PTFE coils

PTFE coils are fluoropolymer products in coil or solid thin-bar/hollow tubular configurations, manufactured from 100% pure polytetrafluoroethylene (PTFE) resin through extrusion, compression molding, and winding processes; they are also commonly referred to as PTFE wire rods or PTFE coils. Depending on application requirements, these coils can be produced using pure PTFE material or modified with fillers (such as graphite, glass fiber, or carbon powder); they can also undergo sodiumization surface activation treatment. Featuring a complete flexible winding configuration, these coils serve as high-performance sealing and flow guidance profiles for corrosion resistance and high-temperature applications, and represent one of our company's core molded fluoropolymer products developed over more than 30 years of experience.

Core Physical & Chemical Properties

(1) Chemical Properties

1. Exceptional corrosion resistance: It is virtually resistant to all strong acids, strong alkalis, strong oxidizing agents, organic solvents, oils, and corrosive gases; only molten alkali metals and high-temperature fluorine gas may cause slight corrosion; under severe corrosive conditions, it remains stable, neither swelling nor decomposing over an extended period;

2. Chemical inertness: Does not undergo chemical reactions with the medium, exhibits no precipitation or contamination, and will not contaminate fluid materials;

3. Weather-resistant and anti-aging properties: When exposed to outdoor conditions, ultraviolet radiation, and ozone for extended periods, the material does not become brittle or crack, and its service life significantly exceeds that of rubber and conventional plastics.

(2) Physical Properties

1. Ultra-wide temperature resistance range: continuous operating temperature range of-200°C to +260°C; capable of withstanding instantaneous exposure to temperatures up to 300°C; does not harden or fracture at low temperatures, nor soften or flow at high temperatures;

2. Excellent electrical insulation properties: featuring high dielectric strength and extremely low dielectric loss; unaffected by frequency, temperature, or humidity; and maintaining stable insulation performance in high-frequency and high-voltage environments;

3. Extremely low friction coefficient: Among solid materials, it exhibits the lowest friction coefficient (0.04), is self-lubricating and non-adhesive, and features minimal sliding resistance;

4. Non-stick property: The surface is completely non-sticky, making it easy to demold viscous materials, resins, and colloids;

5. Flame-retardant and non-toxic: inherently meets UL94 V-0 flame retardancy standards, decomposes at high temperatures without releasing toxic or hazardous substances, and complies with food and medical contact safety standards;

6. The modified version can mitigate the cold-flow creep defects inherent in pure PTFE, thereby enhancing its dimensional stability as well as its wear resistance and compressive strength.

Application Areas and Specific Functions

1. Chemical Corrosion Protection Sector: Used for corrosion-resistant guide coils, instrument signal transmission pipes, and anti-corrosion lining strips to prevent pipeline corrosion and leakage, thereby ensuring the safety of chemical fluid transportation;

2. Medical Device Sector: Manufacturing of minimally invasive interventional catheters, drug delivery tubing, and medical sealing wires; these products exhibit excellent biocompatibility, are non-toxic and non-irritating, and can withstand high-temperature sterilization;

3. Aerospace and Defense Sector: hydraulic oil circuit piping for aircraft, insulation sheaths for wiring harnesses, and high-temperature resistant sealing coils that reduce weight while resisting extreme temperatures and corrosion from aerospace environments, thereby enhancing equipment reliability;

4. Electronic and electrical field: high-voltage wire insulation winding, terminal insulation sheaths, circuit board isolation strips—effectively preventing high-voltage breakdown and enhancing circuit safety and stability;

5. Mechanical equipment sealing field: packing materials, reciprocating wear-resistant sealing strips, pump and valve compensation coils; these components reduce shaft wear and lower leakage rates;

6. Food and pharmaceutical industry: material conveying coils, sealing pressure strips; resistant to boiling and cleaning processes, non-contaminating of pharmaceuticals and food products, and compliant with cleanroom production requirements;

7. New Energy Lithium Battery Industry: electrolyte flow channels, cell insulation isolation strips – corrosion-resistant to electrolytes, enhancing battery safety.

