I. Chemical Resistance Characteristics of PFA Fittings

• Broad-spectrum corrosion resistance: They remain stable against strong acids (such as sulfuric acid, nitric acid, hydrofluoric acid), strong alkalis (such as sodium hydroxide, potassium hydroxide), organic solvents (such as methanol, acetone, toluene), strong oxidants (such as potassium permanganate, hydrogen peroxide), etc., with almost no dissolution, swelling, or degradation.

• Chemical stability at high temperatures: Within a wide temperature range of -200°C to 260°C, their chemical resistance is hardly affected by temperature changes. Even in long-term contact with corrosive media at high temperatures, they can maintain structural integrity.

• Excellent impermeability: The dense molecular structure can effectively prevent the penetration of small-molecule chemical substances, avoiding aging of the fittings or contamination of the external environment due to internal medium penetration.

• Non-adsorptive property: The surface is highly inert, and it is not easy to adsorb impurities or pollutants (such as proteins, particles) in liquids or gases, making it suitable for high-purity fluid transmission (such as ultrapure water in the semiconductor industry and liquid medicines in the pharmaceutical industry).

II. Industrial Advantages of PFA Fittings

1. Adaptation to harsh working conditions
   In industries such as chemical engineering, pharmaceuticals, and semiconductors, production processes often involve strongly corrosive media or high-temperature environments. PFA fittings can replace metal (easily corroded) and ordinary plastic (insufficient temperature/chemical resistance) fittings, reducing leaks, equipment damage, or production interruptions caused by material failure, and lowering maintenance costs.
2. Guarantee of fluid purity

• Semiconductor industry: Used for the transmission of ultrapure water and electronic-grade chemicals (such as photoresist, etching solution), avoiding contamination of fluids by leachables from fitting materials and ensuring high-precision requirements in chip manufacturing.

• Pharmaceutical and biotechnology: Compliant with standards such as FDA and USP, they do not react with liquid medicines or release harmful substances, ensuring drug purity and biological safety.

3. Long-term stability and service life
   Compared with materials such as rubber and nylon, PFA fittings have stronger aging resistance. When in long-term contact with chemical media or exposed to ultraviolet rays and humid environments, they are not prone to cracking, hardening, or elastic attenuation. Their service life can reach several years or even longer, reducing downtime losses caused by frequent replacements.
4. Flexible installation and compatibility
   They can be adapted to PFA pipes or equipment of other materials through hot-melt welding, flange connection, etc. After installation, they have excellent sealing performance (low leakage rate) and are lighter than metal fittings, reducing the overall load of the system.
5. Compliance adaptation
   They meet industry standards for food contact materials (such as FDA 21 CFR 177.1550) and medical devices (such as ISO 10993), making them suitable for scenarios with extremely high requirements for material safety (such as food processing and fluid transmission in medical equipment).

Summary