The COF of PET film describes resistance when a defined surface starts and continues sliding against another surface. This reference applies to uncoated, coated, treated and PET-based protective film used in unwinding, slitting, laminating and die cutting. Each result must be read with its tested sides, method, load and conditioning history. Equipment compatibility, adhesive behavior and removal performance still require sample testing on the actual material and process.
A plastic film specified for electronics shipping should be approved against the actual contact surface, the role it plays in the ESD packaging system, and the condition expected at final removal. This guide applies to display modules, touch panels, HMI assemblies, printed overlays, coated housings, and other finished electronic products exposed to handling, storage, road, air, or sea transport. The main risks are scratching, trapped contamination, edge lift, film movement, charge generation, adhesive transfer, haze, coating disturbance, and difficult removal after extended dwell. Approval should therefore combine surface identification, packaging review, staged sample testing, transport simulation, and post-removal inspection rather than relying on one datasheet value.
Plastic film for appliance touch controls is used to protect appearance-sensitive interfaces while glass, printed overlays, display windows, decorative panels, and surrounding housings move through manufacturing. The challenge is not simply preventing scratches. A film can introduce a new problem if its adhesion is mismatched, contamination is trapped beneath it, an edge lifts near a cutout, or the temporary layer changes a capacitive touch check. This solution focuses on surface identification, controlled application, sample validation, film-on versus film-off functional checks, planned removal, and failure diagnosis before full production use.