Single Margin Zn-Al MPP Film (Ramp Resistance)
A coating machine uses a high vacuum to melt, evaporate, and deposit high-purity zinc and aluminum on the base film. After an incredibly thin metal layer has been created, a metalized polypropylene film is created on the surface.
After the partial breakdown of the film dielectric, the metalized film has a self-healing function that causes it to naturally revert to the electrical performance phenomenon before the breakdown. The metalized film is covered on one or both sides of the edge or in the center to create a blank insulating strip without evaporating metal, known as the margin, and its width is referred to as the margin in the actual fabrication of capacitors.
Basic Specification
| Base film | Polypropylene film |
| Normal thickness | 2.0μm ~12.0μm |
| Margin type | Single |
| Coating metal | Aluminum or Zinc-Aluminum alloy |
| Coating side | Single |
| Edge structure | Heavy edge |
Square Resistance
| Reinforced resistance | Normal resistance |
| (2～4)Ω/□ | (6～25)Ω/□ |
| (2～4)Ω/□ | (6～20)Ω/□ |
| (2～4)Ω/□ | (6～30)Ω/□ |
| (1～3)Ω/□ | (4～26)Ω/□ |
Normal film Width and Margin
| Width (mm) | Margin (mm) | Width (mm) | Margin (mm) |
| 45 | 2.5 | 70 | 2.5 |
| 50 | 2.0/2.5 | 75 | 2.0/2.5 |
| 55 | 2.0/2.5 | 80 | 2.0/2.5 |
| 60 | 2.0/2.5 | 85 | 2.0/2.5 |
| 62.5 | 4 | 100 | 2.0/2.5 |
| 65 | 2.5 | 125 | 2.0 |
Note: If you need other resistance, film width or margin, please send us information, thank you.
Inside/Outside Core Diameter
| Inside core diameter | Tolerance | Outside core diamete | Tolerance |
| 75mm | +1/-0.5mm | 220mm | ±20mm |
| 75mm | +1/-0.5mm | 280mm | ±20mm |
| 75mm | +1/-0.5mm | 320mm | ±20mm |
Note: A pair tolerance of outside core diameter ≤2mm
Specifications of Metallized Polypropylene Film
| Properties | Unit | Typical value |
| Density | g/cm3 | 0.905±0.005 |
| Thickness | µm | 2.0 ～ 12 |
| Tensile Strength | MD (MPa) | ≥100 |
| Elongation at Break | MD (%) | 20～200 |
| Elastic Modulus | MD (MPa) | 2800 |
| Heat Shrinkage | MD (%) | ≤5 ( 120°C, 10min) |
| Wetting Tension | mN/m | 38 (Corona treated side) |
| Surface Roughness | µm | 0.08 |
| Melting Point | ℃ | 172 |
| Volume Resistivity | Ω.m | ＞1015 |
| Break-down Voltage | V/µm | ≥350 ( 23°C, DC ) |
| Dielectric Constant | 2.2 (20℃，1KHz) | |
| Dissipation Factor | ≤4×10-4 (20℃，1KHz ) | |
| RC | ΩF | ≥5×104 |