H-ZK4 by CDGM

Standard Rare Environmentally Friendly

H-ZK4 by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.30 to 2.40 µm with an nd of 1.60881 and a Vd of 58.855991. It has low thermal expansion (CTE of 6.3×10⁻⁶/K), good chemical resistance, and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.302–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.302–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–2.400 µm
Optical Properties
Refractive Index (nd) 1.60881
Abbe Number (Vd) 58.855991
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.805863\,\lambda^2}{\lambda^2 - 0.0036534} + \frac{0.740367\,\lambda^2}{\lambda^2 - 0.0162979} + \frac{0.904055\,\lambda^2}{\lambda^2 - 95.9876}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.3
TCE 100/300°C (10-6/K) 7.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.08 \times 10^{-7} + 2(1.68 \times 10^{-8})\,\Delta T + 3(-3.77 \times 10^{-11})\,\Delta T^2 + \frac{4.83 \times 10^{-7} + 2(4.1 \times 10^{-10})\,\Delta T}{\lambda - 0.162}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.53
Relative Cost 3.3
Mechanical Properties
Young's Modulus (GPa) 81.12
Poisson's Ratio 0.265
Knoop Hardness (kgf/mm²) 516.0
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BACD3 Hoya 1.608812 58.863994
SK3 Sumita 1.60881 58.9
SK3 Schott 1.60881 58.921505
C09-59 Corning 1.608756 59.036803
K-PSK200(M) Sumita 1.61083 58.9
BSM4 Ohara 1.612716 58.749129
S-BSM4 Ohara 1.612716 58.716945
BSM7 Ohara 1.607291 59.375631
N-SK4 Schott 1.61272 58.63
SK4 Schott 1.61272 58.629829
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-ZK6 CDGM 1.61272 58.577083
D-ZK79 CDGM 1.60886 57.895896
D-ZK79-25 CDGM 1.60809 57.820851
H-ZK7A CDGM 1.61309 60.355862
H-ZK7 CDGM 1.613095 60.614383
H-ZK14 CDGM 1.60311 60.603787
H-ZK21 CDGM 1.62299 58.120667
D-ZK21-25 CDGM 1.62346 58.115078
H-ZK9B CDGM 1.62041 60.339343
H-TK9 CDGM 1.62075 60.299778
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