How to Judge the Quality of Marble Protective Film

Marble Protective Film Qualification Standards

• Observe the Material Texture: High-quality protective film has a uniform texture, a smooth surface free of bubbles, wrinkles, or impurities. It is flexible and resilient to the touch and does not tear easily. Low-quality products may have uneven thickness, frayed edges, break easily when stretched, leave noticeable creases after bending that are difficult to restore, and have a rough texture and lack of toughness.
• Test Adhesion: A good protective film has moderate and uniform adhesion. When first applied, it adheres tightly to the marble surface without partial peeling or warping. It leaves no adhesive residue on the marble when peeled off, and it is not too sticky, making removal difficult. Low-quality films have unstable adhesion. Initially, they may have insufficient adhesion, making them easy to shift, or later, they may become too sticky to be difficult to remove, and may even damage the stone surface.
• Check the Wear Resistance: High-quality films have a tough wear layer. Lightly scraping with a fingernail or repeatedly rubbing with a soft cloth will not cause noticeable scratches or fuzzing. Through simulated daily friction tests, wear-resistant protective films can withstand minor scratches and maintain a pristine surface. Poor-quality films are prone to whitening, cracking, or reduced light transmittance after friction.
• Check the Light Transmission: A good protective film has excellent and uniform light transmittance. When applied to marble, it truly displays the original texture and color of the stone without yellowing, blurring, or discoloration. Inferior films may have poor light transmittance, resulting in a dull, odorless, and uneven color, affecting the aesthetics of the stone.
• Focus on Environmental Performance: High-quality protective films are made of environmentally friendly materials, have no pungent odor, and produce no toxic black smoke when burned. Check for environmental certification marks on the product. Environmentally friendly films will not release harmful substances over long-term use and are harmless to humans and the environment. Inferior films may have a strong chemical odor and may volatilize harmful components over long-term use, affecting indoor environmental safety.