Ohara L-LAH53 Low Tg Optical Glass

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Ohara L-LAH53 Low Tg Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Information provided by Ohara Corporation.
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Physical Properties	Original Value	Comments

Specific Gravity	4.49 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	51.2

Mechanical Properties	Original Value	Comments
Hardness, Knoop	660 @Load 0.0999 kg
Modulus of Elasticity	115.1 GPa
Modulus of Rigidity	44.3 GPa
Poissons Ratio	0.298
Abrasion	76	Aa

Thermal Properties	Original Value	Comments
CTE, linear	5.90 µm/m-°C @Temperature -30.0 - 70.0 °C
	7.20 µm/m-°C @Temperature 100 - 300 °C
Thermal Conductivity	0.862 W/m-K @Temperature 35.0 °C
Transformation Temperature, Tg	574 °C	per thermal expansion curve
Softening Point	646 °C	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	558 °C	10¹³ poise; ASTM-C336
Strain Point	534 °C	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Original Value	Comments
Refractive Index	1.76076 @Wavelength 2325.42 nm
	1.76780 @Wavelength 1970.09 nm
	1.77552 @Wavelength 1529.58 nm
	1.78286 @Wavelength 1128.64 nm
	1.78549 @Wavelength 1013.98 nm	nt (Hg t line)
	1.79031 @Wavelength 852.11 nm	ns (Cs s line)
	1.79375 @Wavelength 768.19 nm	nA' (K A' line)
	1.79697 @Wavelength 706.52 nm	nr (He r line)
	1.80024 @Wavelength 656.27 nm	nC (H C line)
	1.80116 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.80203 @Wavelength 632.8 nm	nHe-Ne
	1.80592 @Wavelength 589.29 nm	nD (Na D line)
	1.80610 @Wavelength 587.56 nm	nd (He D line)
	1.81078 @Wavelength 546.07 nm	ne (Hg e line)
	1.81996 @Wavelength 486.13 nm	nf (H F line)
	1.82112 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.82967 @Wavelength 441.57 nm	nHe-Cd
	1.83117 @Wavelength 435.835 nm	ng (Hg g line)
	1.84075 @Wavelength 404.656 nm	nh (Hg h line)
	1.85768 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	40.63	ν e
	40.88	ν d
Optical Dispersion	0.005856	nd-nC; Partial Dispersion
	0.006484	nC-nA'; Partial Dispersion
	0.009578	nh-ng; Partial Dispersion
	0.009615	ne-nC'; Partial Dispersion
	0.010331	nF'-ne; Partial Dispersion
	0.010537	ne-nC; Partial Dispersion
	0.011217	ng-nF; Partial Dispersion
	0.014736	nC-nt; Partial Dispersion
	0.015658	nC'-nt; Partial Dispersion
	0.019718	nF-nC
	0.019954	nF'-nC'
	0.02507	ng-nd; Partial Dispersion
	0.026514	ni-ng; Partial Dispersion
	0.036572	ni-nF'; Partial Dispersion
Transmission, Visible	90.8 % @Wavelength 380 nm
	94 % @Wavelength 390 nm
	95.9 % @Wavelength 400 nm
	97.6 % @Wavelength 420 nm
	98.3 % @Wavelength 440 nm
	98.8 % @Wavelength 460 nm
	99.1 % @Wavelength 480 nm
	99.5 % @Wavelength 500 nm
	99.8 % @Wavelength 550 nm
	99.8 % @Wavelength 600 nm
	99.9 % @Wavelength 650 nm
	99.9 % @Wavelength 700 nm
UV Transmittance	13 % @Wavelength 340 nm
	48 % @Wavelength 350 nm
	70 % @Wavelength 360 nm
	84 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	4
CCI	0.00 B
	0.88 G
	0.88 R
coloring, λ 5	335
coloring, λ 80	400
Coloring, Internal Transmission λ 0.05	338
Coloring, Internal Transmission λ 0.80	367
Knoop Hardness Class	7
Melt Frequency	2
Ohara Code d	806409
Ohara Code e	811406
Ohara Status	Preferred
Phosphate Resistance, PR	2
Relative Price	17.5	S-BSL7 = 1
Water Resistance, RW(P)	1
Weathering Resistance (Surface Method) W(S)max	1
Yield Point, At (°C)	607	per thermal expansion curve

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