K-PG375 by Sumita

Preferred Medium Precision Molding Environmentally Friendly

K-PG375 by Sumita is a preferred optical glass with a medium melt frequency. It transmits from 0.28 to 2.00 µm with an nd of 1.5425 and a Vd of 62.9. It has high thermal expansion (CTE of 12.9×10⁻⁶/K), average chemical resistance, and precision molding compatibility.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.280–2.000 µm
Optical Properties
Refractive Index (nd) 1.5425
Abbe Number (Vd) 62.9
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.34594 - 0.00773172\,\lambda^2 + 0.0117837\,\lambda^{-2} + 0.000252392\,\lambda^{-4} - 1.23523 \times 10^{-5}\,\lambda^{-6} + 8.75401 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 12.9
TCE 100/300°C (10-6/K) 16.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.51 \times 10^{-5} + 2(1.45 \times 10^{-9})\,\Delta T + 3(-9.02 \times 10^{-11})\,\Delta T^2 + \frac{5.44 \times 10^{-7} + 2(3.99 \times 10^{-10})\,\Delta T}{\lambda - 0.176}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.9
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-BAK3 CDGM 1.54678 62.776077
PCD3 Hoya 1.55232 63.424095
H-BAK4 CDGM 1.55248 63.36549
PSK3 Schott 1.552322 63.456253
N-PSK3 Schott 1.55232 63.46
BK6 Schott 1.531129 62.150728
BSC6 Hoya 1.531128 62.075664
BBO-E Generic Birefringent 1.552518 61.321496
L-PHL2 Ohara 1.5588 62.558541
PC3 Hoya 1.52542 64.619542
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-PG375(M) Sumita 1.53922 62.7
K-PBK60 Sumita 1.5274 62.3
K-PBK60(M) Sumita 1.52483 62.0
K-PBK50 Sumita 1.5225 62.3
SK20 Sumita 1.55963 61.2
K-PSK11(M) Sumita 1.55985 61.0
K-PBK50(M) Sumita 1.52025 62.2
BAK2 Sumita 1.53996 59.7
P-BK40 Sumita 1.5176 63.5
K-PBK40 Sumita 1.5176 63.5
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