.0

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	660 @Load 0.0999 kg	660 @Load 0.220 lb
Modulus of Elasticity	112.9 GPa	16380 ksi
Modulus of Rigidity	43.5 GPa	6310 ksi
Poissons Ratio	0.297	0.297
Abrasion	79	79	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
	7.20 µm/m-°C @Temperature 100 - 300 °C	4.00 µin/in-°F @Temperature 212 - 572 °F
Thermal Conductivity	0.826 W/m-K @Temperature 35.0 °C	5.73 BTU-in/hr-ft²-°F @Temperature 95.0 °F
Transformation Temperature, Tg	617 °C	1140 °F	per thermal expansion curve
Softening Point	677 °C	1250 °F	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	598 °C	1110 °F	10¹³ poise; ASTM-C336
Strain Point	568 °C	1050 °F	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Metric	English	Comments
Refractive Index	1.74265 @Wavelength 2325.42 nm	1.74265 @Wavelength 2325.42 nm
	1.74972 @Wavelength 1970.09 nm	1.74972 @Wavelength 1970.09 nm
	1.75740 @Wavelength 1529.58 nm	1.75740 @Wavelength 1529.58 nm
	1.76452 @Wavelength 1128.64 nm	1.76452 @Wavelength 1128.64 nm
	1.76700 @Wavelength 1013.98 nm	1.76700 @Wavelength 1013.98 nm	nt (Hg t line)
	1.77150 @Wavelength 852.11 nm	1.77150 @Wavelength 852.11 nm	ns (Cs s line)
	1.77466 @Wavelength 768.19 nm	1.77466 @Wavelength 768.19 nm	nA' (K A' line)
	1.77761 @Wavelength 706.52 nm	1.77761 @Wavelength 706.52 nm	nr (He r line)
	1.78058 @Wavelength 656.27 nm	1.78058 @Wavelength 656.27 nm	nC (H C line)
	1.78142 @Wavelength 643.85 nm	1.78142 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.78221 @Wavelength 632.8 nm	1.78221 @Wavelength 632.8 nm	nHe-Ne
	1.78574 @Wavelength 589.29 nm	1.78574 @Wavelength 589.29 nm	nD (Na D line)
	1.78590 @Wavelength 587.56 nm	1.78590 @Wavelength 587.56 nm	nd (He D line)
	1.79012 @Wavelength 546.07 nm	1.79012 @Wavelength 546.07 nm	ne (Hg e line)
	1.79836 @Wavelength 486.13 nm	1.79836 @Wavelength 486.13 nm	nf (H F line)
	1.79940 @Wavelength 479.99 nm	1.79940 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.80704 @Wavelength 441.57 nm	1.80704 @Wavelength 441.57 nm	nHe-Cd
	1.80838 @Wavelength 435.835 nm	1.80838 @Wavelength 435.835 nm	ng (Hg g line)
	1.81687 @Wavelength 404.656 nm	1.81687 @Wavelength 404.656 nm	nh (Hg h line)
	1.83175 @Wavelength 365.015 nm	1.83175 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	43.95	43.95	ν e
	44.2	44.2	ν d
Optical Dispersion	0.005312	0.005312	nd-nC; Partial Dispersion
	0.005923	0.005923	nC-nA'; Partial Dispersion
	0.008492	0.008492	nh-ng; Partial Dispersion
	0.0087	0.0087	ne-nC'; Partial Dispersion
	0.009279	0.009279	nF'-ne; Partial Dispersion
	0.009539	0.009539	ne-nC; Partial Dispersion
	0.010012	0.010012	ng-nF; Partial Dispersion
	0.01358	0.01358	nC-nt; Partial Dispersion
	0.014419	0.014419	nC'-nt; Partial Dispersion
	0.01778	0.01778	nF-nC
	0.017979	0.017979	nF'-nC'
	0.02248	0.02248	ng-nd; Partial Dispersion
	0.023375	0.023375	ni-ng; Partial Dispersion
	0.032349	0.032349	ni-nF'; Partial Dispersion
Transmission, Visible	91 % @Wavelength 380 nm	91 % @Wavelength 380 nm
	94.2 % @Wavelength 390 nm	94.2 % @Wavelength 390 nm
	96.1 % @Wavelength 400 nm	96.1 % @Wavelength 400 nm
	97.7 % @Wavelength 420 nm	97.7 % @Wavelength 420 nm
	98.4 % @Wavelength 440 nm	98.4 % @Wavelength 440 nm
	98.9 % @Wavelength 460 nm	98.9 % @Wavelength 460 nm
	99.3 % @Wavelength 480 nm	99.3 % @Wavelength 480 nm
	99.5 % @Wavelength 500 nm	99.5 % @Wavelength 500 nm
	99.7 % @Wavelength 600 nm	99.7 % @Wavelength 600 nm
	99.7 % @Wavelength 650 nm	99.7 % @Wavelength 650 nm
	99.8 % @Wavelength 550 nm	99.8 % @Wavelength 550 nm
	99.8 % @Wavelength 700 nm	99.8 % @Wavelength 700 nm
IR Transmittance	68 % @Wavelength 2400 nm	68 % @Wavelength 2400 nm
	89 % @Wavelength 2200 nm	89 % @Wavelength 2200 nm
	98.1 % @Wavelength 1800 nm	98.1 % @Wavelength 1800 nm
	98.9 % @Wavelength 1600 nm	98.9 % @Wavelength 1600 nm
	99.1 % @Wavelength 1400 nm	99.1 % @Wavelength 1400 nm
	99.6 % @Wavelength 1000 nm	99.6 % @Wavelength 1000 nm
	99.6 % @Wavelength 1200 nm	99.6 % @Wavelength 1200 nm
	99.7 % @Wavelength 900 nm	99.7 % @Wavelength 900 nm
	99.8 % @Wavelength 800 nm	99.8 % @Wavelength 800 nm
UV Transmittance	1.0 % @Wavelength 330 nm	1.0 % @Wavelength 330 nm
	17 % @Wavelength 340 nm	17 % @Wavelength 340 nm
	51 % @Wavelength 350 nm	51 % @Wavelength 350 nm
	73 % @Wavelength 360 nm	73 % @Wavelength 360 nm
	84 % @Wavelength 370 nm	84 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	4
CCI	0.00 B
	0.83 G
	0.83 R
coloring, λ 5	335
coloring, λ 80	390
Coloring, Internal Transmission λ 0.05	333
Coloring, Internal Transmission λ 0.80	366
Knoop Hardness Class	7
Melt Frequency	2
Ohara Code d	786442
Ohara Code e	790439
Ohara Status	Preferred
Phosphate Resistance, PR	2
Photoelastic Constant (ß)	1.88
Relative Price	6.5		S-BSL7 = 1
Water Resistance, RW(P)	1
Weathering Resistance (Surface Method) W(S)max	1
Weathering Resistance (Surface Method) W(S)min	2
Yield Point, At (°C)	641		per thermal expansion curve

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