What are the most prominent characteristics of PFA chemical hoses compared to other plastic hoses (such as PTFE and PVC)? And in which fields are they mainly used?

The most prominent characteristics of PFA chemical hoses lie in their excellent chemical resistance, extremely high purity, and outstanding flex fatigue resistance. Compared with PTFE (polytetrafluoroethylene), PFA can also resist almost all concentrated acids, strong alkalis, and organic solvents—including concentrated sulfuric acid and hydrofluoric acid—while offering better flexibility, lower tendency to undergo permanent bending deformation, and stronger stress cracking resistance. When compared with PVC, PFA has an extremely wide temperature resistance range (typically from -80℃ to +260℃), which is in a completely different class. Additionally, PFA resin itself is an ultra-pure material; unlike some plastics, it does not leach additives or metal ions. This ensures the purity of the conveyed medium and prevents contamination.
Based on these characteristics, PFA chemical hoses are mainly used in fields with extremely high requirements for cleanliness and corrosion resistance. For instance, in the semiconductor manufacturing industry, they are used to convey high-purity chemical reagents, ultrapure water, and etching solutions; in the pharmaceutical and bioprocessing industries, they are applied for the transfer of sterile fluids and the conveyance of culture media; in the fine chemical industry and laboratory analytical equipment, they are used to handle various corrosive chemicals. They are indispensable components in high-end manufacturing processes and critical process links.

What is the specific temperature resistance performance of PFA chemical hoses? What precautions should be taken when using them in high-temperature and low-temperature environments?

The most prominent characteristics of PFA chemical hoses lie in their excellent chemical resistance, extremely high purity, and PFA chemical hoses feature an extremely wide temperature resistance range, and can typically maintain excellent physical and chemical properties under operating conditions ranging from -80℃ to +260℃. At a high temperature of 260℃, they can operate continuously for a long time without melting or degrading, and their mechanical strength retention rate is much higher than that of ordinary plastics. Meanwhile, their glass transition temperature is extremely low, so they can still maintain good flexibility in ultra-low temperature environments without becoming brittle or cracking.
The following points should be noted in practical use: First, although PFA is resistant to high temperatures, if it is kept at the upper temperature limit for a long time, its service life will be shortened accordingly, and unnecessary heat exposure should be avoided as much as possible. Second, when it comes to operating conditions involving alternating high and low temperature cycles, due to the difference in thermal expansion coefficients between PFA and other metal fitting materials, special attention should be paid to the sealing reliability of the fitting connections. It may be necessary to use flanges or clamps with a compensating design. In addition, when used in an external high-temperature environment (such as near heaters or steam pipes), consideration should be given to adding thermal insulation layers to protect operators and slow down the possible thermal aging of the hose material. For low-temperature applications, ensure that the hose is above the allowable minimum temperature before bending operations to avoid damage caused by excessive stiffness.

What are the flexibility and service life of PFA chemical hoses? How to maximize their service life during installation and use?

PFA chemical hoses are renowned for their excellent flexibility and long service life. Unlike PFA rigid pipes of the same material, they do not require complex elbows, enabling easy piping in limited spaces and simplifying system design. They exhibit strong resistance to flex fatigue and can be repeatedly bent at small bend radii without breaking easily. In terms of service life, under proper usage conditions (not exceeding temperature and pressure limits, and compatible with the medium), PFA hoses can last for several years.
To maximize their service life, the installation and usage stages are crucial:First, avoid excessive bending. Although PFA hoses are flexible, the bend radius during installation should not be smaller than the minimum value recommended by the manufacturer. The bent part should be smooth; sharp folds or acute-angle bends must be avoided, as these will greatly reduce their pressure resistance and create stress concentration points.Second, prevent external abrasion and mechanical damage. Avoid friction between the hose and rough surfaces, or subjecting it to unnecessary stretching and twisting. Use protective sleeves at locations where friction may occur.Third, pay attention to system pressure pulses. Continuous and severe pressure fluctuations (water hammer effect) can cause cumulative damage to any hose, so pressure buffering should be considered when designing the system.Fourth, regularly inspect the hose surface for swelling, hardening, cracks, or discoloration—these are signs of aging, and the hose should be replaced in a timely manner.