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PVDF (Polyvinylidene Fluoride)

Polyvinylidene Fluoride (PVDF) is a semi-crystalline, highly inert, tough, and dimensionally stable fluoropolymer thermoplastic. It typically features a molecular weight in the range of 400,000–600,000, a crystallinity of approximately 60–80%, and a fluorine content of about 59% by weight. PVDF can be continuously used in a temperature range from -50°C to +150°C.

PVDF exhibits a melting temperature between 170°C and 185°C and undergoes significant thermal decomposition at approximately 350–380°C, releasing hydrogen fluoride (HF). Due to the relatively wide processing window between melting and decomposition, PVDF is well-suited for conventional thermoplastic processing methods such as injection molding and extrusion, typically performed at melt temperatures of 200–250°C.

PVDF is considered one of the most radiation-resistant thermoplastics available, though it is generally ranked below high-performance polymers such as Polyether ether ketone. It combines the chemical resistance typical of fluoropolymers with the processability of conventional thermoplastics. PVDF demonstrates excellent resistance to chemicals, oxidation, weathering, and radiation exposure. Additionally, it exhibits functional properties such as piezoelectricity, dielectric behavior, and pyroelectric response.

PVDF shows strong resistance to a wide range of chemicals, including organic acids, aliphatic and aromatic hydrocarbons, alcohols, and halogenated solvents. However, it has limited resistance to strong bases and certain ketones, especially under elevated temperatures.