High-Performance FEP Resin For Wire Insulation & Thin-Walled Tubes (Model: HD921)

High-Performance FEP Resin HD921: Heat Stress Crack Resistant, Ideal for Wire Insulation & Thin-Walled Tubes. Excellent Insulation & Processability, Reliable for Industrial/Electrical Applications.

High-Performance FEP Resin for Wire Insulation & Thin-Walled Tubes (Model: HD921) is a premium fluorinated ethylene propylene (FEP) copolymer synthesized from tetrafluoroethylene and hexafluoropropylene. As a modified derivative of PTFE (the "King of Plastics"), this translucent particle resin (melting index: 2.1~5.0 g/10min) inherits PTFE's core advantages-superior chemical inertness, electrical insulation, and thermal stability-while boasting better thermoplastic processability due to its branched-chain molecular structure. Specifically engineered for wire insulation layers and thin-walled tubes, HD921 features exceptional heat stress cracking resistance, ensuring consistent performance in demanding industrial and electrical environments. It complies with global quality standards, providing reliable material solutions for high-precision insulation and tubing manufacturing.

What is HD921 FEP Resin for Insulation & Tubes?
Fluorinated Ethylene Propylene (FEP) is a high-performance fluoropolymer copolymer of tetrafluoroethylene and hexafluoropropylene. Unlike linear PTFE with high crystallinity and poor processability, FEP adopts a branched-chain molecular structure, which reduces crystallinity, lowers melting point, and enables standard thermoplastic processing methods such as extrusion-critical for wire insulation and thin-walled tube production. Our HD921 FEP resin is a tailored grade optimized for these specific applications, with a precisely controlled melting index of 2.1~5.0 g/10min that balances melt flow and viscosity, ensuring smooth extrusion and uniform wall thickness.

Compared to other insulation materials like PVC or ETFE, HD921 FEP resin offers unparalleled advantages: it has a lower dielectric constant (≤2.15 at 10⁶Hz) than PVC, ensuring superior electrical insulation performance for high-frequency wires; it is more resistant to chemical corrosion than ETFE, making it suitable for harsh industrial environments where tubing may come into contact with solvents or chemicals. Its translucent appearance also allows for visual inspection of internal tube conditions, a key benefit for fluid transfer applications in medical or laboratory settings.

HD921's properties are specifically tailored to meet the rigorous requirements of wire insulation and thin-walled tube applications, supported by scientific principles and precise technical data:
● Exceptional Heat Stress Cracking Resistance: This is HD921's core advantage for insulation and tubing applications. Its optimized molecular weight distribution and branched-chain structure prevent crack formation even under repeated thermal cycles (from -200℃ to 200℃ continuous service). A 500-hour heat stress test at 150℃ shows no cracking or deformation, outperforming standard FEP grades by 30%-critical for wires and tubes that operate in temperature-fluctuating environments.
● Superior Electrical Insulation Performance: With a dielectric constant of ≤2.15 (10⁶Hz) and a dissipation factor of ≤7.0×10⁻⁴ (10⁶Hz), HD921 provides excellent electrical insulation, minimizing signal loss and ensuring safe operation of wires in high-voltage and high-frequency applications (e.g., aerospace wiring, industrial control cables). The non-polar nature of its molecular structure ensures stable insulation performance across a wide temperature range, unlike polar insulation materials that degrade at extreme temperatures.
● Optimized Processability for Extrusion: With a melting index of 2.1~5.0 g/10min, HD921 melts smoothly and flows uniformly during extrusion, enabling the production of thin, consistent insulation layers (as thin as 0.05mm) and thin-walled tubes (wall thickness ≤0.5mm) without defects like pinholes or unevenness. This processability advantage reduces production waste and improves efficiency compared to low-melt-flow FEP grades that require higher extrusion temperatures and pressures.
● Excellent Chemical Inertness: HD921 is inert to nearly all industrial chemicals, including strong acids, bases, organic solvents, ketones, and aromatics. This property ensures that thin-walled tubes made from HD921 can safely transfer corrosive fluids (e.g., in chemical processing plants) without degradation, and wire insulation remains intact even when exposed to harsh chemical environments-extending the service life of end-products.
● High Mechanical Strength: It boasts a tensile strength of ≥26 MPa and an elongation at break of ≥320%, providing sufficient toughness for wire insulation to withstand bending and abrasion during installation and use, and for thin-walled tubes to resist external impact without cracking. This mechanical strength is derived from the uniform molecular chain entanglement in the resin, ensuring consistent performance across all batches.
● Low Volatile Content & High Purity: With a volatile content of ≤0.1%, HD921 meets the high-purity requirements of medical and electronic industries. During extrusion, it releases minimal volatile substances, avoiding contamination of the production environment and end-products-critical for applications like medical fluid transfer tubes and electronic wire insulation.
● Thermal Stability: It maintains stable properties at continuous operating temperatures up to 200℃ and can withstand short-term exposure to 240℃. Its melting point of around 270℃ is ideal for extrusion processing, as it balances easy melting with resistance to thermal degradation during production.

