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PET release film, also known as silicone-coated PET film, is typically made of a PET base film that is coated with a layer of silicone on one or both sides. The silicone coating makes the film non-sticky and allows it to release easily from an adhesive or a sticky substrate.

PET protective film, on the other hand, is made of a plain PET film or a PET film that is coated with a layer of an acrylic or rubber-based adhesive. The adhesive layer is designed to stick to a surface and protect it from scratches, dust, and other damages.

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PET release film has several unique properties that make it ideal for use in a variety of industries. It is heat resistant, chemical resistant, and has excellent release properties, thanks to the silicone coating. It also has a smooth surface that allows for high-resolution printing, making it suitable for use as a masking tape, label, or transfer film.

PET protective film is designed to provide temporary or long-term protection to surfaces such as electronics, glass, metal, and plastics. It is highly resistant to scratches, tears, and punctures, and can withstand exposure to various environmental conditions, such as moisture, heat, and UV light. It also comes in different colors and finishes, such as clear, matte, or glossy, to suit different application requirements.

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PET release film is commonly used in the adhesive tape industry, the label industry, and the screen printing industry. It is used as a release liner for pressure-sensitive adhesive tapes, as a masking tape for painting and coating, and as a transfer film for graphics and decals.