What is a fluorine lined joint?

With the advancement of science and technology, the application range of new materials continues to increase. While the fine chemical industry is thriving, domestic production processes are also constantly improving rapidly. However, no matter how the process is improved, it is inseparable from the use of hydrochloric acid, sodium hydroxide, hydrogen peroxide solution, ethanol, acetone and other high-purity chemicals.

These chemicals typically have hazards such as strong corrosiveness, flammability, explosiveness, and high toxicity. Therefore, there is a high requirement for the corrosion resistance of pipelines to prevent leakage of chemical pipelines during transportation and cause safety accidents.

Taking common hydrochloric acid as an example, hydrochloric acid is not suitable for direct transportation through metal pipelines. Because:

Therefore, the traditional construction plan for hard pipe pipelines uses double sleeves, which are pipes made of PP or PVDF material inside PVC pipes.

And most of the soft connections are made of PP material pipe joints

PP is the abbreviation of Polypropylene, and its Chinese name is polypropylene. Polypropylene has good chemical stability. It is relatively stable to other chemical reagents except for being eroded by concentrated sulfuric acid and nitric acid. However, low molecular weight aliphatic hydrocarbons, Aromatic hydrocarbon and chlorinated hydrocarbons can soften and swell polypropylene. At the same time, its chemical stability increases with the increase of crystallinity, so polypropylene is suitable for making various chemical pipes and accessories, The anti-corrosion effect is good.

But its drawbacks are also quite obvious, such as temperature resistance, low low-temperature impact strength, and fragility; Aging due to exposure to light, heat, and oxygen. It is more suitable for making double set inner pipes, but it is often easily damaged when used at pipeline connections.

Therefore, there is an urgent demand for high-quality corrosion-resistant products in the market. Teflon is highly favored by the fluid industry due to its excellent corrosion resistance, chemical stability, and other characteristics, and is considered an ideal material for chemical transportation systems. However, how to successfully introduce Teflon into joints is a major challenge in the industry. With its own knowledge and experience, Shanghai Weilan has successfully developed a generation of fluorine lined joints after years of research and development.

The first generation fluorine lined joint is formed by sintering (melting and recasting) Teflon (PFA, FEP) particles on the surface of stainless steel under high temperature heating, and then finishing to obtain the joint product. The first generation fluorine lined joints have strong corrosion resistance and smooth inner walls, providing high-quality pipe joints specifically for the transportation of clean media, chemicals, and highly corrosive fluid media, meeting the vast majority of market demand.

Upgraded version - fluorine lined joint

However, the first generation fluorine lined joints have certain shortcomings due to process reasons, such as small diameter, affecting flow rate, etc., which cannot adapt to high demand applications. In this context, Shanghai Weilan has successfully developed the second generation fluorine lined joints.

Compared to the first generation fluorine lined joints, they have the following advantages:

Smooth surface

Larger diameter and smaller flow loss

Excellent conductivity

Lightweight

Yan Zhigao

Hebei Yuanbai provides various connection forms of fluorine lined joints, such as TC, flange, camlock, conversion head, etc., to meet different needs.

If you need more information about fluorine lined joints, you are welcome to consult Yuanbai Sales Engineer.