K-SKLD310 by Sumita

Standard Rare Precision Molding Environmentally Friendly

K-SKLD310 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.33 to 2.00 µm with an nd of 1.6042 and a Vd of 48.9. It has low thermal expansion (CTE of 4.8×10⁻⁶/K), excellent 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: 0.330–2.000 µm
Optical Properties
Refractive Index (nd) 1.6042
Abbe Number (Vd) 48.9
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.52567 - 0.0118661\,\lambda^2 + 0.0165107\,\lambda^{-2} + 0.000536901\,\lambda^{-4} - 2.64307 \times 10^{-5}\,\lambda^{-6} + 2.86486 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 4.8
TCE 100/300°C (10-6/K) 7.1
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[8.58 \times 10^{-6} + 2(1.74 \times 10^{-8})\,\Delta T + 3(-7.72 \times 10^{-11})\,\Delta T^2 + \frac{5.67 \times 10^{-7} + 2(3.44 \times 10^{-10})\,\Delta T}{\lambda - 0.221}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.72
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BAM5 Ohara 1.607289 49.188575
BAF5 Hoya 1.607292 49.336899
LAF50 Hoya 1.60199 50.21
C0550 Corning 1.605004 50.419332
C05-50 Corning 1.605004 50.419332
KZFS6 Schott 1.591965 48.509579
SSKN8 Schott 1.61772 49.771451
S-BSM28 Ohara 1.617722 49.815052
N-SSK8 Schott 1.61773 49.83
BSM28 Ohara 1.617722 49.83232
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-SKLD310(M) Sumita 1.60132 49.0
BAF5 Sumita 1.60729 49.3
K-SSK9 Sumita 1.62012 49.8
SSK9 Sumita 1.62012 49.8
SSK3 Sumita 1.61484 51.1
K-SSK3 Sumita 1.61484 51.1
K-BaF8 Sumita 1.62374 47.1
BAF8 Sumita 1.62374 47.1
K-LCV161(M) Sumita 1.61477 45.6
BAF3 Sumita 1.58267 46.5
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