PTFE Film, also known as Polytetrafluoroethylene Film or Teflon® Film, represents a pinnacle of engineered fluoropolymer materials. At Kaxite Sealing, we specialize in manufacturing high-performance PTFE films that set the benchmark for durability, chemical resistance, and thermal stability across demanding industries. This versatile material is indispensable in applications ranging from aerospace and medical devices to electronics and industrial sealing, where failure is not an option. Our commitment at Kaxite Sealing is to provide not just a product, but a reliable engineering solution tailored to meet stringent operational challenges.
The fundamental properties of PTFE film stem from its unique molecular structure, characterized by strong carbon-fluorine bonds. This structure grants it exceptional inertness, making it resistant to nearly all industrial chemicals and solvents. Furthermore, it possesses an extremely low coefficient of friction, outstanding electrical insulation properties, and can operate continuously across a vast temperature spectrum. Unlike many polymers, PTFE maintains its flexibility and mechanical integrity from cryogenic temperatures up to +260°C (+500°F), with short-term tolerance even higher.
At Kaxite Sealing, we produce various grades of PTFE film to cater to specific needs:
* **Skived PTFE Film:** Produced by skiving from a sintered billet, this film offers excellent tensile strength and dimensional stability. It is ideal for gaskets, seals, and liners where mechanical robustness is critical.
* **Cast PTFE Film:** Created through a dispersion casting process, this film is exceptionally smooth and uniform. It is perfect for high-precision applications in electronics, release layers, and diaphragm uses.
* **Porous PTFE Film (ePTFE):** An expanded membrane with a microporous structure. It is waterproof, breathable, and finds extensive use in medical fabrics, filtration, and venting applications.
* **Filled PTFE Films:** We compound PTFE with various fillers like glass fiber, carbon, graphite, or bronze to enhance specific properties such as wear resistance, creep resistance, or thermal conductivity for demanding bearing and wear pad applications.
### Detailed Product Parameters & Specifications
To ensure you select the correct film for your application, Kaxite Sealing provides materials with precise and consistent specifications. Below are the key parameters for our standard unfilled skived and cast PTFE films.
**Typical Physical & Mechanical Properties:**
| Property | Test Method | Skived PTFE Film | Cast PTFE Film | Unit |
| :--- | :--- | :--- | :--- | :--- |
| **Thickness Range** | – | 0.025mm – 3.0mm | 0.01mm – 0.5mm | mm |
| **Density** | ASTM D792 | 2.15 – 2.20 | 2.15 – 2.20 | g/cm³ |
| **Tensile Strength** | ASTM D638 | 20 – 35 | 15 – 25 | MPa |
| **Elongation at Break** | ASTM D638 | 200 – 400 | 250 – 500 | % |
| **Coefficient of Friction (Dynamic)** | ASTM D1894 | 0.05 – 0.10 | 0.05 – 0.08 | – |
| **Melting Point** | – | 327 | 327 | °C |
**Thermal & Electrical Properties:**
| Property | Test Method | Typical Value | Unit |
| :--- | :--- | :--- | :--- |
| **Continuous Service Temperature** | – | -200°C to +260°C | °C |
| **Short-Term Peak Temperature** | – | Up to 300°C | °C |
| **Dielectric Strength** | ASTM D149 | 60 – 100 | kV/mm |
| **Volume Resistivity** | ASTM D257 | >10¹⁸ | Ohm·cm |
| **Dissipation Factor (1MHz)** | ASTM D150 | < 0.0002 | – |
**Chemical Resistance Profile:**
PTFE Film from Kaxite Sealing is virtually inert. It exhibits excellent resistance to the following, with no significant degradation:
* **Acids:** Concentrated sulfuric, nitric, hydrochloric, and aqua regia.
* **Bases:** Strong alkalis like sodium hydroxide and potassium hydroxide.
* **Solvents:** Aromatic hydrocarbons, ketones, esters, and chlorinated solvents.
