Structure and composition of PTFE tubing

PTFE hoses are typically multi-layered composite structures. The core inner tube material is primarily PTFE (polytetrafluoroethylene), but variations such as carbon black-filled PTFE and PFA are also available to meet different needs, such as static dissipation. The reinforcing layer is usually a stainless steel braided layer, an aramid fiber braided layer, or a steel wire winding layer to improve pressure resistance and abrasion resistance. The outer layer can be without an outer layer, silicone resin, EPDM rubber, or synthetic rubber, providing physical protection and additional properties such as abrasion resistance and ozone resistance.

Termination types are diverse, including compression fittings, NPT threads, flanges, sanitary clamps, VCR/VCO fittings, etc., with 316 stainless steel being the most common material.

Based on the inner wall structure, they can be divided into corrugated inner wall hoses and smooth inner wall hoses. The corrugated inner wall improves flexibility, while the smooth inner wall reduces turbulence, making it suitable for high-purity applications. Hybrid structures also exist, such as a PTFE inner tube with a stainless steel corrugated sleeve (FP series), which balances flexibility and impermeability.