ASTM D7472-19(2024) PDF

Overview

ASTM D7472-19(2024), Standard Specification for EFEP-Fluoropolymer Molding and Extrusion Materials, provides a comprehensive specification for melt processible materials made from EFEP-fluoropolymer. EFEP is a copolymer containing ethylene, tetrafluoroethylene, and hexafluoropropylene, delivered in pellet form and specifically intended for molding and extrusion applications. This standard details key classification parameters, requirements for material uniformity, and test methods for confirming physical and electrical properties. Blended or recycled materials are specifically excluded from its scope, ensuring consistency and high performance in end-use applications.

Key Topics

• Material Classification: EFEP materials are categorized into two types based on melting points, with each further subdivided into grades defined by melt flow rates.
• Physical Properties Requirements:
  • Specific gravity: Aligns with established industry ranges.
  • Melting point: Set limits for reliable processing.
  • Melt flow rate: Determines suitability for molding or extruding processes.
  • Tensile strength and elongation: Ensures mechanical durability of finished products.
• Electrical Properties:
  • Dielectric constant and dissipation factor: Confirmed per ASTM D150 for insulation performance.
• Sampling and Testing: Materials must be sampled using a statistical procedure to ensure lot uniformity and tested using referenced ASTM test methods, including ASTM D792 (specific gravity), D1238 (melt flow rate), D638 (tensile properties), and D3418 (thermal analysis).
• Packaging & Marking: Specifies commercial packaging standards and clear labeling of material type, grade, and quantity.

Applications

EFEP-fluoropolymer materials specified by ASTM D7472-19(2024) are valued for their balanced physical and electrical properties, chemical resistance, and processability. Key application areas include:

• Wire and Cable Insulation: Owing to their stable dielectric characteristics, EFEP-fluoropolymers are extensively used for insulating electrical wires and components.
• Industrial Linings and Tubing: Chemical resistance and processability make these materials suitable for fluid handling systems and protective linings.
• Automotive and Aerospace Components: High-performance EFEP grades are chosen for parts requiring durability, flexibility, and consistent electrical properties.
• Electronic Devices: Used as a molding and extrusion material for connectors, housings, and other electronic packaging requiring precise dielectric performance.
• Medical and Analytical Equipment: Stability, cleanliness, and processing consistency support use in sensitive applications.

Manufacturers, material specifiers, and quality control professionals benefit by using ASTM D7472-19(2024) to ensure EFEP-fluoropolymer materials meet defined mechanical and electrical property requirements for reliable product performance.

Related Standards

When working with EFEP-fluoropolymer molding and extrusion materials, the following related standards are often referenced in conjunction to ensure comprehensive quality assurance:

• ASTM D792: Test Methods for Density and Specific Gravity of Plastics by Displacement
• ASTM D1238: Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer
• ASTM D638: Test Method for Tensile Properties of Plastics
• ASTM D150: Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
• ASTM D3418: Test Method for Transition Temperatures and Enthalpies of Fusion and Crystallization of Polymers by Differential Scanning Calorimetry
• ISO 20568-1 / ISO 20568-2: International standards for fluoropolymer dispersions and molding and extrusion materials (data from ASTM D7472-19(2024) and these ISO standards are technically equivalent in key aspects)

By adhering to ASTM D7472-19(2024) and associated test standards, organizations can ensure their EFEP-fluoropolymer products are manufactured with predictable quality and compliant with international industry requirements.