D-PK3 by CDGM

Standard Rare Precision Molding Environmentally Friendly

D-PK3 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 1.525 and a Vd of 70.370578. It has medium thermal expansion (CTE of 8.1×10⁻⁶/K), good chemical resistance, very high relative cost, and precision molding compatibility.

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) 1.525
Abbe Number (Vd) 70.370578
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.631689\,\lambda^2}{\lambda^2 - 0.0127792} + \frac{0.666896\,\lambda^2}{\lambda^2 - 0.00313928} + \frac{0.874645\,\lambda^2}{\lambda^2 - 90.1741}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.1
TCE 100/300°C (10-6/K) 9.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-3.49 \times 10^{-6} + 2(1.52 \times 10^{-8})\,\Delta T + 3(-7.04 \times 10^{-11})\,\Delta T^2 + \frac{4.13 \times 10^{-7} + 2(3.57 \times 10^{-10})\,\Delta T}{\lambda - 0.131}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.65
Relative Cost 25.5
Mechanical Properties
Young's Modulus (GPa) 70.71
Poisson's Ratio 0.235
Knoop Hardness (kgf/mm²) 447.0
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Notes

anneal rate:4℃/h

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
K-PMK30 Sumita 1.525 70.4
K-PMK30(M) Sumita 1.52002 70.2
PK50 Schott 1.52054 69.712402
PCS1 Hoya 1.517284 69.67869
APL1 Ohara 1.517277 69.563209
S-APL1 Ohara 1.517277 69.563209
S-APL Ohara 1.517277 69.56319
K-PG325 Sumita 1.5067 70.5
QUARTZ Generic Birefringent 1.544296 70.132045
K-PG325(M) Sumita 1.50506 70.4
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
D-PK3-25 CDGM 1.52368 70.274839
H-QK3LGTI CDGM 1.48749 70.440487
H-QK3L CDGM 1.48749 70.440487
D-QK3L CDGM 1.48749 70.440487
D-QK3L-25 CDGM 1.48687 70.417086
H-K2 CDGM 1.50047 66.020774
H-QK30GTI CDGM 1.48217 70.299764
H-FK55 CDGM 1.5502 75.224681
D-ZPK7-25 CDGM 1.56854 71.235367
H-ZPK7 CDGM 1.56907 71.304254
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