S-PHM51 by Ohara

Obsolete Unknown Environmentally Friendly

S-PHM51 by Ohara is an obsolete optical glass. It transmits from 0.31 to 0.90 µm with an nd of 1.617001 and a Vd of 62.800809. It has medium thermal expansion (CTE of 9.7×10⁻⁶/K) and below average chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–0.900 µm
Optical Properties
Refractive Index (nd) 1.617001
Abbe Number (Vd) 62.800809
Dispersion Formula Schott
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{2.5759 - 0.0105535\,\lambda^2 + 0.0138959\,\lambda^{-2} + 0.000264983\,\lambda^{-4} - 1.96805 \times 10^{-6}\,\lambda^{-6} + 1.099 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.7
TCE 100/300°C (10-6/K) 11.1
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-6.88 \times 10^{-6} + 2(1.5 \times 10^{-8})\,\Delta T + 3(-3.45 \times 10^{-13})\,\Delta T^2 + \frac{8.32 \times 10^{-7} + 2(-2.61 \times 10^{-10})\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.53
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 51
Alkali Resistance —
Phosphate Resistance 4
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
PCD5 Hoya 1.616998 62.827457
N-PSK53A Schott 1.618 63.39
H-ZPK1A CDGM 1.618 63.392702
K-PSKn2 Sumita 1.618 63.4
PCD4 Hoya 1.618 63.4
PSKN2 Sumita 1.618 63.4
ATC1 Hoya 1.62 62.19284
ADC1 Hoya 1.62 62.192825
N-PSK53 Schott 1.62014 63.48
PSK53A Schott 1.620141 63.480444
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
PHM51 Ohara 1.617001 62.800809
S-PHM52Q Ohara 1.617999 63.321449
S-PHM52 Ohara 1.618 63.333504
PHM52 Ohara 1.617999 63.386441
S-BSM16 Ohara 1.620411 60.289582
BSM16 Ohara 1.62041 60.271913
BSM16C Ohara 1.62041 60.254106
BSM14 Ohara 1.603112 60.704896
BSM51Y Ohara 1.603109 60.651225
S-BSM14 Ohara 1.603112 60.64108
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