Ohara S-BAL14 Optical Glass

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Ohara S-BAL14 Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Boron is an important constituent. ECO optical glass that does not contain any lead or arsenic. Information provided by Ohara Corporation.
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Physical Properties	Original Value	Comments

Specific Gravity	2.89 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	1.0

Mechanical Properties	Original Value	Comments
Hardness, Knoop	570 @Load 0.0999 kg
Modulus of Elasticity	81.1 GPa
Modulus of Rigidity	32.7 GPa
Poissons Ratio	0.24
Abrasion	134	Aa

Thermal Properties	Original Value	Comments
CTE, linear	8.00 µm/m-°C @Temperature -30.0 - 70.0 °C
	9.30 µm/m-°C @Temperature 100 - 300 °C
Thermal Conductivity	0.967 W/m-K @Temperature 35.0 °C
Transformation Temperature, Tg	580 °C	per thermal expansion curve
Softening Point	700 °C	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	562 °C	10¹³ poise; ASTM-C336
Strain Point	533 °C	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Original Value	Comments
Refractive Index	1.54050 @Wavelength 2325.42 nm
	1.54565 @Wavelength 1970.09 nm
	1.55116 @Wavelength 1529.58 nm
	1.55601 @Wavelength 1128.64 nm
	1.55761 @Wavelength 1013.98 nm	nt (Hg t line)
	1.56040 @Wavelength 852.11 nm	ns (Cs s line)
	1.56230 @Wavelength 768.19 nm	nA' (K A' line)
	1.56404 @Wavelength 706.52 nm	nr (He r line)
	1.56577 @Wavelength 656.27 nm	nC (H C line)
	1.56626 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.56671 @Wavelength 632.8 nm	nHe-Ne
	1.56874 @Wavelength 589.29 nm	nD (Na D line)
	1.56883 @Wavelength 587.56 nm	nd (He D line)
	1.57124 @Wavelength 546.07 nm	ne (Hg e line)
	1.57587 @Wavelength 486.13 nm	nf (H F line)
	1.57645 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.58067 @Wavelength 441.57 nm	nHe-Cd
	1.58141 @Wavelength 435.835 nm	ng (Hg g line)
	1.58604 @Wavelength 404.656 nm	nh (Hg h line)
	1.59400 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	56.09	ν e
	56.36	ν d
Optical Dispersion	0.003057	nd-nC; Partial Dispersion
	0.003476	nC-nA'; Partial Dispersion
	0.004629	nh-ng; Partial Dispersion
	0.004976	ne-nC'; Partial Dispersion
	0.005209	nF'-ne; Partial Dispersion
	0.005462	ne-nC; Partial Dispersion
	0.005539	ng-nF; Partial Dispersion
	0.008164	nC-nt; Partial Dispersion
	0.00865	nC'-nt; Partial Dispersion
	0.010092	nF-nC
	0.010185	nF'-nC'
	0.012574	ng-nd; Partial Dispersion
	0.012595	ni-ng; Partial Dispersion
	0.017555	ni-nF'; Partial Dispersion
Transmission, Visible	97 % @Wavelength 380 nm
	98.3 % @Wavelength 390 nm
	98.9 % @Wavelength 400 nm
	99.2 % @Wavelength 420 nm
	99.3 % @Wavelength 440 nm
	99.4 % @Wavelength 460 nm
	99.5 % @Wavelength 480 nm
	99.7 % @Wavelength 500 nm
	99.7 % @Wavelength 650 nm
	99.8 % @Wavelength 550 nm
	99.8 % @Wavelength 600 nm
	99.8 % @Wavelength 700 nm
IR Transmittance	86 % @Wavelength 2400 nm
	91.4 % @Wavelength 2200 nm
	98.3 % @Wavelength 1800 nm
	98.9 % @Wavelength 1400 nm
	99.3 % @Wavelength 1600 nm
	99.7 % @Wavelength 1000 nm
	99.7 % @Wavelength 1200 nm
	99.8 % @Wavelength 800 nm
	99.8 % @Wavelength 900 nm
UV Transmittance	9.0 % @Wavelength 330 nm
	44 % @Wavelength 340 nm
	74 % @Wavelength 350 nm
	88 % @Wavelength 360 nm
	94.6 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	1
CCI	0.00 B
	0.26 G
	0.26 R
coloring, λ 5	325
coloring, λ 80	360
Coloring, Internal Transmission λ 0.05	329
Coloring, Internal Transmission λ 0.80	354
Knoop Hardness Class	6
Melt Frequency	1
Ohara Code d	569563
Ohara Code e	571561
Ohara Status	Preferred
Phosphate Resistance, PR	2
Photoelastic Constant (ß)	2.32
Relative Price	2.5	S-BSL7 = 1
Water Resistance, RW(P)	3
Weathering Resistance (Surface Method) W(S)max	2
Weathering Resistance (Surface Method) W(S)min	3
Yield Point, At (°C)	622	per thermal expansion curve

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