Ohara S-TIH 4 Optical Glass

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Ohara S-TIH 4 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	3.15 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	91.9 GPa
Modulus of Rigidity	36.7 GPa
Poissons Ratio	0.254
Abrasion	168	Aa

Thermal Properties	Original Value	Comments
CTE, linear	8.50 µm/m-°C @Temperature -30.0 - 70.0 °C
	10.0 µm/m-°C @Temperature 100 - 300 °C
Thermal Conductivity	1.01 W/m-K @Temperature 35.0 °C
Transformation Temperature, Tg	613 °C	per thermal expansion curve
Softening Point	694 °C	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	591 °C	10¹³ poise; ASTM-C336
Strain Point	565 °C	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Original Value	Comments
Refractive Index	1.70430 @Wavelength 2325.42 nm
	1.71054 @Wavelength 1970.09 nm
	1.71784 @Wavelength 1529.58 nm
	1.72561 @Wavelength 1128.64 nm
	1.72864 @Wavelength 1013.98 nm	nt (Hg t line)
	1.73448 @Wavelength 852.11 nm	ns (Cs s line)
	1.73882 @Wavelength 768.19 nm	nA' (K A' line)
	1.74299 @Wavelength 706.52 nm	nr (He r line)
	1.74730 @Wavelength 656.27 nm	nC (H C line)
	1.74853 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.74968 @Wavelength 632.8 nm	nHe-Ne
	1.75496 @Wavelength 589.29 nm	nD (Na D line)
	1.75520 @Wavelength 587.56 nm	nd (He D line)
	1.76167 @Wavelength 546.07 nm	ne (Hg e line)
	1.77475 @Wavelength 486.13 nm	nf (H F line)
	1.77644 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.78920 @Wavelength 441.57 nm	nHe-Cd
	1.79150 @Wavelength 435.835 nm	ng (Hg g line)
	1.80656 @Wavelength 404.656 nm	nh (Hg h line)
Abbe Number	27.29	ν e
	27.51	ν d
Optical Dispersion	0.007904	nd-nC; Partial Dispersion
	0.008473	nC-nA'; Partial Dispersion
	0.013146	ne-nC'; Partial Dispersion
	0.014376	ne-nC; Partial Dispersion
	0.014765	nF'-ne; Partial Dispersion
	0.015059	nh-ng; Partial Dispersion
	0.016752	ng-nF; Partial Dispersion
	0.018659	nC-nt; Partial Dispersion
	0.019889	nC'-nt; Partial Dispersion
	0.02745	nF-nC
	0.027911	nF'-nC'
	0.036298	ng-nd; Partial Dispersion
Transmission, Visible	45 % @Wavelength 380 nm
	70 % @Wavelength 390 nm
	82 % @Wavelength 400 nm
	92.9 % @Wavelength 420 nm
	96.2 % @Wavelength 440 nm
	97.3 % @Wavelength 460 nm
	98 % @Wavelength 480 nm
	98.6 % @Wavelength 500 nm
	99.3 % @Wavelength 650 nm
	99.4 % @Wavelength 600 nm
	99.5 % @Wavelength 550 nm
	99.5 % @Wavelength 700 nm
IR Transmittance	94.2 % @Wavelength 2400 nm
	96.1 % @Wavelength 2200 nm
	98.7 % @Wavelength 1800 nm
	99.4 % @Wavelength 1600 nm
	99.5 % @Wavelength 1400 nm
	99.7 % @Wavelength 1200 nm
	99.9 % @Wavelength 800 nm
	99.9 % @Wavelength 900 nm
	99.9 % @Wavelength 1000 nm
UV Transmittance	12 % @Wavelength 370 nm

Descriptive Properties
Acid Resistance, Powder Method, RAP)	1
CCI	0.00 B
	3.28 G
	3.28 R
coloring, λ 5	365
coloring, λ 80	415
Coloring, Internal Transmission λ 0.05	368
Coloring, Internal Transmission λ 0.80	398
Knoop Hardness Class	6
Melt Frequency	2
Ohara Code d	755275
Ohara Code e	762273
Ohara Status	Preferred
Phosphate Resistance, PR	1
Photoelastic Constant (ß)	2.76
Relative Price	4	S-BSL7 = 1
Water Resistance, RW(P)	2
Weathering Resistance (Surface Method) W(S)max	1
Weathering Resistance (Surface Method) W(S)min	2
Yield Point, At (°C)	640	per thermal expansion curve

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CZOHARA940 / 192205

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