M-TAFD305 by Hoya

Preferred Very Common Precision Molding Environmentally Friendly

M-TAFD305 by Hoya is a preferred optical glass with a very common melt frequency. It transmits from 0.34 to 2.50 µm with an nd of 1.85135 and a Vd of 40.1. It has low thermal expansion (CTE of 6.0×10⁻⁶/K), good chemical resistance, and precision molding compatibility.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36501–1.5296 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36501–1.5296 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.340–2.500 µm
Optical Properties
Refractive Index (nd) 1.85135
Abbe Number (Vd) 40.1
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{3.32718 - 0.0134324\,\lambda^2 + 0.033398\,\lambda^{-2} + 0.00100605\,\lambda^{-4} - 2.13691 \times 10^{-5}\,\lambda^{-6} + 3.97256 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.0
TCE 100/300°C (10-6/K) 7.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.25 \times 10^{-6} + 2(1.17 \times 10^{-8})\,\Delta T + 3(-4.51 \times 10^{-11})\,\Delta T^2 + \frac{1.25 \times 10^{-6} + 2(1.27 \times 10^{-9})\,\Delta T}{\lambda - 0.0455}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.25
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 2
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Notes

Glass for molded optics lens

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
D-ZLAF85A-25 CDGM 1.8511 40.055609
D-ZLAF85A CDGM 1.85222 40.10819
L-LAH85V Ohara 1.854 40.378368
L-LAH85 Ohara 1.854 40.393284
D-ZLAF85L-25 CDGM 1.8526 40.534071
K-VC185(M) Sumita 1.84909 40.5
D-ZLAF85LS-25 CDGM 1.85344 40.557917
D-ZLAF85L CDGM 1.8537 40.579411
K-VC185 Sumita 1.85375 40.6
D-ZLAF85LS CDGM 1.8545 40.593546
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
MP-TAFD305 Hoya 1.85135 40.1
MC-TAFD305 Hoya 1.85135 40.1
MC-TAFD315 Hoya 1.85135 40.07
M-TAFD315 Hoya 1.85135 40.07
TAFD34 Hoya 1.85033 42.7
TAFD32 Hoya 1.8707 40.73
TAFD6 Hoya 1.847498 43.033415
TAFD5G Hoya 1.83481 42.72
TAFD5F Hoya 1.83481 42.72
TAFD13 Hoya 1.855396 36.557002
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