Ohara L-TIM28 Low Tg Optical Glass

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Ohara L-TIM28 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	2.88 g/cc	2.88 g/cc

Chemical Properties	Metric	English	Comments
Acid Class, SR	1.0	1.0

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	530 @Load 0.0999 kg	530 @Load 0.220 lb
Modulus of Elasticity	84.5 GPa	12300 ksi
Modulus of Rigidity	33.7 GPa	4890 ksi
Poissons Ratio	0.254	0.254
Abrasion	197	197	Aa

Thermal Properties	Metric	English	Comments
CTE, linear	10.1 µm/m-°C @Temperature -30.0 - 70.0 °C	5.61 µin/in-°F @Temperature -22.0 - 158 °F
	13.0 µm/m-°C @Temperature 100 - 300 °C	7.22 µin/in-°F @Temperature 212 - 572 °F
Thermal Conductivity	1.02 W/m-K @Temperature 35.0 °C	7.08 BTU-in/hr-ft²-°F @Temperature 95.0 °F
Transformation Temperature, Tg	504 °C	939 °F	per thermal expansion curve
Softening Point	582 °C	1080 °F	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	484 °C	903 °F	10¹³ poise; ASTM-C336
Strain Point	453 °C	847 °F	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Metric	English	Comments
Refractive Index	1.64569 @Wavelength 2325.42 nm	1.64569 @Wavelength 2325.42 nm
	1.65134 @Wavelength 1970.09 nm	1.65134 @Wavelength 1970.09 nm
	1.65780 @Wavelength 1529.58 nm	1.65780 @Wavelength 1529.58 nm
	1.66448 @Wavelength 1128.64 nm	1.66448 @Wavelength 1128.64 nm
	1.66704 @Wavelength 1013.98 nm	1.66704 @Wavelength 1013.98 nm	nt (Hg t line)
	1.67193 @Wavelength 852.11 nm	1.67193 @Wavelength 852.11 nm	ns (Cs s line)
	1.67552 @Wavelength 768.19 nm	1.67552 @Wavelength 768.19 nm	nA' (K A' line)
	1.67896 @Wavelength 706.52 nm	1.67896 @Wavelength 706.52 nm	nr (He r line)
	1.68249 @Wavelength 656.27 nm	1.68249 @Wavelength 656.27 nm	nC (H C line)
	1.68350 @Wavelength 643.85 nm	1.68350 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.68444 @Wavelength 632.8 nm	1.68444 @Wavelength 632.8 nm	nHe-Ne
	1.68874 @Wavelength 589.29 nm	1.68874 @Wavelength 589.29 nm	nD (Na D line)
	1.68893 @Wavelength 587.56 nm	1.68893 @Wavelength 587.56 nm	nd (He D line)
	1.69417 @Wavelength 546.07 nm	1.69417 @Wavelength 546.07 nm	ne (Hg e line)
	1.70466 @Wavelength 486.13 nm	1.70466 @Wavelength 486.13 nm	nf (H F line)
	1.70601 @Wavelength 479.99 nm	1.70601 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.71611 @Wavelength 441.57 nm	1.71611 @Wavelength 441.57 nm	nHe-Cd
	1.71793 @Wavelength 435.835 nm	1.71793 @Wavelength 435.835 nm	ng (Hg g line)
	1.72970 @Wavelength 404.656 nm	1.72970 @Wavelength 404.656 nm	nh (Hg h line)
	1.75177 @Wavelength 365.015 nm	1.75177 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	30.84	30.84	ν e
	31.08	31.08	ν d
Optical Dispersion	0.006454	0.006454	nd-nC; Partial Dispersion
	0.006973	0.006973	nC-nA'; Partial Dispersion
	0.010697	0.010697	ne-nC'; Partial Dispersion
	0.011705	0.011705	ne-nC; Partial Dispersion
	0.011789	0.011789	nh-ng; Partial Dispersion
	0.011872	0.011872	nF'-ne; Partial Dispersion
	0.013305	0.013305	ng-nF; Partial Dispersion
	0.015462	0.015462	nC-nt; Partial Dispersion
	0.01647	0.01647	nC'-nt; Partial Dispersion
	0.022168	0.022168	nF-nC
	0.022511	0.022511	nF'-nC'
	0.029076	0.029076	ng-nd; Partial Dispersion
Transmission, Visible	82 % @Wavelength 380 nm	82 % @Wavelength 380 nm
	90.3 % @Wavelength 390 nm	90.3 % @Wavelength 390 nm
	94 % @Wavelength 400 nm	94 % @Wavelength 400 nm
	96.9 % @Wavelength 420 nm	96.9 % @Wavelength 420 nm
	97.9 % @Wavelength 440 nm	97.9 % @Wavelength 440 nm
	98.4 % @Wavelength 460 nm	98.4 % @Wavelength 460 nm
	98.8 % @Wavelength 480 nm	98.8 % @Wavelength 480 nm
	99.1 % @Wavelength 500 nm	99.1 % @Wavelength 500 nm
	99.5 % @Wavelength 650 nm	99.5 % @Wavelength 650 nm
	99.6 % @Wavelength 600 nm	99.6 % @Wavelength 600 nm
	99.7 % @Wavelength 550 nm	99.7 % @Wavelength 550 nm
	99.7 % @Wavelength 700 nm	99.7 % @Wavelength 700 nm
IR Transmittance	89 % @Wavelength 2400 nm	89 % @Wavelength 2400 nm
	92.7 % @Wavelength 2200 nm	92.7 % @Wavelength 2200 nm
	98 % @Wavelength 1800 nm	98 % @Wavelength 1800 nm
	99.5 % @Wavelength 1600 nm	99.5 % @Wavelength 1600 nm
	99.8 % @Wavelength 1400 nm	99.8 % @Wavelength 1400 nm
	99.9 % @Wavelength 800 nm	99.9 % @Wavelength 800 nm
	99.9 % @Wavelength 900 nm	99.9 % @Wavelength 900 nm
	99.9 % @Wavelength 1000 nm	99.9 % @Wavelength 1000 nm
	99.9 % @Wavelength 1200 nm	99.9 % @Wavelength 1200 nm
UV Transmittance	1.0 % @Wavelength 350 nm	1.0 % @Wavelength 350 nm
	21 % @Wavelength 360 nm	21 % @Wavelength 360 nm
	60 % @Wavelength 370 nm	60 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	1
Bubble Group	B
CCI	0.00 B
	1.29 G
	1.29 R
coloring, λ 5	355
coloring, λ 80	400
Coloring, Internal Transmission λ 0.05	352
Coloring, Internal Transmission λ 0.80	379
Knoop Hardness Class	5
Melt Frequency	4
Ohara Code d	689311
Ohara Code e	694308
Ohara Status	Standard
Phosphate Resistance, PR	1
Photoelastic Constant (ß)	2.62
Relative Price	13.5		S-BSL7 = 1
Water Resistance, RW(P)	2
Weathering Resistance (Surface Method) W(S)max	1
Weathering Resistance (Surface Method) W(S)min	2
Yield Point, At (°C)	539		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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