D56-27 by Corning

Standard Unknown Environmentally Friendly

D56-27 by Corning is a standard optical glass. It transmits from 0.35 to 1.80 µm with an nd of 1.755203 and a Vd of 27.591377. It has medium thermal expansion (CTE of 7.4×10⁻⁶/K).

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.35–1.8 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.35–1.8 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.350–1.800 µm
Optical Properties
Refractive Index (nd) 1.755203
Abbe Number (Vd) 27.591377
Dispersion Formula Schott
Wavelength Range 0.35 — 1.8 µm
$$n(\lambda) = \sqrt{2.96258 - 0.0103247\,\lambda^2 + 0.0359693\,\lambda^{-2} + 0.00238036\,\lambda^{-4} - 0.00016079\,\lambda^{-6} + 2.0877 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.4
TCE 100/300°C (10-6/K) 8.3
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) 4.7
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
SF4 Schott 1.7552 27.58
ZF6 CDGM 1.755205 27.546239
FD4 Hoya 1.755199 27.530242
H-ZF6 CDGM 1.7552 27.530047
E-FD4 Hoya 1.7552 27.53
E-FD4L Hoya 1.7552 27.53
PBH4W Ohara 1.755199 27.512146
PBH4 Ohara 1.755199 27.512146
S-TIH4 Ohara 1.755199 27.512089
K-SFLD4 Sumita 1.7552 27.5
Similar Glasses (Corning)
Glass Manufacturer nd Vd Compare
D62-27 Corning 1.761802 26.90455
D40-28 Corning 1.740001 28.102623
D34-26 Corning 1.73402 26.500794
D28-28 Corning 1.728304 28.397796
D85-26 Corning 1.784994 25.902085
D85-25 Corning 1.784752 25.799504
D17-29 Corning 1.717409 29.492751
E05-25 Corning 1.805093 25.506125
C99-30 Corning 1.699002 30.107427
C89-31 Corning 1.689004 31.210861
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