Ohara PBM18Y i-Line Optical Glass

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Ohara PBM18Y i-Line Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	i-Line High Homogeneity Glass. Boron is an important constituent. Information provided by Ohara Corporation.
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Physical Properties	Original Value	Comments

Specific Gravity	3.37 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	1.0

Mechanical Properties	Original Value	Comments
Hardness, Knoop	410 @Load 0.0999 kg
Modulus of Elasticity	59.8 GPa
Modulus of Rigidity	24.4 GPa
Poissons Ratio	0.223
Abrasion	132	Aa

Thermal Properties	Original Value	Comments
CTE, linear	8.80 µm/m-°C @Temperature -30.0 - 70.0 °C
	10.0 µm/m-°C @Temperature 100 - 300 °C
Thermal Conductivity	0.865 W/m-K @Temperature 35.0 °C
Transformation Temperature, Tg	441 °C	per thermal expansion curve
Softening Point	565 °C	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	419 °C	10¹³ poise; ASTM-C336
Strain Point	377 °C	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Original Value	Comments
Refractive Index	1.56207 @Wavelength 2325.42 nm
	1.56696 @Wavelength 1970.09 nm
	1.57243 @Wavelength 1529.58 nm
	1.57779 @Wavelength 1128.64 nm
	1.57975 @Wavelength 1013.98 nm	nt (Hg t line)
	1.58338 @Wavelength 852.11 nm	ns (Cs s line)
	1.58599 @Wavelength 768.19 nm	nA' (K A' line)
	1.58846 @Wavelength 706.52 nm	nr (He r line)
	1.59097 @Wavelength 656.27 nm	nC (H C line)
	1.59169 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.59236 @Wavelength 632.8 nm	nHe-Ne
	1.59537 @Wavelength 589.29 nm	nD (Na D line)
	1.59551 @Wavelength 587.56 nm	nd (He D line)
	1.59915 @Wavelength 546.07 nm	ne (Hg e line)
	1.60634 @Wavelength 486.13 nm	nf (H F line)
	1.60725 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.61400 @Wavelength 441.57 nm	nHe-Cd
	1.61520 @Wavelength 435.835 nm	ng (Hg g line)
	1.62284 @Wavelength 404.656 nm	nh (Hg h line)
	1.63656 @Wavelength 365.015 nm	ni (Hg i line)
	1.65255 @Wavelength 334 nm
	1.65795 @Wavelength 326 nm
Abbe Number	38.5	ν e
	38.77	ν d
Optical Dispersion	0.015361	nF-nC
	0.015561	nF'-nC'
Transmission, Visible	99.7 % @Wavelength 380 nm
	99.8 % @Wavelength 390 nm
	99.8 % @Wavelength 400 nm
	99.8 % @Wavelength 420 nm
	99.9 % @Wavelength 440 nm
	99.9 % @Wavelength 460 nm
	99.9 % @Wavelength 480 nm
	99.9 % @Wavelength 500 nm
	99.9 % @Wavelength 550 nm
	99.9 % @Wavelength 600 nm
	99.9 % @Wavelength 650 nm
	99.9 % @Wavelength 700 nm
IR Transmittance	87 % @Wavelength 2400 nm
	90.7 % @Wavelength 2200 nm
	97.9 % @Wavelength 1800 nm
	99.4 % @Wavelength 1600 nm
	99.6 % @Wavelength 1400 nm
	99.8 % @Wavelength 1000 nm
	99.8 % @Wavelength 1200 nm
	99.9 % @Wavelength 800 nm
	99.9 % @Wavelength 900 nm
UV Transmittance	22 % @Wavelength 320 nm
	68 % @Wavelength 330 nm
	91.2 % @Wavelength 340 nm
	97.5 % @Wavelength 350 nm
	99 % @Wavelength 360 nm
	99.3 % @Wavelength 365 nm
	99.5 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	1
coloring, λ 5	315
coloring, λ 80	340
Knoop Hardness Class	4
Melt Frequency	2
Ohara Code d	596387
Ohara Code e	599385
Ohara Status	Preferred
Phosphate Resistance, PR	2
Photoelastic Constant (ß)	2.79
Relative Price	10.0	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)	478	per thermal expansion curve

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CZOHARA835 / 192074

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