Ohara S-BSM71 Optical Glass

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Ohara S-BSM71 Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Boron and Silicon are important constituents. ECO optical glass that does not contain any lead or arsenic. Information provided by Ohara Corporation.
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Physical Properties	Metric	English	Comments

Specific Gravity	3.74 g/cc	3.74 g/cc

Chemical Properties	Metric	English	Comments
Acid Class, SR	53.2	53.2

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	560 @Load 0.0999 kg	560 @Load 0.220 lb
Modulus of Elasticity	86.2 GPa	12500 ksi
Modulus of Rigidity	33.9 GPa	4920 ksi
Poissons Ratio	0.273	0.273
Abrasion	173	173	Aa

Thermal Properties	Metric	English	Comments
CTE, linear	7.10 µm/m-°C @Temperature -30.0 - 70.0 °C	3.94 µin/in-°F @Temperature -22.0 - 158 °F
	8.30 µm/m-°C @Temperature 100 - 300 °C	4.61 µin/in-°F @Temperature 212 - 572 °F
Thermal Conductivity	0.773 W/m-K @Temperature 35.0 °C	5.36 BTU-in/hr-ft²-°F @Temperature 95.0 °F
Transformation Temperature, Tg	651 °C	1200 °F	per thermal expansion curve
Softening Point	737 °C	1360 °F	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	635 °C	1180 °F	10¹³ poise; ASTM-C336
Strain Point	607 °C	1120 °F	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Metric	English	Comments
Refractive Index	1.61657 @Wavelength 2325.42 nm	1.61657 @Wavelength 2325.42 nm
	1.62205 @Wavelength 1970.09 nm	1.62205 @Wavelength 1970.09 nm
	1.62799 @Wavelength 1529.58 nm	1.62799 @Wavelength 1529.58 nm
	1.63336 @Wavelength 1128.64 nm	1.63336 @Wavelength 1128.64 nm
	1.63518 @Wavelength 1013.98 nm	1.63518 @Wavelength 1013.98 nm	nt (Hg t line)
	1.63842 @Wavelength 852.11 nm	1.63842 @Wavelength 852.11 nm	ns (Cs s line)
	1.64067 @Wavelength 768.19 nm	1.64067 @Wavelength 768.19 nm	nA' (K A' line)
	1.64274 @Wavelength 706.52 nm	1.64274 @Wavelength 706.52 nm	nr (He r line)
	1.64482 @Wavelength 656.27 nm	1.64482 @Wavelength 656.27 nm	nC (H C line)
	1.64540 @Wavelength 643.85 nm	1.64540 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.64595 @Wavelength 632.8 nm	1.64595 @Wavelength 632.8 nm	nHe-Ne
	1.64839 @Wavelength 589.29 nm	1.64839 @Wavelength 589.29 nm	nD (Na D line)
	1.64850 @Wavelength 587.56 nm	1.64850 @Wavelength 587.56 nm	nd (He D line)
	1.65141 @Wavelength 546.07 nm	1.65141 @Wavelength 546.07 nm	ne (Hg e line)
	1.65705 @Wavelength 486.13 nm	1.65705 @Wavelength 486.13 nm	nf (H F line)
	1.65775 @Wavelength 479.99 nm	1.65775 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.66293 @Wavelength 441.57 nm	1.66293 @Wavelength 441.57 nm	nHe-Cd
	1.66383 @Wavelength 435.835 nm	1.66383 @Wavelength 435.835 nm	ng (Hg g line)
	1.66954 @Wavelength 404.656 nm	1.66954 @Wavelength 404.656 nm	nh (Hg h line)
	1.67943 @Wavelength 365.015 nm	1.67943 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	52.73	52.73	ν e
	53.02	53.02	ν d
Optical Dispersion	0.003683	0.003683	nd-nC; Partial Dispersion
	0.00415	0.00415	nC-nA'; Partial Dispersion
	0.005706	0.005706	nh-ng; Partial Dispersion
	0.006011	0.006011	ne-nC'; Partial Dispersion
	0.006342	0.006342	nF'-ne; Partial Dispersion
	0.006595	0.006595	ne-nC; Partial Dispersion
	0.006785	0.006785	ng-nF; Partial Dispersion
	0.009631	0.009631	nC-nt; Partial Dispersion
	0.010215	0.010215	nC'-nt; Partial Dispersion
	0.012231	0.012231	nF-nC
	0.012353	0.012353	nF'-nC'
	0.015333	0.015333	ng-nd; Partial Dispersion
	0.015599	0.015599	ni-ng; Partial Dispersion
	0.021678	0.021678	ni-nF'; Partial Dispersion
Transmission, Visible	92.6 % @Wavelength 380 nm	92.6 % @Wavelength 380 nm
	95.8 % @Wavelength 390 nm	95.8 % @Wavelength 390 nm
	97.3 % @Wavelength 400 nm	97.3 % @Wavelength 400 nm
	98.5 % @Wavelength 420 nm	98.5 % @Wavelength 420 nm
	98.8 % @Wavelength 440 nm	98.8 % @Wavelength 440 nm
	99 % @Wavelength 460 nm	99 % @Wavelength 460 nm
	99.3 % @Wavelength 480 nm	99.3 % @Wavelength 480 nm
	99.5 % @Wavelength 500 nm	99.5 % @Wavelength 500 nm
	99.6 % @Wavelength 650 nm	99.6 % @Wavelength 650 nm
	99.7 % @Wavelength 600 nm	99.7 % @Wavelength 600 nm
	99.7 % @Wavelength 700 nm	99.7 % @Wavelength 700 nm
	99.8 % @Wavelength 550 nm	99.8 % @Wavelength 550 nm
IR Transmittance	82 % @Wavelength 2400 nm	82 % @Wavelength 2400 nm
	92.5 % @Wavelength 2200 nm	92.5 % @Wavelength 2200 nm
	98.5 % @Wavelength 1800 nm	98.5 % @Wavelength 1800 nm
	99.3 % @Wavelength 1400 nm	99.3 % @Wavelength 1400 nm
	99.3 % @Wavelength 1600 nm	99.3 % @Wavelength 1600 nm
	99.7 % @Wavelength 1000 nm	99.7 % @Wavelength 1000 nm
	99.7 % @Wavelength 1200 nm	99.7 % @Wavelength 1200 nm
	99.8 % @Wavelength 800 nm	99.8 % @Wavelength 800 nm
	99.8 % @Wavelength 900 nm	99.8 % @Wavelength 900 nm
UV Transmittance	15 % @Wavelength 340 nm	15 % @Wavelength 340 nm
	47 % @Wavelength 350 nm	47 % @Wavelength 350 nm
	72 % @Wavelength 360 nm	72 % @Wavelength 360 nm
	86 % @Wavelength 370 nm	86 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	5
CCI	0.00 B
	0.59 G
	0.59 R
coloring, λ 5	335
coloring, λ 80	375
Coloring, Internal Transmission λ 0.05	337
Coloring, Internal Transmission λ 0.80	366
Knoop Hardness Class	6
Melt Frequency	4
Ohara Code d	649530
Ohara Code e	651527
Ohara Status	Standard
Phosphate Resistance, PR	4
Photoelastic Constant (ß)	1.81
Relative Price	4		S-BSL7 = 1
Water Resistance, RW(P)	1
Weathering Resistance (Surface Method) W(S)max	2
Weathering Resistance (Surface Method) W(S)min	3
Yield Point, At (°C)	687		per thermal expansion curve

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