Ohara L-LAH90 Low Tg Optical Glass

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Ohara L-LAH90 Low Tg Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Information provided by Ohara Corporation.
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Physical Properties	Metric	English	Comments

Specific Gravity	4.65 g/cc	4.65 g/cc

Chemical Properties	Metric	English	Comments
Acid Class, SR	5.2	5.2

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	640 @Load 0.0999 kg	640 @Load 0.220 lb
Modulus of Elasticity	114.8 GPa	16650 ksi
Modulus of Rigidity	44.0 GPa	6380 ksi
Poissons Ratio	0.304	0.304
Abrasion	73	73	Aa

Thermal Properties	Metric	English	Comments
CTE, linear	6.30 µm/m-°C @Temperature -30.0 - 70.0 °C	3.50 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	0.839 W/m-K @Temperature 35.0 °C	5.82 BTU-in/hr-ft²-°F @Temperature 95.0 °F
Transformation Temperature, Tg	607 °C	1120 °F	per thermal expansion curve
Softening Point	677 °C	1250 °F	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	597 °C	1110 °F	10¹³ poise; ASTM-C336
Strain Point	578 °C	1070 °F	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Metric	English	Comments
Refractive Index	1.78602 @Wavelength 2325.42 nm	1.78602 @Wavelength 2325.42 nm
	1.79293 @Wavelength 1970.09 nm	1.79293 @Wavelength 1970.09 nm
	1.80058 @Wavelength 1529.58 nm	1.80058 @Wavelength 1529.58 nm
	1.80800 @Wavelength 1128.64 nm	1.80800 @Wavelength 1128.64 nm
	1.81069 @Wavelength 1013.98 nm	1.81069 @Wavelength 1013.98 nm	nt (Hg t line)
	1.81568 @Wavelength 852.11 nm	1.81568 @Wavelength 852.11 nm	ns (Cs s line)
	1.81926 @Wavelength 768.19 nm	1.81926 @Wavelength 768.19 nm	nA' (K A' line)
	1.82262 @Wavelength 706.52 nm	1.82262 @Wavelength 706.52 nm	nr (He r line)
	1.82605 @Wavelength 656.27 nm	1.82605 @Wavelength 656.27 nm	nC (H C line)
	1.82701 @Wavelength 643.85 nm	1.82701 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.82792 @Wavelength 632.8 nm	1.82792 @Wavelength 632.8 nm	nHe-Ne
	1.83202 @Wavelength 589.29 nm	1.83202 @Wavelength 589.29 nm	nD (Na D line)
	1.83220 @Wavelength 587.56 nm	1.83220 @Wavelength 587.56 nm	nd (He D line)
	1.83713 @Wavelength 546.07 nm	1.83713 @Wavelength 546.07 nm	ne (Hg e line)
	1.84680 @Wavelength 486.13 nm	1.84680 @Wavelength 486.13 nm	nf (H F line)
	1.84803 @Wavelength 479.99 nm	1.84803 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.85707 @Wavelength 441.57 nm	1.85707 @Wavelength 441.57 nm	nHe-Cd
	1.85866 @Wavelength 435.835 nm	1.85866 @Wavelength 435.835 nm	ng (Hg g line)
	1.86881 @Wavelength 404.656 nm	1.86881 @Wavelength 404.656 nm	nh (Hg h line)
	1.88683 @Wavelength 365.015 nm	1.88683 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	39.84	39.84	ν e
	40.1	40.1	ν d
Optical Dispersion	0.006153	0.006153	nd-nC; Partial Dispersion
	0.006789	0.006789	nC-nA'; Partial Dispersion
	0.010113	0.010113	ne-nC'; Partial Dispersion
	0.010152	0.010152	nh-ng; Partial Dispersion
	0.010898	0.010898	nF'-ne; Partial Dispersion
	0.011081	0.011081	ne-nC; Partial Dispersion
	0.01186	0.01186	ng-nF; Partial Dispersion
	0.015354	0.015354	nC-nt; Partial Dispersion
	0.016322	0.016322	nC'-nt; Partial Dispersion
	0.020755	0.020755	nF-nC
	0.021011	0.021011	nF'-nC'
	0.026462	0.026462	ng-nd; Partial Dispersion
	0.028165	0.028165	ni-ng; Partial Dispersion
	0.038801	0.038801	ni-nF'; Partial Dispersion
Transmission, Visible	84 % @Wavelength 380 nm	84 % @Wavelength 380 nm
	90.3 % @Wavelength 390 nm	90.3 % @Wavelength 390 nm
	93.6 % @Wavelength 400 nm	93.6 % @Wavelength 400 nm
	96.6 % @Wavelength 420 nm	96.6 % @Wavelength 420 nm
	97.8 % @Wavelength 440 nm	97.8 % @Wavelength 440 nm
	98.5 % @Wavelength 460 nm	98.5 % @Wavelength 460 nm
	99 % @Wavelength 480 nm	99 % @Wavelength 480 nm
	99.4 % @Wavelength 500 nm	99.4 % @Wavelength 500 nm
	99.8 % @Wavelength 550 nm	99.8 % @Wavelength 550 nm
	99.8 % @Wavelength 600 nm	99.8 % @Wavelength 600 nm
	99.8 % @Wavelength 650 nm	99.8 % @Wavelength 650 nm
	99.9 % @Wavelength 700 nm	99.9 % @Wavelength 700 nm
IR Transmittance	75 % @Wavelength 2400 nm	75 % @Wavelength 2400 nm
	92.5 % @Wavelength 2200 nm	92.5 % @Wavelength 2200 nm
	98.8 % @Wavelength 1800 nm	98.8 % @Wavelength 1800 nm
	99.4 % @Wavelength 1600 nm	99.4 % @Wavelength 1600 nm
	99.6 % @Wavelength 1400 nm	99.6 % @Wavelength 1400 nm
	99.7 % @Wavelength 1000 nm	99.7 % @Wavelength 1000 nm
	99.7 % @Wavelength 1200 nm	99.7 % @Wavelength 1200 nm
	99.8 % @Wavelength 900 nm	99.8 % @Wavelength 900 nm
	99.9 % @Wavelength 800 nm	99.9 % @Wavelength 800 nm
UV Transmittance	5.0 % @Wavelength 340 nm	5.0 % @Wavelength 340 nm
	26 % @Wavelength 350 nm	26 % @Wavelength 350 nm
	55 % @Wavelength 360 nm	55 % @Wavelength 360 nm
	73 % @Wavelength 370 nm	73 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	4
CCI	0.00 B
	1.32 G
	1.32 R
coloring, λ 5	340
coloring, λ 80	415
Coloring, Internal Transmission λ 0.05	340
Coloring, Internal Transmission λ 0.80	376
Knoop Hardness Class	6
Melt Frequency	1
Ohara Code d	832401
Ohara Code e	837398
Ohara Status	Preferred
Phosphate Resistance, PR	1.2
Photoelastic Constant (ß)	1.93
Relative Price	9.0		S-BSL7 = 1
Water Resistance, RW(P)	1
Weathering Resistance (Surface Method) W(S)max	2
Yield Point, At (°C)	644		per thermal expansion curve

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CZOHARA818 / 192093

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