{"id":37309,"date":"2026-06-22T03:28:56","date_gmt":"2026-06-22T03:28:56","guid":{"rendered":"https:\/\/dimud.com\/?p=37309"},"modified":"2026-06-18T03:29:09","modified_gmt":"2026-06-18T03:29:09","slug":"fep-plastic","status":"publish","type":"post","link":"https:\/\/dimud.com\/ru\/fep-plastic\/","title":{"rendered":"The Complete Guide to FEP Plastic Injection Molding: Properties, Chemical Compatibility, and Industrial Applications"},"content":{"rendered":"\t\t
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Are you looking for a material that \u201ccan be injection molded, is resistant to strong acids, and has properties similar to PTFE\u201d? Then you should take a closer look at FEP plastic. It is one of the few members of the fluoroplastic family that can be mass-produced using standard melt processing techniques, while offering chemical inertness comparable to PTFE and optical transparency that PTFE lacks.<\/p>

However, FEP plastic is not a material that can simply be used without careful consideration. It places extremely high demands on the injection molding process, has a narrow processing window, and exhibits an unusually low melt viscosity; even the slightest misstep can lead to a series of part defects. For factories without experience in fluoroplastic injection molding, the failure rate for FEP plastic is significantly higher than that of general-purpose engineering plastics.<\/p>

The Dimud team has systematically accumulated process expertise in the field of high-performance fluoroplastic injection molding. This article will systematically outline the core knowledge of FEP plastic from three perspectives\u2014materials science, engineering selection, and practical processing\u2014to help engineers and procurement teams make informed decisions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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What is FEP Plastic?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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The full name of FEP plastic is Fluorinated Ethylene Propylene, which is a copolymer of tetrafluoroethylene (TFE) and hexafluoropropylene (HFP). DuPont was the first to commercialize it in the 1960s under the brand name Teflon\u00ae FEP; since then, Daikin\u2019s Neoflon\u00ae FEP and 3M\/Dyneon\u2019s Dyneon\u00ae FEP have become the main competing brands.<\/p>

The development of FEP plastic had a clear engineering rationale: PTFE offers excellent performance but cannot be processed by melting; it can only be sintered or machined, resulting in extremely low mass production efficiency. FEP introduces HFP side chains into the TFE main chain, disrupting PTFE\u2019s highly ordered crystalline structure to reduce melt viscosity to a level suitable for injection molding and extrusion, while retaining the vast majority of fluoroplastic properties. The HFP content typically ranges from 10% to 20% by weight; this formulation window precisely controls the crystallinity (approximately 40%\u201360%) and melt flow rate (MFR) of FEP plastic.<\/p>

From a chemical structural perspective, FEP is a semi-crystalline perfluorinated polymer\u2014all hydrogen atoms on the main chain and side groups are replaced by fluorine atoms, and the bond energy of the C\u2013F bond is approximately 485 kJ\/mol, which is the fundamental reason for its extremely high chemical inertness.<\/p>

As an FEP plastic fabricator, the Dimud engineering team conducts systematic DFM<\/a> reviews prior to the launch of every FEP injection molding project to ensure that the material properties are fully aligned with the part design and mold solution.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Core Properties and Specifications of FEP Plastic<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Understanding the properties of FEP plastic is essential for making material selection decisions. The following summarizes key parameters from multiple perspectives:<\/p>

Thermal Performance<\/h3>
Performance Metrics<\/th>Typical values<\/th><\/tr><\/thead>
Melting Point (Tm)<\/td>255\u2013265 \u00b0C<\/td><\/tr>
Continuous operating temperature<\/td>-200 \u00b0C – +200 \u00b0C<\/td><\/tr>
Heat Deflection Temperature (HDT, 0.45 MPa)<\/td>70\u201375 \u00b0C<\/td><\/tr>
Coefficient of Thermal Expansion (CTE)<\/td>135\u2013170 \u00d7 10\u207b\u2076 \/K<\/td><\/tr>
Thermal conductivity<\/td>0.19\u20130.25 W\/(m\u00b7K)<\/td><\/tr><\/tbody><\/table><\/div>

FEP plastic has a continuous service temperature of up to 200\u00b0C, offering a significant advantage over PVDF (150\u00b0C). It also exhibits excellent low-temperature performance, maintaining flexibility at temperatures as low as -200\u00b0C without becoming brittle or fracturing, making it the material of choice for low-temperature fluid piping and components used in liquid nitrogen equipment.<\/p>

Mechanical properties<\/h3>
Performance indicators<\/th>Typical value<\/th><\/tr><\/thead>
Tensile strength<\/td>20\u201325 MPa<\/td><\/tr>
Elongation at break<\/td>250\u2013330%<\/td><\/tr>
Flexural modulus<\/td>500\u2013700 MPa<\/td><\/tr>
Hardness (Shore D)<\/td>55\u201360<\/td><\/tr>
Impact Strength (Notched Izod)<\/td>No gaps, no cracks<\/td><\/tr><\/tbody><\/table><\/div>

FEP plastic has a tensile strength significantly lower than that of PVDF, PEEK, or PPS, and its flexural modulus is also lower; it is classified as a \u201cflexible high-performance material\u201d rather than a \u201crigid structural material.\u201d This characteristic makes it ideal for use in seals, piping assemblies, and thin-walled flexible parts, but it is not suitable for structural components subjected to high loads.<\/p>

Electrical performance<\/h3>
Performance indicators<\/th>Typical value<\/th><\/tr><\/thead>
Dielectric constant (10\u2076 Hz)<\/td>2.0\u20132.1<\/td><\/tr>
Dielectric loss (tan \u03b4)<\/td><0.001<\/td><\/tr>
Volume resistivity<\/td>>10\u00b9\u2078 \u03a9\u00b7cm<\/td><\/tr>
Dielectric strength<\/td>20\u201324 kV\/mm<\/td><\/tr><\/tbody><\/table><\/div>

FEP plastic has one of the lowest dielectric constants (approximately 2.1) among all thermoplastic polymers. It exhibits extremely low dielectric loss and electrical insulation properties comparable to those of PTFE, making it the standard choice for aerospace-grade cable insulation and high-frequency communication cable jackets.<\/p>

Other Key Attributes<\/h3>