Feature (F)
Translucent FEP particle resin (Model HD921); melting index 2.1~5.0 g/10min; tensile strength ≥26 MPa; elongation at break ≥320%; dielectric constant ≤2.15 (10⁶Hz); volatile content ≤0.1%; continuous service temperature -200℃~200℃; heat stress crack resistant.
 

Advantage (A)
Better processability than PTFE for extrusion; superior electrical insulation vs. PVC; higher chemical resistance than ETFE; excellent heat stress crack resistance for temperature fluctuations; uniform melt flow ensures consistent insulation/tube thickness; high purity and low volatility.
 

Benefit (B)
Reduces production waste and improves efficiency for manufacturers; ensures reliable wire insulation performance in high-voltage/high-frequency applications; extends service life of thin-walled tubes in corrosive environments; meets high-purity requirements for medical/electronic industries; minimizes maintenance and replacement costs for end-users.
 

Evidence (E)
Complies with ISO 9001, RoHS, and REACH standards; test report No. FEP-HD921-2024 confirms 500-hour heat stress cracking resistance at 150℃; an electrical wire manufacturer using HD921 achieved 99.5% extrusion yield for 0.1mm insulation layers, up from 95% with generic FEP; 1000-hour chemical immersion test shows no degradation in 98% sulfuric acid and 50% sodium hydroxide.

HD921 FEP resin is specifically engineered for two core application areas, leveraging its unique properties:
● Wire Insulation Layers: Ideal for high-frequency wires, aerospace wires, industrial control cables, and medical electrical wires. Its excellent electrical insulation, heat stress cracking resistance, and low dielectric loss ensure signal integrity and safe operation in extreme temperature and harsh environments.
● Thin-Walled Tubes: Suitable for medical fluid transfer tubes, laboratory chemical transfer tubes, and industrial thin-walled fluid pipelines. Its chemical inertness, high purity, and translucent appearance make it safe for transferring corrosive or high-purity fluids, while its mechanical strength ensures tube durability.

Packaging: Supplied in 25KG net weight sealed PE bags with outer drums to prevent contamination and moisture absorption.

Storage: Keep in a dry, cool (≤30℃) warehouse away from direct sunlight, heat sources, and incompatible materials. Avoid strenuous vibration, sunlight, and rain during transportation to prevent package damage. Ensure the resin remains clean to maintain product quality.

Shelf life: 2 years from the production date when stored as recommended.

Looking for a reliable FEP resin for wire insulation or thin-walled tube production? Contact our professional technical team to request free samples of HD921 FEP resin and a detailed technical datasheet. We provide tailored extrusion process guidelines to help you optimize production efficiency. Flexible order quantities (from 25KG trial batches to bulk orders), competitive pricing, and global delivery are available. Whether you need assistance with performance testing or application optimization, we are here to support you. Send an inquiry now or call our sales representative directly to discuss your specific needs!

25kg/woven bag, 800kg/pallet

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