P-LAK35 by Schott

Preferred Unknown Precision Molding Environmentally Friendly

P-LAK35 by Schott is a preferred optical glass. It transmits from 0.30 to 2.50 µm with an nd of 1.6935 and a Vd of 53.2. It has medium thermal expansion (CTE of 8.13×10⁻⁶/K), below average chemical resistance, and precision molding compatibility.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–2.500 µm
Optical Properties
Refractive Index (nd) 1.6935
Abbe Number (Vd) 53.2
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.39324\,\lambda^2}{\lambda^2 - 0.0071596} + \frac{0.418883\,\lambda^2}{\lambda^2 - 0.0233637} + \frac{1.04381\,\lambda^2}{\lambda^2 - 88.3284}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.13
TCE 100/300°C (10-6/K) 9.68
Thermal Conductivity (W/mK) 0.72
Heat Capacity (J/gK) 0.63
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.9 \times 10^{-6} + 2(7.99 \times 10^{-9})\,\Delta T + 3(7.76 \times 10^{-12})\,\Delta T^2 + \frac{5.64 \times 10^{-7} + 2(6.57 \times 10^{-10})\,\Delta T}{\lambda - 0.185}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.848
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) 101.0
Poisson's Ratio 0.29
Knoop Hardness (kgf/mm²) 616.0
Chemical Resistance
Climatic Resistance 2
Stain Resistance 5
Acid Resistance 53
Alkali Resistance 1
Phosphate Resistance 4
Notes

suitable for precision molding

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
MP-LAC130 Hoya 1.6935 53.2
MC-LAC130 Hoya 1.6935 53.2
M-LAC130 Hoya 1.6935 53.2
S-LAL13 Ohara 1.693501 53.205327
L-LAL13 Ohara 1.6935 53.185799
LAL13 Ohara 1.693501 53.231566
D-LAK6 CDGM 1.69384 53.128245
K-VC80 Sumita 1.69384 53.1
LAC13 Hoya 1.6935 53.34
D-LAK6-25 CDGM 1.69281 53.049215
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
LAKN13 Schott 1.693501 53.330054
LAK9 Schott 1.691002 54.708408
N-LAK9 Schott 1.691 54.71
LAK9G15 Schott 1.69064 54.76
N-LAK14 Schott 1.6968 55.41
LAKN14 Schott 1.6968 55.410215
N-LAK8 Schott 1.713 53.83
LAK8 Schott 1.713003 53.831633
LAKL12 Schott 1.6779 54.92
LAKN12 Schott 1.6779 55.199566
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