K-VC174 by Sumita

Standard Rare Precision Molding Environmentally Friendly

K-VC174 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.30 to 2.00 µm with an nd of 1.7485 and a Vd of 45.3. It has medium thermal expansion (CTE of 8.3×10⁻⁶/K), good chemical resistance, and precision molding compatibility.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–2.000 µm
Optical Properties
Refractive Index (nd) 1.7485
Abbe Number (Vd) 45.3
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.98405 - 0.0124094\,\lambda^2 + 0.0249481\,\lambda^{-2} + 0.000640743\,\lambda^{-4} - 1.12382 \times 10^{-5}\,\lambda^{-6} + 1.88243 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.3
TCE 100/300°C (10-6/K) 10.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-3.16 \times 10^{-6} + 2(1.43 \times 10^{-8})\,\Delta T + 3(-9.72 \times 10^{-11})\,\Delta T^2 + \frac{6.22 \times 10^{-7} + 2(4.32 \times 10^{-10})\,\Delta T}{\lambda - 0.214}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.92
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-LAF3B CDGM 1.744 44.900027
LAF2 Hoya 1.744 44.9
LAF20 Hoya 1.744 44.872914
N-LAF2 Schott 1.74397 44.85
D44-45 Corning 1.744001 44.818533
LAM2 Ohara 1.743997 44.787528
S-LAM2 Ohara 1.743997 44.786431
LAF2 Schott 1.744002 44.719972
P-LAF37 Schott 1.7555 45.66
H-LAF6LA CDGM 1.757 47.711817
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-VC82(M) Sumita 1.75028 45.4
K-VC174(M) Sumita 1.74578 45.1
LAF2 Sumita 1.744 44.9
K-LaF2 Sumita 1.744 44.9
VC81 Sumita 1.75512 45.6
K-VC82 Sumita 1.7555 45.6
K-GIR140 Sumita 1.75106 43.1
LAFN8 Sumita 1.756 47.6
K-LaFn11 Sumita 1.72013 46.0
LAFN11 Sumita 1.72013 46.0
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