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PVDF pipe is a pipe made of polyvinylidene fluoride (PVDF) plastic through an extrusion process. PVDF is a highly non-reactive thermoplastic fluoropolymer known for its excellent purity, chemical corrosion resistance and mechanical strength. In addition to its excellent corrosion resistance, PVDF pipe also has high mechanical strength. Its tensile strength and bending strength are both high, and it can withstand large pressures and external forces, ensuring the safe use of pipes in various complex working environments.
1. Main characteristics and advantages
The excellent performance of PVDF pipe comes from its chemical structure. The main advantages include:
(1) Chemical corrosion resistance:
This is its most prominent advantage. It can withstand corrosion from most strong acids, strong bases, halogens (such as chlorine, bromine) and organic solvents.
Application: Widely used in chemical transportation, high-purity reagent distribution, electroplating solution transportation, etc.
(2) High purity and low precipitation:
PVDF itself is an inert material, not easy to react with the medium, and has very few additives. Its inner wall is smooth and not easy to adsorb or precipitate impurities.
Application: It is the preferred pipe material for high-purity water and ultrapure water delivery systems in the semiconductor, photovoltaic, biopharmaceutical, food and beverage industries, and can ensure that the fluid is not contaminated.
(3) Excellent heat resistance：
The continuous use temperature range is usually between -40°C and +140°C, and it can withstand higher temperatures for a short period of time. Its mechanical strength remains good at high temperatures. Application: It can be used for hot water, steam sterilization (SIP, Steam-In-Place) pipelines and high-temperature process fluid delivery.
(4) Good mechanical strength and pressure resistance：
It has good creep resistance, fatigue resistance, and impact resistance, a balance of rigidity and toughness, and a high working pressure. Natural flame retardancy PVDF itself is not easy to burn, and even if it burns, it will self-extinguish, meeting strict fire safety standards. Radiation resistance and weather resistance It can resist γ-rays and ultraviolet rays, is not easy to age, and can be used in some areas of the nuclear industry and outdoor environments.
2. Main Applications
PVDF pipes are used in many industrial fields due to their unique properties:
| Application Areas | Applications |
| Semiconductor and Photovoltaic | Ultrapure water (UPW) delivery, chemical distribution (CMP slurry, etching solution, photoresist), wastewater treatment |
| Biopharmaceutical | Water for Injection (WFI) systems, process liquid distribution piping, clean steam piping, cell culture bioreactor feed piping |
| Chemical Industry | Transport of various corrosive chemicals, solvents, acids, and alkalis |
| Food and Beverage | Transport of high-purity ingredients, alcohol, vinegar, and juice, FDA-compliant |
| Power and Lithium Batteries | Lithium battery binders and diaphragm coating materials, but can also be used as piping for electrolyte delivery |
| Environmental Protection and Water Treatment | Reverse Osmosis (RO) systems, membrane treatment components, wastewater recovery systems |
3. Connection Methods
The installation and connection of PVDF pipes are critical and directly impact the integrity of the system. The main methods are:
Butt fusion welding: The most common and reliable connection method. Using a dedicated PVDF welding machine, the ends of the pipe and fitting are heated and melted, then quickly butted and bonded together, creating a uniform weld consistent with the pipe's inherent properties. This operation requires a certified welder.
Union (VCR/VCP) connections: Utilize PVDF double-ferrule compression fittings or face-seal fittings (e.g., ISO standards). Suitable for applications requiring frequent disassembly and maintenance.
Flange connections: Used for interfacing with large equipment or other pipelines.
