C55-40 by Corning

Standard Unknown Environmentally Friendly

C55-40 by Corning is a standard optical glass. It transmits from 0.31 to 1.80 µm with an nd of 1.6555 and a Vd of 40.115717. It has low thermal expansion (CTE of 5.5×10⁻⁶/K).

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.31–1.8 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.31–1.8 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–1.800 µm
Optical Properties
Refractive Index (nd) 1.6555
Abbe Number (Vd) 40.115717
Dispersion Formula Schott
Wavelength Range 0.31 — 1.8 µm
$$n(\lambda) = \sqrt{2.67472 - 0.0140532\,\lambda^2 + 0.0227068\,\lambda^{-2} + 0.000553716\,\lambda^{-4} + 1.21796 \times 10^{-5}\,\lambda^{-6} + 1.43229 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.5
TCE 100/300°C (10-6/K) 5.8
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) 3.57
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
N-KZFS5 Schott 1.65412 39.7
BPH5 Ohara 1.654115 39.687638
S-NBH5 Ohara 1.654115 39.682794
KZFSN5 Schott 1.65412 39.63
ADF50 Hoya 1.654118 39.624202
E-ADF50 Hoya 1.65412 39.62
H-TF5 CDGM 1.6541 39.539424
NBFD38 Hoya 1.65253 39.48
BAH30 Ohara 1.650158 39.390461
BAFD10 Hoya 1.650157 39.343065
Similar Glasses (Corning)
Glass Manufacturer nd Vd Compare
C51-39 Corning 1.650206 39.193419
C38-42 Corning 1.637752 42.433862
C37-35 Corning 1.636493 35.322642
C26-36 Corning 1.625903 35.60701
C20-36 Corning 1.62001 36.30126
C48-46 Corning 1.647747 46.227993
C48-34 Corning 1.647992 33.943274
D01-41 Corning 1.701805 41.110216
C97-36 Corning 1.695989 36.517325
C16-44 Corning 1.616002 44.416477
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