Ohara L-PHL2 Low Tg Optical Glass

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Ohara L-PHL2 Low Tg Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	Information provided by Ohara Corporation.
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Physical Properties	Original Value	Comments

Specific Gravity	3.03 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	51.1

Mechanical Properties	Original Value	Comments
Hardness, Knoop	370 @Load 0.0999 kg
Modulus of Elasticity	64.5 GPa
Modulus of Rigidity	25.3 GPa
Poissons Ratio	0.272
Abrasion	468	Aa

Thermal Properties	Original Value	Comments
CTE, linear	9.90 µm/m-°C @Temperature -30.0 - 70.0 °C
	13.0 µm/m-°C @Temperature 100 - 300 °C
Thermal Conductivity	0.683 W/m-K @Temperature 35.0 °C
Transformation Temperature, Tg	381 °C	per thermal expansion curve
Softening Point	440 °C	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	359 °C	10¹³ poise; ASTM-C336
Strain Point	337 °C	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Original Value	Comments
Refractive Index	1.53345 @Wavelength 2325.42 nm
	1.53809 @Wavelength 1970.09 nm
	1.54303 @Wavelength 1529.58 nm
	1.54736 @Wavelength 1128.64 nm
	1.54879 @Wavelength 1013.98 nm	nt (Hg t line)
	1.55129 @Wavelength 852.11 nm	ns (Cs s line)
	1.55298 @Wavelength 768.19 nm	nA' (K A' line)
	1.55454 @Wavelength 706.52 nm	nr (He r line)
	1.55608 @Wavelength 656.27 nm	nC (H C line)
	1.55652 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.55692 @Wavelength 632.8 nm	nHe-Ne
	1.55872 @Wavelength 589.29 nm	nD (Na D line)
	1.55880 @Wavelength 587.56 nm	nd (He D line)
	1.56093 @Wavelength 546.07 nm	ne (Hg e line)
	1.56502 @Wavelength 486.13 nm	nf (H F line)
	1.56552 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.56922 @Wavelength 441.57 nm	nHe-Cd
	1.56987 @Wavelength 435.835 nm	ng (Hg g line)
	1.57389 @Wavelength 404.656 nm	nh (Hg h line)
	1.58073 @Wavelength 365.015 nm	ni (Hg i line)
Abbe Number	62.26	ν e
	62.55	ν d
Optical Dispersion	0.008933	nF-nC
	0.009009	nF'-nC'
Transmission, Visible	99.5 % @Wavelength 380 nm
	99.7 % @Wavelength 390 nm
	99.7 % @Wavelength 400 nm
	99.7 % @Wavelength 420 nm
	99.7 % @Wavelength 440 nm
	99.7 % @Wavelength 460 nm
	99.7 % @Wavelength 480 nm
	99.8 % @Wavelength 500 nm
	99.8 % @Wavelength 650 nm
	99.9 % @Wavelength 550 nm
	99.9 % @Wavelength 600 nm
	99.9 % @Wavelength 700 nm
IR Transmittance	86 % @Wavelength 2400 nm
	89 % @Wavelength 2200 nm
	96.4 % @Wavelength 1800 nm
	98.9 % @Wavelength 1600 nm
	99.8 % @Wavelength 1400 nm
	99.9 % @Wavelength 800 nm
	99.9 % @Wavelength 900 nm
	99.9 % @Wavelength 1000 nm
	99.9 % @Wavelength 1200 nm
UV Transmittance	1.0 % @Wavelength 300 nm
	16 % @Wavelength 310 nm
	49 % @Wavelength 320 nm
	75 % @Wavelength 330 nm
	89 % @Wavelength 340 nm
	95.4 % @Wavelength 350 nm
	98 % @Wavelength 360 nm
	99.1 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	5
coloring, λ 5	330
coloring, λ 80	340
Knoop Hardness Class	4
Ohara Code d	559625
Ohara Code e	561623
Phosphate Resistance, PR	4.1
Photoelastic Constant (ß)	2.99
Relative Price	12	S-BSL7 = 1
Water Resistance, RW(P)	1
Weathering Resistance (Surface Method) W(S)max	3
Weathering Resistance (Surface Method) W(S)min	4
Yield Point, At (°C)	407	per thermal expansion curve

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CZOHARA827 / 192102

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