VC78 by Sumita

Obsolete Very Rare Environmentally Dangerous

VC78 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.27 to 2.00 µm with an nd of 1.6691 and a Vd of 55.4. 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: 0.270–2.000 µm
Optical Properties
Refractive Index (nd) 1.6691
Abbe Number (Vd) 55.4
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.73514 - 0.0118221\,\lambda^2 + 0.0182791\,\lambda^{-2} + 0.000179858\,\lambda^{-4} + 1.6773 \times 10^{-5}\,\lambda^{-6} - 5.30706 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 10.0
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) 3.44
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
D-LAK70 CDGM 1.6691 55.389689
D-LAK70-25 CDGM 1.668 55.295752
H-LAK11 CDGM 1.66461 54.612239
S-LAL12Q Ohara 1.6779 55.346888
S-LAL12 Ohara 1.6779 55.341195
LAL12 Ohara 1.6779 55.337587
H-LAK5A CDGM 1.6779 55.51497
LAC12 Hoya 1.6779 55.52
D-LAK5-25 CDGM 1.67686 54.805426
N-LAK12 Schott 1.6779 55.2
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-VC78 Sumita 1.66955 55.4
K-VC78(M) Sumita 1.66624 55.1
K-LaK12 Sumita 1.6779 55.5
LAK12 Sumita 1.6779 55.5
LAKN4 Sumita 1.671 57.2
K-LaKn4 Sumita 1.671 57.2
LAK11 Sumita 1.6583 57.3
K-LaK11 Sumita 1.6583 57.3
LAKN9 Sumita 1.678 53.3
LAKN11 Sumita 1.6583 53.4
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