PTFE Film, or Polytetrafluoroethylene Film, is a high-performance fluoropolymer material renowned for its exceptional chemical resistance, thermal stability, and low surface energy. Often referred to by the DuPont brand name Teflon®, it serves as a critical component in demanding industrial and technological applications where reliability under extreme conditions is non-negotiable. Its unique molecular structure provides near-universal inertness, making it an indispensable solution for sealing, insulating, filtering, and releasing surfaces.
Our engineered PTFE films deliver a combination of properties unmatched by most other materials. These characteristics ensure long-term performance and cost-effectiveness across diverse applications.
We produce a comprehensive range of PTFE films tailored to specific industrial needs. Below are the detailed parameters for our standard product offerings.
| Parameter | Standard Value / Range | Test Method | Notes |
|---|---|---|---|
| Thickness | 0.025mm - 3.0mm | ASTM D374 | Custom thicknesses available |
| Density | 2.15 - 2.20 g/cm³ | ASTM D792 | Typical for virgin PTFE |
| Tensile Strength (MD) | 20 - 35 MPa | ASTM D882 | Machine Direction |
| Elongation at Break | 250 - 400% | ASTM D882 | |
| Dielectric Strength | 100 - 200 kV/mm | ASTM D149 | Varies with thickness |
| Continuous Service Temperature | -240°C to +260°C | — | No melting point; sinters at ~327°C |
| Filler Type | Typical Filler % | Key Enhanced Properties | Primary Applications |
|---|---|---|---|
| Glass Fiber | 15% - 25% | Improved creep resistance, stiffness, wear resistance | Gaskets, bearings, heavy-duty seals |
| Carbon / Graphite | 15% - 20% | Enhanced conductivity, reduced friction, improved wear | Anti-static components, conductive seals, bushings |
| Bronze | 40% - 60% | Greatly improved thermal conductivity, wear resistance | Thrust washers, bearing cages, high-load surfaces |
| Molybdenum Disulfide (MoS2) | 5% - 15% | Lower friction, improved lubricity without fibers | Food processing, dry lubricant films |
| Stainless Steel | 15% - 30% | Increased compressive strength, rigidity | Chemical-resistant rigid seals & spacers |
The versatility of PTFE film makes it a problem-solving material across sectors.
Q: What is the maximum temperature PTFE film can withstand?
A: PTFE film maintains useful mechanical properties over an exceptionally broad range. It can be used continuously from -270°C (-454°F) up to +260°C (+500°F) without significant degradation. Short-term exposures to even higher temperatures (up to 300°C) are possible, though some thermal aging may occur. It does not have a true melting point but transitions at around 327°C (621°F).
Q: Can PTFE film be easily bonded or laminated to other materials?
A: Due to its extremely low surface energy and non-stick nature, bonding untreated PTFE film is challenging. To achieve a strong adhesive bond, the film surface must first be modified. This is typically done through chemical etching (using sodium-based solutions) or plasma treatment. These processes create a microscopically rough, chemically active surface that allows epoxies, acrylics, or other adhesives to form a durable bond. We offer pre-treated films ready for lamination.
Q: What is the difference between skived PTFE film and cast PTFE film?
A: Skived film is produced by machining (skiving) a thin layer from a solid, sintered cylindrical billet of PTFE, much like peeling a log. This results in a film with high mechanical strength, excellent dimensional stability, and uniform properties, ideal for precision gaskets and seals. Cast film, also called "dispersion cast" film, is made by spreading a PTFE resin dispersion onto a carrier belt and then sintering. It is often softer, more conformable, and can be made very thin; it's commonly used for thread seal tape, cladding, and release liners.
Q: Is PTFE film safe for use in food processing or medical applications?
A: Yes, but specific compliance is crucial. Virgin, unpigmented PTFE resin is inherently inert and non-toxic. For food contact applications, the material must comply with relevant FDA regulations (e.g., 21 CFR 177.1550). For medical devices, it should meet USP Class VI standards for biocompatibility. It is essential to verify that the specific film grade you select has the necessary certifications and is manufactured in a controlled, contaminant-free environment for these sensitive uses.
Q: How does filled PTFE film differ from unfilled, and when should I use it?
A: Unfilled (virgin) PTFE has outstanding chemical and electrical properties but can exhibit cold flow (creep) under sustained load and has relatively high wear rates. Fillers like glass, carbon, or bronze are added to mitigate these weaknesses. Filled grades offer greatly improved creep resistance, reduced thermal expansion, higher stiffness, and better wear performance. The trade-off is often a slight reduction in chemical resistance and dielectric properties. Choose unfilled film for maximum chemical/electrical purity and filled grades for mechanical parts like bearings, seals, and rings that must maintain dimensional stability under pressure.
Q: Can PTFE film be machined or fabricated easily?
A: Yes, PTFE film is highly fabricable using standard workshop tools. It can be cleanly die-cut, stamped, punched, slit, skived, or CNC machined. Due to its flexibility and toughness, it handles well. Key considerations include using sharp tools to prevent tearing or deformation and managing the material's thermal expansion during machining for high-precision parts. Its non-abrasive nature means it does not rapidly wear down cutting tools.
Q: What are the limitations or considerations when designing with PTFE film?
A> While exceptionally versatile, designers must account for: 1) Creep/Cold Flow: Under continuous mechanical stress, it can slowly deform; use filled grades or design supports. 2) Permeability: It is permeable to gases and vapors, though at very low rates; not suitable as an absolute gas barrier over long periods. 3) Radiation: It has poor resistance to high-energy gamma or electron beam radiation, which can cause embrittlement. 4) Adhesion: Requires surface treatment for bonding, as mentioned. 5) Thermal Expansion: It has a high coefficient of thermal expansion, which must be accommodated in tight-tolerance assemblies.
Selecting the right PTFE film requires careful consideration of your application's mechanical, thermal, chemical, and electrical demands. Key steps include:
Our technical support team is available to assist with material selection, provide samples for testing, and discuss custom formulations to meet unique application challenges.
