Ohara S-YGH51 Optical Glass

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Ohara S-YGH51 Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	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	4.40 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	51

Mechanical Properties	Original Value	Comments
Hardness, Knoop	720 @Load 0.0999 kg
Modulus of Elasticity	122.2 GPa
Modulus of Rigidity	47.3 GPa
Poissons Ratio	0.291
Abrasion	61	Aa

Thermal Properties	Original Value	Comments
CTE, linear	5.80 µm/m-°C @Temperature -30.0 - 70.0 °C
	7.00 µm/m-°C @Temperature 100 - 300 °C
Thermal Conductivity	0.842 W/m-K @Temperature 35.0 °C
Transformation Temperature, Tg	700 °C	per thermal expansion curve
Softening Point	738 °C	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	670 °C	10¹³ poise; ASTM-C336
Strain Point	651 °C	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Original Value	Comments
Refractive Index	1.71387 @Wavelength 2325.42 nm
	1.72153 @Wavelength 1970.09 nm
	1.72961 @Wavelength 1529.58 nm
	1.73662 @Wavelength 1128.64 nm
	1.73893 @Wavelength 1013.98 nm	nt (Hg t line)
	1.74292 @Wavelength 852.11 nm	ns (Cs s line)
	1.74565 @Wavelength 768.19 nm	nA' (K A' line)
	1.74814 @Wavelength 706.52 nm	nr (He r line)
	1.75062 @Wavelength 656.27 nm	nC (H C line)
	1.75132 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.75197 @Wavelength 632.8 nm	nHe-Ne
	1.75487 @Wavelength 589.29 nm	nD (Na D line)
	1.75500 @Wavelength 587.56 nm	nd (He D line)
	1.75844 @Wavelength 546.07 nm	ne (Hg e line)
	1.76505 @Wavelength 486.13 nm	nf (H F line)
	1.76588 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.77191 @Wavelength 441.57 nm	nHe-Cd
	1.77296 @Wavelength 435.835 nm	ng (Hg g line)
	1.77954 @Wavelength 404.656 nm	nh (Hg h line)
	1.79083 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	52.08	ν e
	52.32	ν d
Optical Dispersion	0.014431	nF-nC
	0.014562	nF'-nC'
Transmission, Visible	95.6 % @Wavelength 380 nm
	97.2 % @Wavelength 390 nm
	98 % @Wavelength 400 nm
	98.8 % @Wavelength 420 nm
	99.1 % @Wavelength 440 nm
	99.4 % @Wavelength 460 nm
	99.6 % @Wavelength 480 nm
	99.7 % @Wavelength 500 nm
	99.8 % @Wavelength 550 nm
	99.8 % @Wavelength 600 nm
	99.8 % @Wavelength 650 nm
	99.8 % @Wavelength 700 nm
IR Transmittance	62 % @Wavelength 2400 nm
	88 % @Wavelength 2200 nm
	98.4 % @Wavelength 1800 nm
	99.3 % @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	3.0 % @Wavelength 280 nm
	12 % @Wavelength 290 nm
	21 % @Wavelength 300 nm
	24 % @Wavelength 310 nm
	47 % @Wavelength 320 nm
	61 % @Wavelength 330 nm
	73 % @Wavelength 340 nm
	82 % @Wavelength 350 nm
	88 % @Wavelength 360 nm
	93 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	4
coloring, λ 5	280
coloring, λ 80	370
Knoop Hardness Class	7
Melt Frequency	5
Ohara Code d	755523
Ohara Code e	758521
Ohara Status	Standard
Phosphate Resistance, PR	2
Photoelastic Constant (ß)	1.48
Relative Price	13.5	S-BSL7 = 1
Water Resistance, RW(P)	1
Weathering Resistance (Surface Method) W(S)max	1
Yield Point, At (°C)	712	per thermal expansion curve

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CZOHARA967 / 192232

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