D40-28 by Corning

Standard Unknown Environmentally Friendly

D40-28 by Corning is a standard optical glass. It transmits from 0.36 to 1.80 µm with an nd of 1.740001 and a Vd of 28.102623. It has medium thermal expansion (CTE of 7.0×10⁻⁶/K).

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–1.8 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–1.8 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.360–1.800 µm
Optical Properties
Refractive Index (nd) 1.740001
Abbe Number (Vd) 28.102623
Dispersion Formula Schott
Wavelength Range 0.36 — 1.8 µm
$$n(\lambda) = \sqrt{2.9164 - 0.0109334\,\lambda^2 + 0.0332525\,\lambda^{-2} + 0.00265838\,\lambda^{-4} - 0.000217916\,\lambda^{-6} + 2.33884 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.0
TCE 100/300°C (10-6/K) 7.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.56
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
SF3 Sumita 1.74 28.2
SF3 Schott 1.74 28.2
SF54 Schott 1.7408 28.090813
FD3 Hoya 1.739999 28.245048
ZF5 CDGM 1.739999 28.245048
PBH3 Ohara 1.739998 28.283809
PBH3W Ohara 1.739998 28.287409
H-ZF5 CDGM 1.74 28.295649
S-TIH3 Ohara 1.739998 28.296005
PBH13W Ohara 1.740769 27.793228
Similar Glasses (Corning)
Glass Manufacturer nd Vd Compare
D28-28 Corning 1.728304 28.397796
D34-26 Corning 1.73402 26.500794
D56-27 Corning 1.755203 27.591377
D62-27 Corning 1.761802 26.90455
D17-29 Corning 1.717409 29.492751
C99-30 Corning 1.699002 30.107427
D85-26 Corning 1.784994 25.902085
D85-25 Corning 1.784752 25.799504
C89-31 Corning 1.689004 31.210861
E05-25 Corning 1.805093 25.506125
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