Single Margin Zn-Al MPP Film (High Resistance)
In a high vacuum condition, a coating machine melts, evaporates, and deposits high-purity zinc and aluminum on the base film. Following the formation of an incredibly thin metal layer, a metalized polypropylene film is created on the surface.
The metalized film has a self-healing function, and it naturally reverts to the electrical performance characteristic prior to the breakdown right after the partial breakdown of the film dielectric. 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, which is known as the margin. The margin’s width is also known as the margin.
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/□ | (30～555)Ω/□ |
| (2～4)Ω/□ | (40～65)Ω/□ |
| (1～3)Ω/□ | (50～80)Ω/□ |
| (2～4)Ω/□ | (70～100)Ω/□ |
| (2～4)Ω/□ | (90～120)Ω/□ |
Normal film Width and Margin
| Width (mm) | Margin (mm) | Width (mm) | Margin (mm) |
| 37.5 | 2.0/2.5 | 90 | 2.0/2.5 |
| 50 | 2.0/2.5 | 95 | 2.0 |
| 55 | 2.0/2.5 | 100 | 2.5 |
| 60 | 2.0/2.5 | 110 | 2.5 |
| 67.5 | 2.0 | 115 | 2.5 |
| 75 | 2.0/2.5 |
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 |