Polyester film water absorption is the percentage mass increase of a PET specimen after controlled water exposure. This TDS covers bare, treated, coated, and adhesive-backed PET constructions. Interpret results with thickness, conditioning, water temperature, exposure duration, and construction. Reference data can screen materials, but confirm the actual grade and finished structure by representative testing.
Protective film for painted sheet goods should be selected around the full processing route, not from film thickness or initial tack alone. Pre-painted steel, coated aluminum, PCM/VCM panels, roofing sheet, cladding and other finished metal can be exposed to scratches, trapped particles, edge lifting, wrinkles, adhesive transfer and visible surface marking during slitting, punching, bending, roll forming, stamping, storage and shipment. A reliable approval plan starts with the actual coating and finish, then checks application conditions, deformation severity, dwell time and removal stage. Sample testing and a production-representative trial are recommended before full use.
PET film puncture resistance describes how a defined PET or PET-based construction responds to localized penetration. This technical data compares puncture force, penetration distance, energy, and failure behavior for bare, treated, coated, and adhesive-backed PET films. Results support grade or lot comparison only when the tested structure, probe setup, and conditions are identified. Sample testing remains necessary before full use.
PET film chemical resistance describes how an uncoated polyester carrier or a complete coated, adhesive-backed or laminated construction responds to controlled contact with acids, alkalis, solvents, cleaners and process fluids. This technical reference connects film structure, exposure conditions, mechanical and optical checks, peel behaviour and failure observations. Published data can support initial screening, but the supplied grade, actual chemical formulation, protected surface and intended dwell condition should be confirmed by sample testing. Chemical exposure data should not be treated as a penetration limit; evaluate localized loading separately with the PET film puncture resistance technical data.
