NSL7 by Ohara

Obsolete Unknown Environmentally Dangerous

NSL7 by Ohara is an obsolete optical glass. It transmits from 0.30 to 0.90 µm with an nd of 1.511121 and a Vd of 60.485793. It has medium thermal expansion (CTE of 9.0×10⁻⁶/K), excellent chemical resistance, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–0.900 µm
Optical Properties
Refractive Index (nd) 1.511121
Abbe Number (Vd) 60.485793
Dispersion Formula Schott
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{2.25242 - 0.00862619\,\lambda^2 + 0.0111554\,\lambda^{-2} + 0.000207216\,\lambda^{-4} - 2.6893 \times 10^{-7}\,\lambda^{-6} + 3.8725 \times 10^{-8}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.0
TCE 100/300°C (10-6/K) 10.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.541 \times 10^{-7} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.49
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
C7 Hoya 1.511122 60.485929
H-K6 CDGM 1.511125 60.478905
K7 Sumita 1.51112 60.5
K7HT Schott 1.511144 60.466081
K7 Schott 1.51112 60.41
B11-60 Corning 1.510999 60.383147
H-K7 CDGM 1.51478 60.634896
N-ZK7A Schott 1.508054 61.04
K4A CDGM 1.50802 61.052897
ZKN7 Schott 1.508469 61.187789
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
S-NSL5 Ohara 1.522494 59.835417
NSL5 Ohara 1.522494 59.790926
NSL3 Ohara 1.518229 58.966406
S-NSL3 Ohara 1.518229 58.902057
BSL1 Ohara 1.510091 63.635037
S-BSL7R Ohara 1.51633 63.881689
L-BSL7 Ohara 1.51633 64.065129
S-NSL2 Ohara 1.516016 56.858179
S-BSL7 Ohara 1.51633 64.142022
BSL7 Ohara 1.51633 64.150145
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