Ohara S-NPH 7 Optical Glass

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Ohara S-NPH 7 Optical Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	S-NPH7 is an optical glass with negative nd/dT values. In Automotive camera lens systems, the focal length is often a fixed distance. Refractive index fluctuations within the optical system should certainly be a consideration, as cars are used in environments where the temperature range can vary widely from below zero in colder climates to more that 50°C inside a car on a summer day. Since many optical glasses (including others in the NPH family) have positive dn/dT values, the refractive indices fluctuations due to temperature change can be adjusted efficiently when these materials are combined with S-NPH7. In addition to Automotive camera lens systems, S-NPH7 can also be used for Projectors, Interchangeable Photographic lenses, and various other applications. Information provided by Ohara Corporation.
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Physical Properties	Original Value	Comments

Specific Gravity	3.30 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	1.0

Mechanical Properties	Original Value	Comments
Hardness, Knoop	350 @Load 0.0999 kg
Modulus of Elasticity	75.3 GPa
Modulus of Rigidity	29.6 GPa
Poissons Ratio	0.269
Abrasion	448	Aa

Thermal Properties	Original Value	Comments
CTE, linear	10.9 µm/m-°C @Temperature -30.0 - 70.0 °C
	13.0 µm/m-°C @Temperature 100 - 300 °C
Thermal Conductivity	0.826 W/m-K @Temperature 35.0 °C
Transformation Temperature, Tg	569 °C	per thermal expansion curve
Softening Point	630 °C	10^7.65 poise; JIS-R3104 and ASTM-C338
Annealing Point	541 °C	10¹³ poise; ASTM-C336
Strain Point	520 °C	10^14.5 poise; JIS-R3103 and ASTM-C336

Optical Properties	Original Value	Comments
Refractive Index	1.72077 @Wavelength 2325.42 nm
	1.7275 @Wavelength 1970.09 nm
	1.73544 @Wavelength 1529.58 nm
	1.74406 @Wavelength 1128.64 nm
	1.74749 @Wavelength 1013.98 nm	nt (Hg t line)
	1.75417 @Wavelength 852.11 nm	ns (Cs s line)
	1.75917 @Wavelength 768.19 nm	nA' (K A' line)
	1.764 @Wavelength 706.52 nm	nr (He r line)
	1.76902 @Wavelength 656.27 nm	nC (H C line)
	1.77046 @Wavelength 643.85 nm	nC' (Cd C' line)
	1.77182 @Wavelength 632.8 nm	nHe-Ne
	1.77802 @Wavelength 589.29 nm	nD
	1.7783 @Wavelength 587.56 nm	nd (He D line)
	1.78595 @Wavelength 546.07 nm	ne (Hg e line)
	1.80157 @Wavelength 486.13 nm	nf (H F line)
	1.80361 @Wavelength 479.99 nm	nF' (Cd F' line)
	1.81909 @Wavelength 441.57 nm	nHe-Cd
	1.82191 @Wavelength 435.835 nm	ng (Hg g line)
	1.84053 @Wavelength 404.656 nm	nh (Hg h line)
Abbe Number	23.71	ν e
	23.91	ν d
Optical Dispersion	0.009276	nd-nC; Partial Dispersion
	0.009855	nC-nA'; Partial Dispersion
	0.015492	ne-nC'; Partial Dispersion
	0.01693	ne-nC; Partial Dispersion
	0.017655	nF'-ne; Partial Dispersion
	0.018622	nh-ng; Partial Dispersion
	0.020338	ng-nF; Partial Dispersion
	0.021538	nC-nt; Partial Dispersion
	0.022976	nC'-nt; Partial Dispersion
	0.032549	nF-nC
	0.033147	nF'-nC'
	0.043611	ng-nd; Partial Dispersion
Transmission, Visible	45 % @Thickness 10.0 mm, Wavelength 380 nm	Internal Transmission
	74 % @Thickness 10.0 mm, Wavelength 390 nm	Internal Transmission
	87 % @Thickness 10.0 mm, Wavelength 400 nm	Internal Transmission
	94.9 % @Thickness 10.0 mm, Wavelength 420 nm	Internal Transmission
	97.1 % @Thickness 10.0 mm, Wavelength 440 nm	Internal Transmission
	98 % @Thickness 10.0 mm, Wavelength 460 nm	Internal Transmission
	98.6 % @Thickness 10.0 mm, Wavelength 480 nm	Internal Transmission
	99 % @Thickness 10.0 mm, Wavelength 500 nm	Internal Transmission
	99.6 % @Thickness 10.0 mm, Wavelength 550 nm	Internal Transmission
	99.7 % @Thickness 10.0 mm, Wavelength 600 nm	Internal Transmission
	99.7 % @Thickness 10.0 mm, Wavelength 650 nm	Internal Transmission
	99.7 % @Thickness 10.0 mm, Wavelength 700 nm	Internal Transmission
IR Transmittance	92 % @Thickness 10.0 mm, Wavelength 2400 nm	Internal Transmission
	95.1 % @Thickness 10.0 mm, Wavelength 2200 nm	Internal Transmission
	97 % @Thickness 10.0 mm, Wavelength 2000 nm	Internal Transmission
	98.4 % @Thickness 10.0 mm, Wavelength 1800 nm	Internal Transmission
	99.5 % @Thickness 10.0 mm, Wavelength 1600 nm	Internal Transmission
	99.8 % @Thickness 10.0 mm, Wavelength 800 nm	Internal Transmission
	99.8 % @Thickness 10.0 mm, Wavelength 900 nm	Internal Transmission
	99.8 % @Thickness 10.0 mm, Wavelength 1000 nm	Internal Transmission
	99.9 % @Thickness 10.0 mm, Wavelength 1200 nm	Internal Transmission
	99.9 % @Thickness 10.0 mm, Wavelength 1400 nm	Internal Transmission
UV Transmittance	11 % @Thickness 10.0 mm, Wavelength 370 nm	Internal Transmission

Descriptive Properties
Acid Resistance, Powder Method, RA(P)	1
CCI	0.00 B
	2.61 G
	2.61 R
coloring, λ 5	370
coloring, λ 80	420
Coloring, Internal Transmission λ 0.05	365
Coloring, Internal Transmission λ 0.80	395
Knoop Hardness Class	4
Ohara Code d	778239
Ohara Code e	786237
Phosphate Resistance, PR	1
Photoelastic Constant (ß)	3.45
Water Resistance, RW(P)	1
Weathering Resistance (Surface Method) W(S)max	2
Yield Point, At (°C)	598	per thermal expansion curve

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CZOHARA783 / 281622

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