Perfluoroethylene-propylene Copolymer (FEP)

CAS No.: 250-67-11-2
   Synonyms / IUPAC Name: Perfluoroethylene-propylene copolymer; FEP
   Molecular Formula: [–CF₂–CF₂–CF₂–CF(CF₃)–]ₙ
   Typical Density: ~2.12 – 2.17 g/cm³
   Melting Point: ~260–270 °C
   Appearance: Translucent to opaque pellets or powder; may be processed as sheet, tube, or film

Physicochemical Properties (Typical)

• Thermal Stability: Continuous service temperature up to ~200 °C; melt processing temperature higher
• Chemical Resistance: Excellent resistance to most chemicals and solvents except molten alkali metals and elemental fluorine
• Water Absorption: Very low (typically < 0.01% by weight)
• Electrical Properties: Dielectric constant ~2.1 at 1 MHz; dissipation factor ~0.0007; volume resistivity >10¹⁶ Ω·m
• Coefficient of Friction: Low, similar to PTFE and other fluoropolymers
• Processability: Thermoplastic, melt-processable by extrusion or injection (unlike PTFE)

Purity & Quality Standards

• Purity: Industrial grades typically ≥ 99%; free from visible contamination; metal inclusion < 1% by weight
• Melt Flow / Melt Index: Typically 0.8–12 g/10 min depending on grade
• Analytical Methods: Gel permeation chromatography (GPC) for molecular weight distribution; DSC for melting point; moisture content via Karl Fischer or equivalent
• Packaging: Supplied in moisture-sealed, static-resistant containers with batch identification
• Stability: Stable under normal handling; avoid extreme heat and reactive metals

Applications / Uses

• Wire & Cable Insulation: Excellent performance in high-temperature or chemically aggressive environments
• Tubing, Hose & Linings: Ideal for chemical processing piping, valves, and fittings due to chemical inertness
• Films & Sheets: Used in applications requiring transparency, electrical insulation, and chemical resistance
• Moulded Parts: Suitable for precision components needing thermoplastic processability and fluoropolymer properties
• Coatings & Linings: For vessels and equipment exposed to harsh or corrosive conditions

Safety & Handling

• Health Hazards:
• Low hazard in solid form; may release toxic fumes (HF, carbonyl fluoride) if overheated
• Molten material may cause thermal burns on skin contact
• Precautions:
• Ensure proper ventilation during melt processing
• Avoid inhalation of fumes and contact with hot polymer
• Use protective gloves, safety glasses, and face shield during cutting or molding
• Reactivity / Incompatibilities:
• Avoid molten alkali metals, fluorine, finely divided metals, and strong reducing agents
• Thermal decomposition above ~380–400 °C may release hazardous gases
• First Aid:
• Inhalation: Move to fresh air; seek medical attention if respiratory irritation occurs
• Skin Contact: Cool affected area with water; do not remove adhered polymer; seek medical treatment for burns
• Eye Contact: Rinse cautiously with water; seek medical attention if irritation persists

Packaging & Storage

• Packaging: Supplied in sealed, static-protected bags or drums, typically palletized
• Storage Conditions: Store below 30 °C in a dry, well-ventilated area away from direct sunlight and ignition sources
• Container Closure: Keep containers tightly sealed to prevent contamination or moisture ingress
• Shelf Life: Stable indefinitely when properly stored; inspect packaging integrity before use
• Transport: Generally non-hazardous in solid form; confirm local regulations for powders or molten states