Ohara S-BAL35 Optical Glass

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Ohara S-BAL35 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	Metric	English	Comments

Specific Gravity	3.31 g/cc	3.31 g/cc

Chemical Properties	Metric	English	Comments
Acid Class, SR	4.2	4.2

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	590 @Load 0.0999 kg	590 @Load 0.220 lb
Modulus of Elasticity	83.2 GPa	12100 ksi
Modulus of Rigidity	33.3 GPa	4830 ksi
Poissons Ratio	0.25	0.25
Abrasion	115	115	Aa

Thermal Properties	Metric	English	Comments
CTE, linear	5.70 µm/m-°C @Temperature -30.0 - 70.0 °C	3.17 µin/in-°F @Temperature -22.0 - 158 °F
	6.70 µm/m-°C @Temperature 100 - 300 °C	3.72 µin/in-°F @Temperature 212 - 572 °F
Thermal Conductivity	0.915 W/m-K @Temperature 35.0 °C	6.35 BTU-in/hr-ft²-°F @Temperature 95.0 °F
Transformation Temperature, Tg	669 °C	1240 °F	per thermal expansion curve
Softening Point	768 °C	1410 °F	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	646 °C	1190 °F	10¹³ poise; ASTM-C336
Strain Point	619 °C	1150 °F	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Metric	English	Comments
Refractive Index	1.55959 @Wavelength 2325.42 nm	1.55959 @Wavelength 2325.42 nm
	1.56531 @Wavelength 1970.09 nm	1.56531 @Wavelength 1970.09 nm
	1.57134 @Wavelength 1529.58 nm	1.57134 @Wavelength 1529.58 nm
	1.57648 @Wavelength 1128.64 nm	1.57648 @Wavelength 1128.64 nm
	1.57813 @Wavelength 1013.98 nm	1.57813 @Wavelength 1013.98 nm	nt (Hg t line)
	1.58093 @Wavelength 852.11 nm	1.58093 @Wavelength 852.11 nm	ns (Cs s line)
	1.58280 @Wavelength 768.19 nm	1.58280 @Wavelength 768.19 nm	nA' (K A' line)
	1.58450 @Wavelength 706.52 nm	1.58450 @Wavelength 706.52 nm	nr (He r line)
	1.58619 @Wavelength 656.27 nm	1.58619 @Wavelength 656.27 nm	nC (H C line)
	1.58666 @Wavelength 643.85 nm	1.58666 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.58710 @Wavelength 632.8 nm	1.58710 @Wavelength 632.8 nm	nHe-Ne
	1.58904 @Wavelength 589.29 nm	1.58904 @Wavelength 589.29 nm	nD (Na D line)
	1.58913 @Wavelength 587.56 nm	1.58913 @Wavelength 587.56 nm	nd (He D line)
	1.59143 @Wavelength 546.07 nm	1.59143 @Wavelength 546.07 nm	ne (Hg e line)
	1.59582 @Wavelength 486.13 nm	1.59582 @Wavelength 486.13 nm	nf (H F line)
	1.59637 @Wavelength 479.99 nm	1.59637 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.60034 @Wavelength 441.57 nm	1.60034 @Wavelength 441.57 nm	nHe-Cd
	1.60103 @Wavelength 435.835 nm	1.60103 @Wavelength 435.835 nm	ng (Hg g line)
	1.60535 @Wavelength 404.656 nm	1.60535 @Wavelength 404.656 nm	nh (Hg h line)
	1.61268 @Wavelength 365.015 nm	1.61268 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	60.88	60.88	ν e
	61.14	61.14	ν d
Optical Dispersion	0.002942	0.002942	nd-nC; Partial Dispersion
