These 50 μm thickness, non-sterile polyester sealing films minimize evaporation, prevent spillage and contamination between wells, and provide a secure seal, not just a cover. Secure sealing of all wells eliminates "edge effects" in sensitive ELISA assays. Thay are non-pierceable and measures 79.4 x 146.1 mm. The functional temperature range is from -40 °C to +120 °C.