As a professional polyester film manufacturer, we must know that the characteristics of a polyester film determine its different uses, different uses of the polyester film have different requirements on raw materials and additives, as well as processing technology, thickness, and technical specifications are not the same; in addition, only Bopet has a variety of uses, so the polyester film manufacturer classifies films according to their uses into the following categories:
1. Electrical insulating film. Because of its good electrical, mechanical, thermal, and chemical inertness, good insulation performance, high breakdown voltage, special for electronic and electrical insulating materials, the common standard thicknesses of polyester film manufacturer are 25μm, 36μm, 40μm, 48μm, 50μm, 70μm, 75μm, 80μm, 100μm and 125μm (micron). These include wire and cable insulation film (thickness 25-75μm) and touch switch insulation film (50-75μm).
2. Capacitor film. The polyester film manufacturer applies it to the dielectric and insulation layer of capacitors, which has the characteristics of high tensile strength, high dielectric constant, low loss factor, good thickness uniformity, good electrical properties, and high resistance. The commonly used standard thicknesses are 3.5 μm, 3.8 μm, 4 μm, 4.3 μm, 4.8 μm, 5 μm, 6 μm, 8 μm, 9.8 μm , 10 μm, 12 μm.
3. Card film. It has good transparency, high stiffness, good heat stability, flat surface excellent winding performance, uniform longitudinal, and transverse tensile performance, waterproof, oil and chemical resistance, and other excellent performance. It is specially used for the protective packaging of pictures, certificates, documents, and office supplies, so that it is smooth and beautiful after hot stamping as a protective film, and can keep the original clear and undistorted. The standard thickness is 10.75 μm, 12 μm, 15 μm, 25 μm, 28 μm, 30 μm, 36 μm, 45 μm, 55 μm, 65 μm, 70 μm, and above 15 μm is mainly used as laser anti-counterfeiting base film or high-grade protection film.
4. Universal membranes. Polyester film manufacturers found that it has excellent strength and dimensional stability, cold resistance, and chemical stability, widely used in composite packaging, photographic film, metal evaporation, audio, and video recording, and other substrates.