Fluorine Lined Piping for Corrosive Media Transfer

Fluorine lined piping, also known as steel lined fluoroplastic pipes, is designed for the safe and reliable transportation of highly corrosive and high-purity fluids. By combining the mechanical strength of carbon steel or stainless steel with the exceptional chemical resistance of fluoroplastics, these pipelines are widely used in chemical processing, pharmaceuticals, petrochemicals, electroplating, and semiconductor industries.

The inner lining, made from PTFE, PFA, or FEP, forms a continuous chemical barrier that completely isolates corrosive media from the metal shell, ensuring long service life, operational safety, and minimal maintenance costs.

Outstanding Corrosion Resistance

The fluoroplastic lining provides near-universal chemical compatibility. PTFE, PFA, and FEP are resistant to almost all strong acids, strong alkalis, organic solvents, oxidizers, and mixed corrosive media, including aqua regia. This makes fluorine lined piping the preferred solution where conventional metal pipes fail due to corrosion, leakage, or contamination.

Long Service Life with Lower Total Cost

Although the initial investment may be higher than standard pipelines, fluorine lined pipes offer significantly lower lifecycle costs. Their excellent aging resistance, low friction coefficient, and anti-scaling properties drastically reduce maintenance, downtime, and replacement frequency, delivering a higher return on investment over time.

Mechanical Strength Meets Chemical Inertness

The steel outer pipe ensures high pressure resistance, impact strength, and structural stability, while the inner fluoroplastic lining delivers unmatched chemical inertness. This “rigid + flexible” composite structure allows stable operation across a wide range of industrial conditions, from low-temperature fluids to high-temperature cleaning processes.

High Purity and Non-Stick Inner Surface

The ultra-smooth inner surface prevents scaling, crystallization, and residue buildup. With no metal ion leaching and no material dissolution, fluorine lined piping guarantees fluid purity, making it ideal for pharmaceutical processes, food-grade applications, and ultra-pure chemical transfer systems. Cleaning is easy, reducing cross-contamination risks and operating costs.

Flexible Design and Easy Installation

Multiple lining technologies are available, including molding, isostatic pressing, rotational lining, and loose lining, allowing customization for different diameters, pressures, and complex pipe geometries. Standardized flange connections (ANSI, DIN, JIS, etc.) ensure easy installation and seamless integration into existing piping systems.

Typical Applications

• Química y petroquímica: Sulfuric acid, hydrochloric acid, hydrofluoric acid, chlor-alkali solutions, halogens

• Pharmaceutical & Biotechnology: Process water, WFI systems, CIP/SIP pipelines

• Semiconductor & Electronics: Ultra-pure water (UPW), etchants, chemical distribution systems

• Galvanoplastia y tratamiento de superficies: Electrolytes, plating baths, concentrated acids

• Metallurgy & Mining: Pickling lines, acidic exhaust gas scrubbing systems

• Environmental & New Energy: Wastewater treatment, flue gas desulfurization (FGD), lithium battery chemical transfer

Lining Material Options and Manufacturing Advantages

• PTFE (Polytetrafluoroethylene): Widest chemical resistance, highest temperature tolerance, excellent cost-performance

• PFA (Perfluoroalkoxy): Similar corrosion resistance to PTFE, better thermoplastic properties, seamless lining ideal for high-purity applications

• FEP (Fluorinated Ethylene Propylene): Semi-transparent, better vacuum resistance, suitable for visual flow monitoring

Advanced processes such as isostatic forming and full-face flange lining ensure uniform thickness, zero porosity, and superior resistance to thermal cycling and vacuum conditions. Each pipe undergoes 100% spark testing, pressure testing, and leak inspection before delivery.