Ohara S-BSL 7 Optical Glass

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Ohara S-BSL 7 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	2.52 g/cc	2.52 g/cc

Chemical Properties	Metric	English	Comments
Acid Class, SR	1.0	1.0

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	570 @Load 0.0999 kg	570 @Load 0.220 lb
Modulus of Elasticity	80.0 GPa	11600 ksi
Modulus of Rigidity	33.2 GPa	4820 ksi
Poissons Ratio	0.205	0.205
Abrasion	94	94	Aa

Thermal Properties	Metric	English	Comments
CTE, linear	7.20 µm/m-°C @Temperature -30.0 - 70.0 °C	4.00 µin/in-°F @Temperature -22.0 - 158 °F
	8.60 µm/m-°C @Temperature 100 - 300 °C	4.78 µin/in-°F @Temperature 212 - 572 °F
Thermal Conductivity	1.13 W/m-K @Temperature 35.0 °C	7.84 BTU-in/hr-ft²-°F @Temperature 95.0 °F
Transformation Temperature, Tg	576 °C	1070 °F	per thermal expansion curve
Softening Point	718 °C	1320 °F	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	563 °C	1050 °F	10¹³ poise; ASTM-C336
Strain Point	532 °C	990 °F	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Metric	English	Comments
Refractive Index	1.48899 @Wavelength 2325.42 nm	1.48899 @Wavelength 2325.42 nm
	1.49462 @Wavelength 1970.09 nm	1.49462 @Wavelength 1970.09 nm
	1.50050 @Wavelength 1529.58 nm	1.50050 @Wavelength 1529.58 nm
	1.50536 @Wavelength 1128.64 nm	1.50536 @Wavelength 1128.64 nm
	1.50686 @Wavelength 1013.98 nm	1.50686 @Wavelength 1013.98 nm	nt (Hg t line)
	1.50935 @Wavelength 852.11 nm	1.50935 @Wavelength 852.11 nm	ns (Cs s line)
	1.51097 @Wavelength 768.19 nm	1.51097 @Wavelength 768.19 nm	nA' (K A' line)
	1.51243 @Wavelength 706.52 nm	1.51243 @Wavelength 706.52 nm	nr (He r line)
	1.51386 @Wavelength 656.27 nm	1.51386 @Wavelength 656.27 nm	nC (H C line)
	1.51425 @Wavelength 643.85 nm	1.51425 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.51462 @Wavelength 632.8 nm	1.51462 @Wavelength 632.8 nm	nHe-Ne
	1.51626 @Wavelength 589.29 nm	1.51626 @Wavelength 589.29 nm	nD (Na D line)
	1.51633 @Wavelength 587.56 nm	1.51633 @Wavelength 587.56 nm	nd (He D line)
	1.51825 @Wavelength 546.07 nm	1.51825 @Wavelength 546.07 nm	ne (Hg e line)
	1.52191 @Wavelength 486.13 nm	1.52191 @Wavelength 486.13 nm	nf (H F line)
	1.52236 @Wavelength 479.99 nm	1.52236 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.52564 @Wavelength 441.57 nm	1.52564 @Wavelength 441.57 nm	nHe-Cd
	1.52621 @Wavelength 435.835 nm	1.52621 @Wavelength 435.835 nm	ng (Hg g line)
	1.52977 @Wavelength 404.656 nm	1.52977 @Wavelength 404.656 nm	nh (Hg h line)
	1.53578 @Wavelength 365.015 nm	1.53578 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	63.93	63.93	ν e
	64.14	64.14	ν d
Optical Dispersion	0.002475	0.002475	nd-nC; Partial Dispersion
	0.002882	0.002882	nC-nA'; Partial Dispersion
	0.003554	0.003554	nh-ng; Partial Dispersion
	0.0040	0.0040	ne-nC'; Partial Dispersion
	0.004107	0.004107	nF'-ne; Partial Dispersion
	0.004309	0.004309	ng-nF; Partial Dispersion
	0.004396	0.004396	ne-nC; Partial Dispersion
	0.006993	0.006993	nC-nt; Partial Dispersion
	0.007389	0.007389	nC'-nt; Partial Dispersion
	0.00805	0.00805	nF-nC
	0.008107	0.008107	nF'-nC'
	0.009571	0.009571	ni-ng; Partial Dispersion
	0.009884	0.009884	ng-nd; Partial Dispersion
	0.013427	0.013427	ni-nF'; Partial Dispersion
Transmission, Visible	99.1 % @Wavelength 380 nm	99.1 % @Wavelength 380 nm
	99.5 % @Wavelength 440 nm	99.5 % @Wavelength 440 nm
	99.5 % @Wavelength 460 nm	99.5 % @Wavelength 460 nm
	99.6 % @Wavelength 390 nm	99.6 % @Wavelength 390 nm
	99.6 % @Wavelength 420 nm	99.6 % @Wavelength 420 nm
	99.6 % @Wavelength 480 nm	99.6 % @Wavelength 480 nm
	99.6 % @Wavelength 500 nm	99.6 % @Wavelength 500 nm
	99.7 % @Wavelength 400 nm	99.7 % @Wavelength 400 nm
	99.7 % @Wavelength 600 nm	99.7 % @Wavelength 600 nm
	99.7 % @Wavelength 650 nm	99.7 % @Wavelength 650 nm
	99.8 % @Wavelength 550 nm	99.8 % @Wavelength 550 nm
	99.8 % @Wavelength 700 nm	99.8 % @Wavelength 700 nm
IR Transmittance	85 % @Wavelength 2400 nm	85 % @Wavelength 2400 nm
	89 % @Wavelength 2200 nm	89 % @Wavelength 2200 nm
	98 % @Wavelength 1800 nm	98 % @Wavelength 1800 nm
	98.2 % @Wavelength 1400 nm	98.2 % @Wavelength 1400 nm
	99.1 % @Wavelength 1600 nm	99.1 % @Wavelength 1600 nm
	99.5 % @Wavelength 1200 nm	99.5 % @Wavelength 1200 nm
	99.6 % @Wavelength 1000 nm	99.6 % @Wavelength 1000 nm
	99.7 % @Wavelength 900 nm	99.7 % @Wavelength 900 nm
	99.8 % @Wavelength 800 nm	99.8 % @Wavelength 800 nm
UV Transmittance	8.0 % @Wavelength 290 nm	8.0 % @Wavelength 290 nm
	31 % @Wavelength 300 nm	31 % @Wavelength 300 nm
	58 % @Wavelength 310 nm	58 % @Wavelength 310 nm
	77 % @Wavelength 320 nm	77 % @Wavelength 320 nm
	88 % @Wavelength 330 nm	88 % @Wavelength 330 nm
	94 % @Wavelength 340 nm	94 % @Wavelength 340 nm
	96.8 % @Wavelength 350 nm	96.8 % @Wavelength 350 nm
	98.4 % @Wavelength 360 nm	98.4 % @Wavelength 360 nm
	99.1 % @Wavelength 370 nm	99.1 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	1
CCI	0.00 B
	0.08 G
	0.08 R
coloring, λ 5	285
coloring, λ 80	330
Coloring, Internal Transmission λ 0.05	289
Coloring, Internal Transmission λ 0.80	323
Knoop Hardness Class	6
Melt Frequency	1
Ohara Code d	516641
Ohara Code e	518639
Ohara Status	Preferred
Phosphate Resistance, PR	2
Photoelastic Constant (ß)	2.79
Relative Price	1		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)	625		per thermal expansion curve

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CZOHARA854 / 192121

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