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. The same city also uses sheet resistance to denote the thickness of the metal layer and is used to describe the resistance of the metal layer on the metalized film in the unit square area. According to customer requirements, safety films can be made in a variety of parameters.
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 |
Diamond Pattern | T-Pattern | 1/2 T-Pattern | |
Width (mm) | Width (mm) | Width (mm) | Width (mm) |
25 | 60 | 30 | 37.5 |
30 | 75 | 37.5 | |
35 | 85 | 50 | |
37.5 | 90 | 75 | |
40 | 100 | ||
45 | 120 | ||
50 |
Reinforced resistance | Normal resistance |
(2~4)Ω/□ | (6~9)Ω/□ |
(1~3)Ω/□ | (4~6)Ω/□ |
(1~3)Ω/□ | (12~18)Ω/□ |
(2~4)Ω/□ | (17~23)Ω/□ |
Note: If a customer needs other resistance, film width, or margin, please contact us.
Inside core diameter/Tolerance | Outside core diameter/Tolerance | ||
75mm | +1/-0.5mm | 175 220 280 320 | ±25mm ±20mm ±20mm ±20mm |
Note: A pair tolerance of outside core diameter ≤2mm. |
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 |
Film rolls are packed in plastic bags, vacuumed and put into desiccant for heat sealing.
The Bags are marked with type labels, mark thickness width, free margin width and resistance.
The bags are packed in carton cases.
The cartons are wrapped by wooden cases or reinforced carton.
We've got the high-quality capacitors, contact us now!