	0.003384	0.003384	nC-nA'; Partial Dispersion
	0.004314	0.004314	nh-ng; Partial Dispersion
	0.004772	0.004772	ne-nC'; Partial Dispersion
	0.004942	0.004942	nF'-ne; Partial Dispersion
	0.00521	0.00521	ng-nF; Partial Dispersion
	0.005241	0.005241	ne-nC; Partial Dispersion
	0.008061	0.008061	nC-nt; Partial Dispersion
	0.00853	0.00853	nC'-nt; Partial Dispersion
	0.009636	0.009636	nF-nC
	0.009714	0.009714	nF'-nC'
	0.011647	0.011647	ni-ng; Partial Dispersion
	0.011904	0.011904	ng-nd; Partial Dispersion
	0.01631	0.01631	ni-nF'; Partial Dispersion
Transmission, Visible	98.3 % @Wavelength 380 nm	98.3 % @Wavelength 380 nm
	98.9 % @Wavelength 390 nm	98.9 % @Wavelength 390 nm
	99.3 % @Wavelength 400 nm	99.3 % @Wavelength 400 nm
	99.5 % @Wavelength 420 nm	99.5 % @Wavelength 420 nm
	99.5 % @Wavelength 440 nm	99.5 % @Wavelength 440 nm
	99.6 % @Wavelength 460 nm	99.6 % @Wavelength 460 nm
	99.7 % @Wavelength 480 nm	99.7 % @Wavelength 480 nm
	99.8 % @Wavelength 500 nm	99.8 % @Wavelength 500 nm
	99.8 % @Wavelength 600 nm	99.8 % @Wavelength 600 nm
	99.8 % @Wavelength 650 nm	99.8 % @Wavelength 650 nm
	99.9 % @Wavelength 550 nm	99.9 % @Wavelength 550 nm
	99.9 % @Wavelength 700 nm	99.9 % @Wavelength 700 nm
IR Transmittance	80 % @Wavelength 2400 nm	80 % @Wavelength 2400 nm
	89 % @Wavelength 2200 nm	89 % @Wavelength 2200 nm
	98.4 % @Wavelength 1400 nm	98.4 % @Wavelength 1400 nm
	98.7 % @Wavelength 1800 nm	98.7 % @Wavelength 1800 nm
	99.4 % @Wavelength 1600 nm	99.4 % @Wavelength 1600 nm
	99.8 % @Wavelength 900 nm	99.8 % @Wavelength 900 nm
	99.8 % @Wavelength 1000 nm	99.8 % @Wavelength 1000 nm
	99.8 % @Wavelength 1200 nm	99.8 % @Wavelength 1200 nm
	99.9 % @Wavelength 800 nm	99.9 % @Wavelength 800 nm
UV Transmittance	1.0 % @Wavelength 300 nm	1.0 % @Wavelength 300 nm
	16 % @Wavelength 310 nm	16 % @Wavelength 310 nm
	43 % @Wavelength 320 nm	43 % @Wavelength 320 nm
	67 % @Wavelength 330 nm	67 % @Wavelength 330 nm
	82 % @Wavelength 340 nm	82 % @Wavelength 340 nm
	90.4 % @Wavelength 350 nm	90.4 % @Wavelength 350 nm
	94.9 % @Wavelength 360 nm	94.9 % @Wavelength 360 nm
	97.2 % @Wavelength 370 nm	97.2 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	4
CCI	0.00 B
	0.17 G
	0.17 R
coloring, λ 5	300
coloring, λ 80	345
Coloring, Internal Transmission λ 0.05	303
Coloring, Internal Transmission λ 0.80	339
Knoop Hardness Class	6
Melt Frequency	1
Ohara Code d	589612
Ohara Code e	591609
Ohara Status	Preferred
Phosphate Resistance, PR	1
Photoelastic Constant (ß)	2.15
Relative Price	2.5		S-BSL7 = 1
Water Resistance, RW(P)	2
Weathering Resistance (Surface Method) W(S)max	2
Weathering Resistance (Surface Method) W(S)min	3
Yield Point, At (°C)	709		per thermal expansion curve

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