The treated foil is pink or black electrolytic copper foil of very low surface roughness. Compared with regular electrolytic copper foil, this VLP foil has finer crystals, which are equiaxed ones with flat ridges, have a surface roughness of 0.55μm, and have such merits as better size stability and higher hardness. This product is applicable to high-frequency and high-speed materials, mainly flexible circuit boards, high-frequency circuit boards, and ultra-fine circuit boards.
Typical Properties of Very Low Profile Copper Foil
| Classification | Unit | Requirement | Test Method | |||||
| Nominal thickness | um | 12 | 18 | 35 | 50 | 70 | IPC-4562A | |
| Area Weight | g/m² | 107±5 | 153±7 | 285± 10 | 435±15 | 585± 20 | IPC-TM-650 2.2.12.2 | |
| Purity | % | ≥99.8 | IPC-TM-650 2.3.15 | |||||
| Roughness | Shiny side (Ra) | սm | ≤0.43 | IPC-TM-650 2.3.17 | ||||
| Matte side(Rz) | um | ≤3.0 | ≤3.0 | ≤3.0 | ≤3.0 | ≤3.0 | ||
| Tensile Strength | R.T.(23°C) | Mpa | ≥300 | IPC-TM-650 2.4.18 | ||||
| H.T.(180°C) | ≥180 | |||||||
| Elongation | R.T.(23°C) | % | ≥5 | ≥6 | ≥8 | ≥10 | ≥10 | IPC-TM-650 2.4.18 |
| H.T.(180°C | ≥6 | ≥6 | ≥6 | ≥6 | ≥6 | |||
| Peel Strength(FR-4) | N/mm | ≥0.8 | ≥0.8 | ≥1.0 | ≥1.2 | ≥1.4 | IPC-TM-650 2.4.8 | |
| lbs/in | ≥4.6 | ≥4.6 | ≥5.7 | ≥6.8 | ≥8.0 | |||
| Pinholes & Porosity | Numbers | No | IPC-TM-650 2.1.2 | |||||
| Anti-oxidization | R.T.(23°C) | Days | 180 | / | ||||
| H.T.(200°C) | Minutes | 30 | / | |||||