Compared with the core advantages of competing products

1. Controllable raw material purity: Produced from virgin, high-purity PTFE powder—no recycled or reclaimed materials are used—resulting in minimal impurities, no black spots, and significantly superior dimensional consistency compared to products from small-scale workshops;

2. Mature modification technology: allows for customized filling with graphite, glass fiber, carbon powder, or molybdenum disulfide, effectively resolving the pure PTFE cold flow deformation issue, while significantly enhancing wear resistance, compressive strength, and creep resistance;

3. Core surface treatment process: Supports single-sided or double-sided sodiumization activation treatment, effectively addressing the challenge of poor adhesion with PTFE; it enables easy bonding with rubber, metal, and adhesive materials—a capability that most conventional manufacturers cannot achieve with stable sodiumization treatment processes;

4. Flexible customization options: All coil specifications ranging from 0.5 mm to 10 mm can be mass-produced; the length can be customized according to customer requirements, ensuring that the coils are neatly wound without twisting or flattening;

5. Higher dimensional accuracy: The extrusion die undergoes precision machining, with strict control over wire diameter tolerances, ensuring uniform thickness across the entire coil and preventing assembly jams or inadequate sealing;

6. Delivery and Stability: With over 30 years of experience in fluoroplastic production, our products exhibit minimal batch-to-batch performance variation; we can provide material testing reports, ROHS compliance certificates, FDA compliance certificates, as well as complete export documentation.

Selection Guide

1. Select materials based on operating conditions

2. Select surface treatment based on functional requirements

• No adhesive required: simply select the un-sodiumized native PTFE coil;
• For applications requiring bonding to metal/rubber substrates, sodium-activated activated Teflon coils must be selected.

3. Key Parameters for Specification Selection

Solid rod: Confirm the wire diameter (e.g., 1 mm, 2 mm, 3 mm);

Hollow coil: Confirm outer diameter × inner diameter;

Length: Full roll for large coils / custom-cut single pieces;

Operating temperature: For temperatures exceeding 240°C, preferentially use the modified version.

Simple Selection Mnemonic Rules

High-purity raw materials for high-purity fluids; wear-resistant, creep-resistant properties with glass fiber reinforcement; for metal bonding, sodium treatment is required; for anti-static applications, graphite filler should be selected.

Precautions for Use 

(1) Installation and Usage Specifications

1. During bending, the minimum bending radius shall not be less than 3 times the wire diameter; this prevents forced hard bending that may cause internal hidden cracks, thereby extending service life and reducing replacement frequency;

2. For dynamic sealing applications involving reciprocating motion, filler-modified variants should be prioritized; these variants significantly reduce sealing failure caused by pure PTFE cold-flow creep and minimize equipment downtime and maintenance costs;

3. The sodium-treated surface is intended solely for bonding purposes; after bonding, avoid prolonged immersion in strong solvents to prevent detachment of the bonded layer and to ensure a high assembly pass rate.

(2) Operating condition restrictions to mitigate wear and tear

1. For long-term continuous use, the temperature should not exceed 260°C; exceeding this temperature will accelerate material aging and deformation, thereby reducing the product's durability;

2. Avoid using hard, sharp edges or corners to rub against or scratch the surface; such scratches will accelerate wear and compromise the sealing and flow guidance performance;

3. Pressurized pipelines must be matched with the corresponding wall thickness specifications; thin-walled coils shall not be subjected to high-pressure shocks to prevent pipe rupture or leakage that may lead to material loss.

(3) Storage and subsequent efficiency enhancement recommendations

1. Store in a cool, dry environment; sodium-treated products shall be stored in a light-proof sealed container to prevent failure of the activation surface, which could lead to adhesive rejection;

2. Batched custom-length cutting and shipping: once received by the customer, the parts can be directly loaded onto the assembly line, eliminating the need for secondary cutting labor costs and thereby enhancing production and assembly efficiency;

3. Replacement of components with uniform specifications under identical operating conditions; standardization of spare parts procurement reduces the variety of spare parts inventory and minimizes capital tie-up.

(4) Summary of the direct value to customers

Reduces equipment leakage failure rates, minimizes media waste, and lowers environmental treatment costs.

Extremely long service life, reducing spare parts procurement frequency and downtime-related operational losses

Corrosion-resistant design eliminates the need for frequent replacements, significantly reducing manual maintenance labor hours.

Compliant materials meet export certification requirements and help mitigate the risk of overseas customer qualification reviews.