LAF70 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAF70 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.7495 and a Vd of 35.0. It has average chemical resistance and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.27–2.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.27–2.0 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.340–2.000 µm
Optical Properties
Refractive Index (nd) 1.7495
Abbe Number (Vd) 35.0
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.96739 - 0.0129794\,\lambda^2 + 0.0305856\,\lambda^{-2} + 0.00114095\,\lambda^{-4} - 3.36726 \times 10^{-5}\,\lambda^{-6} + 6.97337 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 6.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.4
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 5
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-LAF4GT CDGM 1.7495 34.989266
H-LAF4 CDGM 1.7495 34.989266
E-LAF7 Hoya 1.7495 35.04
LAF7 Hoya 1.749497 35.042695
LAFN7 Schott 1.7495 34.95
N-LAF7 Schott 1.7495 34.82
LAM7 Ohara 1.749497 35.278026
S-LAM7 Ohara 1.749497 35.283397
S-NBH51 Ohara 1.749504 35.33248
NBFD6 Hoya 1.756702 36.345258
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LAFN12 Sumita 1.7569 31.7
KZFS50 Sumita 1.74 31.7
BASF8 Sumita 1.72342 38.0
LAFN9 Sumita 1.764 40.3
ZNSF8 Sumita 1.7143 38.9
K-ZnSF8 Sumita 1.7143 38.9
K-ZnSF8(M) Sumita 1.71143 38.9
SF18 Sumita 1.72151 29.3
CD120 Sumita 1.7225 29.2
K-CD120 Sumita 1.7225 29.2
Compare Glasses
    Compare Selected