S-TIH20 by Ohara

Obsolete Unknown Environmentally Friendly

S-TIH20 by Ohara is an obsolete optical glass. It transmits from 0.36 to 2.40 µm with an nd of 1.70585 and a Vd of 30.244176. It has medium thermal expansion (CTE of 8.1×10⁻⁶/K) and excellent 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: 0.360–2.400 µm
Optical Properties
Refractive Index (nd) 1.70585
Abbe Number (Vd) 30.244176
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{1 + \frac{1.59255\,\lambda^2}{\lambda^2 - 0.011942} + \frac{0.218806\,\lambda^2}{\lambda^2 - 0.059277} + \frac{1.60254\,\lambda^2}{\lambda^2 - 143.962}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.1
TCE 100/300°C (10-6/K) 9.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.98
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
N-SF64 Schott 1.70591 30.23
SF64A Schott 1.70585 30.299703
C99-30 Corning 1.699002 30.107427
N-SF15 Schott 1.69892 30.2
SF15 Schott 1.69895 30.07
ZF11 CDGM 1.698949 30.065686
E-FD15L Hoya 1.69895 30.05
E-FD15 Hoya 1.69895 30.05
FD15 Hoya 1.698945 30.050548
H-ZF11 CDGM 1.69894 30.05045
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
S-TIM35 Ohara 1.698947 30.127865
PBM35 Ohara 1.698947 30.121211
L-TIM28P Ohara 1.694529 30.655992
S-TIH1 Ohara 1.717362 29.518091
PBH1 Ohara 1.717362 29.513538
PBH18 Ohara 1.721506 29.243262
S-TIH18 Ohara 1.721507 29.23233
L-TIM28 Ohara 1.689479 31.023399
S-TIM28 Ohara 1.688931 31.07545
PBM28W Ohara 1.68893 31.082901
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