Ohara L-LAM72 Low Tg Optical Glass

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Ohara L-LAM72 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	3.89 g/cc	3.89 g/cc

Chemical Properties	Metric	English	Comments
Acid Class, SR	51.2	51.2

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	680 @Load 0.0999 kg	680 @Load 0.220 lb
Modulus of Elasticity	118.2 GPa	17140 ksi
Modulus of Rigidity	46.0 GPa	6670 ksi
Poissons Ratio	0.283	0.283
Abrasion	82	82	Aa

Thermal Properties	Metric	English	Comments
CTE, linear	6.60 µm/m-°C @Temperature -30.0 - 70.0 °C	3.67 µin/in-°F @Temperature -22.0 - 158 °F
	8.00 µm/m-°C @Temperature 100 - 300 °C	4.44 µin/in-°F @Temperature 212 - 572 °F
Transformation Temperature, Tg	565 °C	1050 °F	per thermal expansion curve
Softening Point	641 °C	1190 °F	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	552 °C	1030 °F	10¹³ poise; ASTM-C336
Strain Point	533 °C	991 °F	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Metric	English	Comments
Refractive Index	1.69303 @Wavelength 2325.42 nm	1.69303 @Wavelength 2325.42 nm
	1.70012 @Wavelength 1970.09 nm	1.70012 @Wavelength 1970.09 nm
	1.70769 @Wavelength 1529.58 nm	1.70769 @Wavelength 1529.58 nm
	1.71444 @Wavelength 1128.64 nm	1.71444 @Wavelength 1128.64 nm
	1.71671 @Wavelength 1013.98 nm	1.71671 @Wavelength 1013.98 nm	nt (Hg t line)
	1.72071 @Wavelength 852.11 nm	1.72071 @Wavelength 852.11 nm	ns (Cs s line)
	1.72348 @Wavelength 768.19 nm	1.72348 @Wavelength 768.19 nm	nA' (K A' line)
	1.72603 @Wavelength 706.52 nm	1.72603 @Wavelength 706.52 nm	nr (He r line)
	1.72858 @Wavelength 656.27 nm	1.72858 @Wavelength 656.27 nm	nC (H C line)
	1.72930 @Wavelength 643.85 nm	1.72930 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.72997 @Wavelength 632.8 nm	1.72997 @Wavelength 632.8 nm	nHe-Ne
	1.73297 @Wavelength 589.29 nm	1.73297 @Wavelength 589.29 nm	nD (Na D line)
	1.73310 @Wavelength 587.56 nm	1.73310 @Wavelength 587.56 nm	nd (He D line)
	1.73667 @Wavelength 546.07 nm	1.73667 @Wavelength 546.07 nm	ne (Hg e line)
	1.74357 @Wavelength 486.13 nm	1.74357 @Wavelength 486.13 nm	nf (H F line)
	1.74444 @Wavelength 479.99 nm	1.74444 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.75076 @Wavelength 441.57 nm	1.75076 @Wavelength 441.57 nm	nHe-Cd
	1.75187 @Wavelength 435.835 nm	1.75187 @Wavelength 435.835 nm	ng (Hg g line)
	1.75882 @Wavelength 404.656 nm	1.75882 @Wavelength 404.656 nm	nh (Hg h line)
	1.77083 @Wavelength 365.015 nm	1.77083 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	48.65	48.65	ν e
	48.89	48.89	ν d
Optical Dispersion	0.014994	0.014994	nF-nC
	0.015141	0.015141	nF'-nC'
Transmission, Visible	95.1 % @Wavelength 380 nm	95.1 % @Wavelength 380 nm
	96.6 % @Wavelength 390 nm	96.6 % @Wavelength 390 nm
	97.4 % @Wavelength 400 nm	97.4 % @Wavelength 400 nm
	98.1 % @Wavelength 420 nm	98.1 % @Wavelength 420 nm
	98.5 % @Wavelength 440 nm	98.5 % @Wavelength 440 nm
	98.9 % @Wavelength 460 nm	98.9 % @Wavelength 460 nm
	99.2 % @Wavelength 480 nm	99.2 % @Wavelength 480 nm
	99.5 % @Wavelength 500 nm	99.5 % @Wavelength 500 nm
	99.6 % @Wavelength 600 nm	99.6 % @Wavelength 600 nm
	99.6 % @Wavelength 650 nm	99.6 % @Wavelength 650 nm
	99.7 % @Wavelength 550 nm	99.7 % @Wavelength 550 nm
	99.7 % @Wavelength 700 nm	99.7 % @Wavelength 700 nm
IR Transmittance	74 % @Wavelength 2400 nm	74 % @Wavelength 2400 nm
	93.2 % @Wavelength 2200 nm	93.2 % @Wavelength 2200 nm
	99.1 % @Wavelength 1800 nm	99.1 % @Wavelength 1800 nm
	99.6 % @Wavelength 1600 nm	99.6 % @Wavelength 1600 nm
	99.7 % @Wavelength 1400 nm	99.7 % @Wavelength 1400 nm
	99.8 % @Wavelength 800 nm	99.8 % @Wavelength 800 nm
	99.8 % @Wavelength 900 nm	99.8 % @Wavelength 900 nm
	99.8 % @Wavelength 1000 nm	99.8 % @Wavelength 1000 nm
	99.8 % @Wavelength 1200 nm	99.8 % @Wavelength 1200 nm
UV Transmittance	1.0 % @Wavelength 290 nm	1.0 % @Wavelength 290 nm
	8.0 % @Wavelength 300 nm	8.0 % @Wavelength 300 nm
	22 % @Wavelength 310 nm	22 % @Wavelength 310 nm
	39 % @Wavelength 320 nm	39 % @Wavelength 320 nm
	56 % @Wavelength 330 nm	56 % @Wavelength 330 nm
	70 % @Wavelength 340 nm	70 % @Wavelength 340 nm
	81 % @Wavelength 350 nm	81 % @Wavelength 350 nm
	88 % @Wavelength 360 nm	88 % @Wavelength 360 nm
	92.6 % @Wavelength 370 nm	92.6 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	4
coloring, λ 5	300
coloring, λ 80	370
Knoop Hardness Class	7
Melt Frequency	4
Ohara Code d	733489
Ohara Code e	737487
Ohara Status	Standard
Phosphate Resistance, PR	1.2
Relative Price	15.5		S-BSL7 = 1
Water Resistance, RW(P)	1
Yield Point, At (°C)	608		per thermal expansion curve

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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