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CCyclic Olefin Copolymer （COC）
Cyclic‑olefin copolymer (COC) features the primary advantages of high operating temperature, excellent transmittance, low birefringence and low water‑absorption rate.
The material properties of our aspheric terahertz f‑θ lens are described as follows:
| Density | 1.01 g/cc |
| Water absorption，% (ISO 62) | <0.01 |
| Water vapor permeability (23 ° C 85% RH，DIN 53122） | 0.025g*mm/(m2*24h) |
| Tensile strength | 63MPa |
| Tensile modulus | 2600MPa |
| Elongation at yield | 4.50% |
| Heat deflection temperature HDT/B (0.45 MPa) | 75℃ |
| Glass‑transition temperature | 78℃ |
| Melting temperature | 190-250℃ |
| Refractive index | 1.53 |
Fig. 18. Transmittance of a 2 mm thick COC window.