H-K9LAGT by CDGM

Standard Very Common Environmentally Friendly

H-K9LAGT by CDGM is a standard optical glass with a very common melt frequency. It transmits from 0.28 to 2.40 µm with an nd of 1.5168 and a Vd of 64.198695. It has medium thermal expansion (CTE of 7.2×10⁻⁶/K), excellent chemical resistance, and low 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: 0.280–2.400 µm
Optical Properties
Refractive Index (nd) 1.5168
Abbe Number (Vd) 64.198695
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.684743\,\lambda^2}{\lambda^2 - 0.0031354} + \frac{0.586772\,\lambda^2}{\lambda^2 - 0.0148101} + \frac{1.14804\,\lambda^2}{\lambda^2 - 116.584}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.2
TCE 100/300°C (10-6/K) 8.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[9.03 \times 10^{-7} + 2(1.85 \times 10^{-8})\,\Delta T + 3(-2.98 \times 10^{-11})\,\Delta T^2 + \frac{4.55 \times 10^{-7} + 2(1 \times 10^{-10})\,\Delta T}{\lambda - 0.182}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.51
Relative Cost 2.0
Mechanical Properties
Young's Modulus (GPa) 81.45
Poisson's Ratio 0.209
Knoop Hardness (kgf/mm²) 537.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BSC7 Hoya 1.5168 64.2
B16-64 Corning 1.516804 64.224234
N-BK7 Schott 1.5168 64.17
N-BK7HT Schott 1.5168 64.17
N-BK7HTi Schott 1.5168 64.17
N-BK7HTSultra Schott 1.5168 64.17
BK7 Schott 1.5168 64.167336
BSL7Y Ohara 1.51633 64.243778
BSL7 Ohara 1.51633 64.150145
BK7HT Schott 1.51633 64.14348
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-K9LA CDGM 1.5168 64.198695
H-K9L CDGM 1.5168 64.198732
H-K9LGT CDGM 1.5168 64.198732
H-K9L* CDGM 1.5168 64.198732
D-K9 CDGM 1.51633 64.058952
D-K9GT CDGM 1.51633 64.058952
D-K9GT-25 CDGM 1.51577 63.989637
D-K9-25 CDGM 1.51577 63.989637
D-K59 CDGM 1.5176 63.499991
D-K59-25 CDGM 1.51698 63.4085
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