H-K12 by CDGM

Standard Rare Environmentally Friendly

H-K12 by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.32 to 2.40 µm with an nd of 1.533589 and a Vd of 55.469983. It has medium thermal expansion (CTE of 9.2×10⁻⁶/K) and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–1.014 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–1.014 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.320–2.400 µm
Optical Properties
Refractive Index (nd) 1.533589
Abbe Number (Vd) 55.469983
Dispersion Formula Schott
Wavelength Range 0.365 — 1.014 µm
$$n(\lambda) = \sqrt{2.31506 - 0.00827156\,\lambda^2 + 0.0129536\,\lambda^{-2} + 0.000268505\,\lambda^{-4} - 5.46028 \times 10^{-6}\,\lambda^{-6} + 6.24326 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.2
TCE 100/300°C (10-6/K) 10.7
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.57 \times 10^{-6} + 2(1.35 \times 10^{-8})\,\Delta T + 3(-5.16 \times 10^{-11})\,\Delta T^2 + \frac{7.91 \times 10^{-7} + 2(9.19 \times 10^{-10})\,\Delta T}{\lambda - 0.086}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.72
Relative Cost 4.7
Mechanical Properties
Young's Modulus (GPa) 70.3
Poisson's Ratio 0.234
Knoop Hardness (kgf/mm²) 462.0
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
IRG15 Generic IR 1.534275 55.700357
D263TECO Schott 1.523303 54.5172
K5G20 Schott 1.52344 56.76
ZK1 Schott 1.533149 57.980912
ZNC1 Hoya 1.533149 58.063515
N-BALF5 Schott 1.54739 53.63
BALF5 Schott 1.547391 53.629486
BALF5 Sumita 1.54739 53.6
BAL5 Ohara 1.547393 53.550738
NSL33 Ohara 1.514536 54.714595
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-K8 CDGM 1.51602 56.794825
H-K51 CDGM 1.52307 58.639792
H-KF6 CDGM 1.51742 52.149249
H-K10 CDGM 1.51818 58.949331
H-K50 CDGM 1.52249 59.480754
H-BAK2 CDGM 1.53996 59.724182
H-BAK5 CDGM 1.56069 58.344731
H-K11 CDGM 1.52638 60.15737
H-BAK7GT CDGM 1.56883 56.041308
H-BAK7 CDGM 1.56883 56.041308
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