PVDF (Polyvinylidene Fluoride) is a high-purity fluoropolymer with excellent mechanical strength and chemical resistance, especially against chlorides, fluorides, and strong acids. Its low leach-out properties make it ideal for equipment requiring high-purity environments.

PVDF screws can be used long-term from -40°C to +150°C, maintaining both strength and chemical resistance within this range.

PVDF has extremely low leaching and ultra-high purity, resists chloride corrosion, and prevents biofouling. Even in ultrapure water, strong acids, or alkaline solutions, PVDF screws maintain water quality and chemical purity. Widely applied in RO desalination systems, semiconductor ultrapure water pipelines, and seawater desalination equipment.

PVDF can resist low concentrations of hydrofluoric acid (HF ≤1%) and shows good stability against LiPF₆ decomposition products and most electrolyte components, making it suitable for electrode coating, drying rooms, and electrolyte filling equipment.

Thanks to their chemical resistance, corrosion resistance, and mechanical strength, PVDF screws are widely used in chemical processing, pharmaceutical manufacturing, and electronic production equipment, especially where contact with aggressive chemicals is involved.

PVDF has outstanding UV and weather resistance, making it suitable for long-term outdoor use with minimal color or performance degradation.

PVDF screws perform well in medium-pressure and sealed environments. However, for high-pressure structural applications, reinforcement with metal support or the use of a higher-rigidity polymer is recommended.

PVDF screws are lighter than metal screws, reducing overall equipment weight and improving handling. Their toughness absorbs vibration, reduces fatigue damage, and their corrosion resistance ensures longer service life and enhanced vibration resistance.

Since PVDF has lower toughness than PEEK, avoid over-tightening. At very low temperatures (around -40°C), PVDF may become brittle — handle carefully to prevent impact damage.

• PVDF: Higher strength, better dimensional stability, harder surface after machining, less prone to deformation.
• PTFE: Wider temperature range and higher chemical inertness.

PVDF screws are better suited for applications requiring both strength and corrosion resistance with low contamination and high purity.