S-NPH7 by Ohara

Standard Medium Environmentally Friendly

S-NPH7 by Ohara is a standard optical glass with a medium melt frequency. It transmits from 0.37 to 2.40 µm with an nd of 1.7783 and a Vd of 23.911598. It has medium thermal expansion (CTE of 10.9×10⁻⁶/K), good chemical resistance, and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.404656–2.32542 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.404656–2.32542 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.370–2.400 µm
Optical Properties
Refractive Index (nd) 1.7783
Abbe Number (Vd) 23.911598
Dispersion Formula Sellmeier
Wavelength Range 0.404656 — 2.32542 µm
$$n(\lambda) = \sqrt{1 + \frac{1.68237\,\lambda^2}{\lambda^2 - 0.0131432} + \frac{0.33965\,\lambda^2}{\lambda^2 - 0.064504} + \frac{2.25049\,\lambda^2}{\lambda^2 - 181.386}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 10.9
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.34 \times 10^{-5} + 2(4.63 \times 10^{-9})\,\Delta T + 3(-1.77 \times 10^{-11})\,\Delta T^2 + \frac{1.02 \times 10^{-6} + 2(1.36 \times 10^{-9})\,\Delta T}{\lambda - 0.305}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.3
Relative Cost 4.2
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance 1
Notes

NEW GLASS!! Recommended

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