FEP (fluorinated ethylene propylene) tubing—commonly referred to as Teflon® FEP tubing—is used in low‑pressure chromatography and laboratory applications where chemical inertness, flexibility, and non‑porous tubing walls are required. This tubing is commonly installed before the injector, after the detector, at mobile‑phase inlets, and on “to‑waste” lines in HPLC systems, as well as in low‑pressure LC and auxiliary laboratory workflows.
All MicroSolv™ FEP tubing is manufactured from virgin, high‑purity FEP resin and is chemically inert and non‑porous compared to PTFE tubing.
Why Choose FEP Tubing
FEP tubing is widely selected for applications where low permeability and chemical resistance are important, particularly in ion chromatography and micro‑fluidic systems.
Key characteristics include:
Extruded from virgin FEP with no fillers or additives
Non‑porous tubing wall, reducing gas and solvent permeation compared to PTFE
Excellent chemical resistance to common aqueous and ionic solutions
Flexible and easy to route in low‑pressure systems
Because of its tubing wall structure, FEP is often preferred where solvent composition must remain stable and unaffected by gas exchange.
Temperature & Pressure Considerations
FEP tubing is intended for low‑pressure applications.
Maximum recommended operating temperature: 80 °C
Operating FEP tubing above this temperature may compromise mechanical integrity and chemical resistance.
Dimensional Tolerances
FEP tubing is manufactured to controlled tolerances appropriate for low‑pressure chromatography applications:
1/16″ OD tubing: ± 0.05 mm
1/8″ OD tubing: ± 0.10 mm
These tolerances support reliable fittings engagement and consistent flow behavior in low‑pressure zones.
Purity & Manufacturing Control
All MICROSOLV™ FEP tubing:
Is manufactured from virgin fluoropolymer resin
Contains no plasticizers or performance‑altering additives
Uses color only for external identification, when applicable
This ensures predictable chemical behavior and compatibility with analytical workflows.
Typical Applications
FEP tubing is commonly used for:
Ion chromatography systems
Low‑pressure HPLC solvent handling
Mobile‑phase inlet lines
Waste and post‑detector tubing
Micro‑fluidic and auxiliary laboratory fluid paths
Specifications
👉 View polymeric tubing specifications and available sizes
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