Understanding Permeation in PTFE: Why Permeation Matters

Permeation refers to the ability of gases or liquids to pass through a material at the molecular level. Even chemically resistant materials like PTFE are not completely impermeable.

In applications such as:

• Chemical transfer lines
• Pharmaceutical processing
• Semiconductor manufacturing
• Gas handling systems

…low permeation is critical to prevent:

• Contamination
• Product loss
• Safety hazards (e.g. gas leakage)

Paste extrusion produces a tightly packed structure, which reduces microscopic pathways that allow permeation. In contrast, isostatic moulding results in a more random internal structure, increasing the likelihood of permeation over time.

Paste Extruded vs Isostatic PTFE