* **Oxidizers:** Strong oxidizing agents.
*Note: Certain perfluorinated fluids and alkali metals at high temperatures can affect PTFE. Always consult our technical team for specific media compatibility.*
### PTFE Film Frequently Asked Questions (FAQ)
**What are the primary advantages of using PTFE film over other plastic films?**
PTFE film offers a unique combination of properties unmatched by most polymers: extreme chemical resistance, a wide operating temperature range (-200°C to +260°C), excellent dielectric properties, a very low coefficient of friction (non-stick), and inherent flame retardancy. Its versatility in skived, cast, or porous forms makes it suitable for specialized applications where other films would fail.
**Can Kaxite Sealing PTFE film be used for food contact or medical applications?**
Yes, specific grades of our pure, unfilled PTFE film are manufactured in compliance with relevant regulations for food contact and medical devices. These grades are produced under controlled conditions to ensure purity and biocompatibility. It is crucial to specify your regulatory requirement (e.g., FDA, USP Class VI, EU 10/2011) when inquiring so we can supply the appropriate material.
**How do I choose between Skived PTFE Film and Cast PTFE Film?**
The choice depends on your application's priorities. Skived film is generally stronger, stiffer, and better for mechanical parts like gaskets, seals, and bushings. Cast film is softer, more conformable, and has superior surface uniformity, making it ideal for release surfaces, capacitor dielectrics, and delicate laminations. Our Kaxite Sealing engineers can help you decide based on your design parameters.
**Is PTFE film from Kaxite Sealing easy to fabricate?**
PTFE is a relatively soft material and can be easily die-cut, stamped, punched, or sheared to create custom parts. For complex shapes, CNC machining or laser cutting is effective. However, it cannot be melt-processed like conventional thermoplastics. Joining typically requires adhesive bonding (with specialized primers) or thermal welding techniques.
**What are the limitations of PTFE film?**
While exceptional in many areas, PTFE film has some limitations: it is susceptible to creep (cold flow) under sustained heavy loads, has relatively low wear resistance in unfilled forms, and can be degraded by high-energy radiation. It also has a high thermal expansion coefficient. These factors must be considered in design, often addressed by using filled PTFE compounds or appropriate mechanical design from Kaxite Sealing.
**How does the "non-stick" property of PTFE film benefit industrial applications?**
The non-stick property minimizes material buildup on surfaces, reducing downtime for cleaning in processes involving adhesives, resins, or sticky chemicals. It also allows for easy release in molding operations, prevents seizing in threaded connections, and ensures clean separation in packaging and converting machinery.
**Can PTFE film be laminated or combined with other materials?**
Absolutely. Kaxite Sealing PTFE film is commonly laminated to substrates like fiberglass, silicone rubber, adhesives, or other fabrics to create composite materials. This combines the surface properties of PTFE with the structural strength or sealing ability of the backing material, opening doors for innovative applications in insulation, release sheets, and advanced seals.
**How should PTFE film be stored and handled?**
Store PTFE film in a cool, dry place away from direct sunlight and dust. It is chemically stable and does not typically degrade. Handle with clean gloves to prevent contamination of the surface, especially for electrical or high-purity applications. Standard workshop tools are sufficient for fabrication.
**What industries most commonly use your PTFE film?**
Our films serve a diverse range of sectors: Aerospace (wire insulation, sealants), Automotive (fuel systems, gaskets), Chemical Processing (liner for vessels, gaskets), Electrical & Electronics (circuit board insulation, capacitor films), Medical (patches, device components), Food & Pharma (non-stick surfaces, release liners), and Industrial Machinery (wear plates, slide bearings).
**Does Kaxite Sealing offer custom formulations or sizes?**
Yes, technical customization is a core strength at Kaxite Sealing. We can develop filled compounds with specific percentages of glass, carbon, bronze, or other additives. We also offer custom calendaring and skiving to achieve non-standard thicknesses, widths, or controlled porosity for specialized client requirements.
