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MPET films are constructed with 1.9um–12um polyester plain film. The standard width is 620 mm.
A high vacuum is employed by a coating machine to melt, evaporate, and deposit high-purity zinc and aluminum on the base film. A metalized polypropylene film is then produced on the surface after an exceedingly thin metal layer has been formed.
The metalized film has a self-healing capability that enables it to return naturally to the electrical performance phenomenon prior to the breakdown after the partial breakdown of the film dielectric. To prevent metal from evaporating and to form the blank insulating strip known as the margin, the metalized film is covered on one or both sides of the edge or in the center. The margin's width is referred to as the margin in the following sentences.
Base film | Polyester film |
Normal thickness | 4.8μm ~12.0μm |
Margin type | middle |
Coating metal | Aluminum |
Coating side | double |
Edge structure | No Heavy edge |
Width(mm) | Margin(mm) | Width(mm) | Margin(mm) |
14 | 3.0 | 38 | 3.0 |
18 | 3.0 | 42 | 3.0/4.0 |
20 | 2.0/3.0 | 52 | 3.0/4.0 |
Square resistance | Tolerance |
1.5Ω/□ | ±30% |
2.0Ω/□ | ±30% |
2.5Ω/□ | ±30% |
3.0Ω/□ | ±30% |
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 | ±25mm ±20mm |
Note: A pair tolerance of outside core diameter ≤2mm. | |||
Properties | Unit | Typical value | ||
Density | g/cm3 | 1.4 | ||
Thickness | µm | ＜5 | 5～12 | ≥12 |
Tensile Strength | MD (MPa) | ≥84 | ≥108 | ≥120 |
Elongation at Break | MD (%) | ≥22 | ≥33 | ≥44 |
Elastic Modulus | MD (MPa) | 3500 | ||
Break-down Voltage | V/µm | ≥200 ( 23°C, DC ) | ≥250 ( 23°C, DC ) | |
Heat Shrinkage | MD (%) | ≤2.5 ( 150°C, 10min) | ||
Surface Roughness | µm | 0.095 | ||
Melting Point | ℃ | 256 | ||
Volume Resistivity | Ω.m | ＞1015 ( 23°C, Humidity 50%) | ||
Dielectric Constant | 3.2 (20℃，1KHz) | |||
Dissipation Factor | - | ≤60×10-4 (20℃，1KHz ) | ||
RC | ΩF | ≥1×104 | ||
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.
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