Ferronickel Invar Foil for FMM Production
Invar Foil
Ferronickel (Fe-Ni) Invar Foil is the best choice for making Fine Metal Mask (FMM), which is a key consumable part in evaporation process in OLED-FPD industry, owing to its low Coefficient of thermal expansion. We can supply annealed ultra-thin invar foil with a thickness of 25μm, 30μm, 40μm, which can be used for OLED-FPD, Semiconductor integrated circuit industries.
1. Chemistry (mass%) of Invar Foil
| Chemistry | C | Si | Mn | P | S | Ni | Fe |
| Spec | Max | Max | Max | Max | Max | ||
| Invar36 | 0.02 | 0.3 | 0.5 | 0.03 | 0.03 | 36±0.5 | Bal. |
| Invar42 | 0.02 | 0.3 | 0.5 | 0.03 | 0.03 | 41±1 | Bal. |
Blew data is based on Invar36 foil...
2. Coefficient of thermal expansion
Avg. CTE ≤16*10-7/℃,at a temperature range of 30 to 300℃.
3. Dimension & tolerance of our Invar Foil
| Item | Tolerance |
| Thickness | ±5% |
| Width | ±1.5mm |
| Radius of curvature | ≤1.0/1000mml |
4. Hardness of Invar Foil
Hardness 180~260Hv, based on JIS Z2244
5. Surface finish/roughness of our Invar Foil
≤Ra 0.05μm
6. Annealed, Tension free Invar Foil
Half-etching test passed
7. Appearance of Invar Foil
Flatness test on a marble table, and check the appearance.
