Baoli Packaging has developed a series of hydrophilic film materials, widely used in the production of biosensor test strips based on colorimetric, amperometric, and potentiometric methods. The product is a polyester film that undergoes anti-static pretreatment on both sides followed by hydrophilic treatment. A hydrophilic treatment layer is coated on either one or both sides of transparent or white polyester film, featuring an extremely low contact angle (7-8°) to prevent liquid movement. Our specialized coating significantly enhances the absorption of biological fluids along capillary channels toward the test strip reaction zone, ensuring rapid and uniform sample flow through the reaction area.