Ohara L-BBH1 Low Tg Optical Glass

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Ohara L-BBH1 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	6.57 g/cc	6.57 g/cc

Chemical Properties	Metric	English	Comments
Acid Class, SR	53.2	53.2

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	330 @Load 0.0999 kg	330 @Load 0.220 lb
Modulus of Elasticity	68.8 GPa	9980 ksi
Modulus of Rigidity	27.2 GPa	3950 ksi
Poissons Ratio	0.268	0.268
Abrasion	384	384	Aa

Thermal Properties	Metric	English	Comments
CTE, linear	10.7 µm/m-°C @Temperature -30.0 - 70.0 °C	5.94 µin/in-°F @Temperature -22.0 - 158 °F
	12.6 µm/m-°C @Temperature 100 - 300 °C	7.00 µin/in-°F @Temperature 212 - 572 °F
Thermal Conductivity	0.653 W/m-K @Temperature 35.0 °C	4.53 BTU-in/hr-ft²-°F @Temperature 95.0 °F
Transformation Temperature, Tg	350 °C	662 °F	per thermal expansion curve

Optical Properties	Metric	English	Comments
Refractive Index	2.01117 @Wavelength 2325.42 nm	2.01117 @Wavelength 2325.42 nm
	2.01775 @Wavelength 1970.09 nm	2.01775 @Wavelength 1970.09 nm
	2.02665 @Wavelength 1529.58 nm	2.02665 @Wavelength 1529.58 nm
	2.03884 @Wavelength 1128.64 nm	2.03884 @Wavelength 1128.64 nm
	2.04441 @Wavelength 1013.98 nm	2.04441 @Wavelength 1013.98 nm	nt (Hg t line)
	2.05606 @Wavelength 852.11 nm	2.05606 @Wavelength 852.11 nm	ns (Cs s line)
	2.06522 @Wavelength 768.19 nm	2.06522 @Wavelength 768.19 nm	nA' (K A' line)
	2.07429 @Wavelength 706.52 nm	2.07429 @Wavelength 706.52 nm	nr (He r line)
	2.08390 @Wavelength 656.27 nm	2.08390 @Wavelength 656.27 nm	nC (H C line)
	2.08668 @Wavelength 643.85 nm	2.08668 @Wavelength 643.85 nm	nC' (Cd C' line)
	2.08932 @Wavelength 632.8 nm	2.08932 @Wavelength 632.8 nm	nHe-Ne
	2.10150 @Wavelength 589.29 nm	2.10150 @Wavelength 589.29 nm	nD (Na D line)
	2.10205 @Wavelength 587.56 nm	2.10205 @Wavelength 587.56 nm	nd (He D line)
	2.11737 @Wavelength 546.07 nm	2.11737 @Wavelength 546.07 nm	ne (Hg e line)
	2.14961 @Wavelength 486.13 nm	2.14961 @Wavelength 486.13 nm	nf (H F line)
	2.15391 @Wavelength 479.99 nm	2.15391 @Wavelength 479.99 nm	nF' (Cd F' line)
	2.18749 @Wavelength 441.57 nm	2.18749 @Wavelength 441.57 nm	nHe-Cd
	2.19378 @Wavelength 435.835 nm	2.19378 @Wavelength 435.835 nm	ng (Hg g line)
Abbe Number	16.62	16.62	ν e
	16.77	16.77	ν d
Optical Dispersion	0.065712	0.065712	nF-nC
	0.067232	0.067232	nF'-nC'
Transmission, Visible	1.0 % @Wavelength 420 nm	1.0 % @Wavelength 420 nm
	51 % @Wavelength 440 nm	51 % @Wavelength 440 nm
	86 % @Wavelength 460 nm	86 % @Wavelength 460 nm
	94.8 % @Wavelength 480 nm	94.8 % @Wavelength 480 nm
	97.1 % @Wavelength 500 nm	97.1 % @Wavelength 500 nm
	97.7 % @Wavelength 650 nm	97.7 % @Wavelength 650 nm
	97.8 % @Wavelength 700 nm	97.8 % @Wavelength 700 nm
	98 % @Wavelength 600 nm	98 % @Wavelength 600 nm
	98.4 % @Wavelength 550 nm	98.4 % @Wavelength 550 nm
IR Transmittance	87 % @Wavelength 2400 nm	87 % @Wavelength 2400 nm
	94.5 % @Wavelength 2200 nm	94.5 % @Wavelength 2200 nm
	98.3 % @Wavelength 800 nm	98.3 % @Wavelength 800 nm
	98.7 % @Wavelength 1800 nm	98.7 % @Wavelength 1800 nm
	98.8 % @Wavelength 900 nm	98.8 % @Wavelength 900 nm
	99.1 % @Wavelength 1000 nm	99.1 % @Wavelength 1000 nm
	99.3 % @Wavelength 1600 nm	99.3 % @Wavelength 1600 nm
	99.5 % @Wavelength 1200 nm	99.5 % @Wavelength 1200 nm
	99.5 % @Wavelength 1400 nm	99.5 % @Wavelength 1400 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	2
coloring, λ 5	430
coloring, λ 70	470
Knoop Hardness Class	3
Melt Frequency	5
Ohara Code d	102168
Ohara Code e	102166
Ohara Status	Standard
Phosphate Resistance, PR	2.2
Photoelastic Constant (ß)	0.75
Relative Price	29		S-BSL7 = 1
Water Resistance, RW(P)	1
Weathering Resistance (Surface Method) W(S)max	3
Yield Point, At (°C)	378		per thermal expansion curve

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