S-TIM27 by Ohara
Standard
Common
Environmentally Friendly
S-TIM27 by Ohara is a standard optical glass with a common melt frequency. It transmits from 0.36 to 2.40 µm with an nd of 1.639799 and a Vd of 34.466422. It has medium thermal expansion (CTE of 8.0×10⁻⁶/K), good chemical resistance, and low relative cost.
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
| Refractive Index (nd) | 1.639799 |
|---|---|
| Abbe Number (Vd) | 34.466422 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.404656 — 2.32542 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.4168\,\lambda^2}{\lambda^2 - 0.0100732} + \frac{0.196785\,\lambda^2}{\lambda^2 - 0.0537617} + \frac{1.68001\,\lambda^2}{\lambda^2 - 164.672}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.0 |
|---|---|
| TCE 100/300°C (10-6/K) | — |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.02 \times 10^{-6} + 2(1.14 \times 10^{-8})\,\Delta T + 3(-3.41 \times 10^{-11})\,\Delta T^2 + \frac{7.97 \times 10^{-7} + 2(1.01 \times 10^{-9})\,\Delta T}{\lambda - 0.269}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | 1 |
Notes
Recommended
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| H-F51 | CDGM | 1.6398 | 34.46457 | |
| FD7 | Hoya | 1.639803 | 34.568909 | |
| E-FD7 | Hoya | 1.6398 | 34.57 | |
| SF7 | Sumita | 1.6398 | 34.6 | |
| SF16 | Schott | 1.646112 | 34.049815 | |
| C37-35 | Corning | 1.636493 | 35.322642 | |
| F6 | Hoya | 1.636356 | 35.340304 | |
| F6 | Schott | 1.636359 | 35.341176 | |
| F7 | CDGM | 1.636365 | 35.386204 | |
| F6 | Sumita | 1.63636 | 35.4 |
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| PBM27 | Ohara | 1.639799 | 34.477127 | |
| PBM6 | Ohara | 1.636358 | 35.376536 | |
| S-TIM6 | Ohara | 1.636358 | 35.391923 | |
| PBM22 | Ohara | 1.647689 | 33.802937 | |
| S-TIM22 | Ohara | 1.647689 | 33.792803 | |
| S-TIM1 | Ohara | 1.625882 | 35.699614 | |
| PBM1 | Ohara | 1.625882 | 35.700668 | |
| PBM11 | Ohara | 1.620955 | 35.880852 | |
| TIM11 | Ohara | 1.620955 | 35.880852 | |
| PBM2 | Ohara | 1.620041 | 36.256658 |