Polyvinylidene fluoride or PVDF is a highly reactive thermoplastic fluoropolymer, a polymer of vinylidene fluoride.

PVDF is a special plastic from the fluoropolymer family.

A semi-crystalline, semi-opaque and white engineering thermoplastic that is melt processable and very expensive. It has good temperature and general chemical resistance (although neither are as good as PTFE) and good abrasion and radiation resistance. It is slightly stiffer and stronger than most (melt-processable) fluoropolymers, but has high dielectric losses.

It has a highly dipolar molecule, so when the right morphology is achieved, valuable piezoelectric and pyroelectric properties result.

In practice, both uniaxial and biaxial mechanical orientations are used, resulting in a different balance of piezo/pyroelectric properties after poling.

It is commonly used in applications requiring the highest purity, strength and resistance to solvents, acids, bases and heat and low smoke formation in the event of fire. Compared to other fluoropolymers, it has an easier melting process due to its relatively low melting point.