K-CD300(M) by Sumita

Standard Rare Environmentally Friendly

K-CD300(M) by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.35 to 2.00 µm with an nd of 1.68558 and a Vd of 29.9. It has high thermal expansion (CTE of 11.9×10⁻⁶/K) and good chemical resistance.

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: 0.350–2.000 µm
Optical Properties
Refractive Index (nd) 1.68558
Abbe Number (Vd) 29.9
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.7465 - 0.0102282\,\lambda^2 + 0.0295294\,\lambda^{-2} + 0.00166316\,\lambda^{-4} - 9.35716 \times 10^{-5}\,\lambda^{-6} + 1.41372 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 11.9
TCE 100/300°C (10-6/K) 14.1
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.13 \times 10^{-5} + 2(2.13 \times 10^{-9})\,\Delta T + 3(-3.3 \times 10^{-10})\,\Delta T^2 + \frac{9.62 \times 10^{-7} + 2(1.2 \times 10^{-9})\,\Delta T}{\lambda - 0.275}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.78
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 2
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
L-TIM28 Ohara 1.689479 31.023399
S-TIM28 Ohara 1.688931 31.07545
D-ZF10 CDGM 1.68893 31.077677
PBM28 Ohara 1.68893 31.082901
PBM28W Ohara 1.68893 31.082901
D-ZF10-25 CDGM 1.68731 31.183804
FD8 Hoya 1.688931 31.158857
E-FD8 Hoya 1.68893 31.16
MP-FD80 Hoya 1.68893 31.16
MC-FD80 Hoya 1.68893 31.16
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-CD300 Sumita 1.6922 29.6
K-SFLD8 Sumita 1.68893 31.1
SF8 Sumita 1.68893 31.2
K-SFLD8W Sumita 1.6891 31.2
SF15 Sumita 1.69895 30.0
SF5 Sumita 1.6727 32.2
CD45 Sumita 1.6932 33.7
K-CD45 Sumita 1.6932 33.7
K-CD120(M) Sumita 1.71466 29.6
SF19 Sumita 1.6668 33.1
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