PTFE Skived Sheets are premium-grade, high-performance engineered plastic sheets manufactured through a precise skiving (peeling) process from a cylindrical molded billet of virgin PTFE (Polytetrafluoroethylene). This meticulous production method results in sheets with exceptional dimensional stability, uniformity, and superior mechanical properties compared to other forming techniques. As a foundational material across countless industries, from aerospace and semiconductor manufacturing to food processing and pharmaceutical applications, the quality and consistency of skived PTFE sheet are paramount. At Kaxite Sealing, we specialize in producing industry-leading PTFE skived sheets that meet the most demanding specifications for chemical resistance, thermal stability, and low friction.
The skiving process is what sets these sheets apart. It involves rotating a solid, sintered PTFE cylinder against a fixed, razor-sharp blade, "peeling" off a continuous sheet of precise thickness. This method aligns the PTFE's molecular structure, enhancing its strength and consistency in the machine direction. The resulting sheets boast a smooth, dense surface finish ideal for gaskets, seals, liners, and insulating components where reliability cannot be compromised.
### Key Parameters and Specifications of Kaxite Sealing PTFE Skived Sheets
To ensure engineers, designers, and procurement specialists can select the exact material for their application, we provide detailed specifications. Below are the critical parameters that define our product range.
**Primary Material Properties:**
* **Chemical Resistance:** Inert to virtually all industrial chemicals and solvents, including strong acids, alkalis, and oxidizing agents. It is unaffected by moisture and will not rot or degrade.
* **Temperature Range:** Consistently performs from -200°C (-328°F) to +260°C (+500°F) with short-term tolerance up to 300°C (572°F).
* **Coefficient of Friction:** Exceptionally low (typically 0.05 – 0.10), making it an excellent bearing and anti-stick surface.
* **Dielectric Strength:** Outstanding electrical insulator, with high dielectric strength and low dissipation factor across a wide frequency range.
* **Non-Stick Properties:** The surface energy is extremely low, preventing adhesion of most materials.
* **FDA Compliance:** Many of our grades are compliant with FDA regulations 21 CFR 177.1550 for use in food contact applications.
* **UV & Weather Resistance:** Excellent resistance to weathering and UV radiation, suitable for long-term outdoor use.
**Standard Available Sizes & Dimensions:**
Our sheets are produced to standard sizes but can be custom-cut to meet specific requirements.
| Parameter | Standard Range | Notes / Tolerance |
| :--- | :--- | :--- |
| **Thickness** | 0.1mm (0.004") to 5.0mm (0.197") | Common thicknesses: 0.5mm, 1mm, 1.5mm, 2mm, 3mm. Tight tolerances maintained. |
| **Width** | Up to 1500mm (59") | Width is typically determined by the billet size and skiving direction. |
| **Length** | Continuous rolls or cut sheets | Rolls for thin gauges; sheets standard at 1000mm x 1000mm or 1200mm x 1200mm. |
| **Color** | Natural White (Virgin), Black (carbon-filled), Brown (graphite-filled) | Virgin PTFE is white. Additives like carbon or graphite modify properties. |
**Grades and Formulations:**
Kaxite Sealing offers various formulations to enhance specific properties of the base PTFE.
| Grade Code | Description | Key Enhanced Properties | Typical Applications |
| :--- | :--- | :--- | :--- |
| **KX-PTFE-V** | Virgin, 100% pure PTFE | Ultimate chemical purity, electrical insulation, FDA compliance. | Gaskets for aggressive chemicals, semiconductor liners, food processing seals. |
| **KX-PTFE-C** | Glass Fiber Filled | Improved compressive strength, reduced creep (cold flow), better wear resistance. | Heavy-duty gaskets, bushings, bearings, thrust washers. |
| **KX-PTFE-B** | Carbon Filled | Superior wear resistance, excellent thermal conductivity, anti-static properties. | Piston rings, compressor rings, seals in dry running applications. |
| **KX-PTFE-G** | Graphite Filled | Enhanced lubrication, lower friction, improved thermal conductivity. | Packing rings, valve seats, applications requiring self-lubrication. |
| **KX-PTFE-BR** | Bronze Filled | Greatly improved thermal conductivity and wear resistance, high load-bearing capacity. | Bearings for high loads and low speeds, wear plates. |
### Physical & Mechanical Properties Data Table
The following table provides quantitative data on the core physical and mechanical properties of our standard virgin PTFE skived sheet (Grade KX-PTFE-V). Properties of filled grades will vary accordingly.
| Property | ASTM Test Method | Metric Unit | Imperial Unit | Value / Range |
| :--- | :--- | :--- | :--- | :--- |
| **Density** | D792 | g/cm³ | lb/in³ | 2.14 - 2.20 |
| **Tensile Strength** | D638 | MPa | psi | 20 - 35 |
| **Elongation at Break** | D638 | % | % | 200 - 400 |
| **Compressive Strength** | D695 | MPa | psi | 12 - 15 |
| **Flexural Modulus** | D790 | MPa | psi | 500 - 700 |
| **Izod Impact (Notched)** | D256 | J/m | ft-lb/in | 160 - 190 |
| **Hardness (Shore D)** | D2240 | Scale D | Scale D | 50 - 60 |
| **Coefficient of Friction (Dynamic)** | D1894 | - | - | 0.05 - 0.10 |
| **Thermal Conductivity** | C177 | W/m·K | BTU·in/(hr·ft²·°F) | 0.24 - 0.26 |
| **Linear Coefficient of Thermal Expansion** | D696 | 10⁻⁵/°C | 10⁻⁵/°F | 12 - 16 |
| **Continuous Service Temperature** | - | °C | °F | -200 to +260 |
| **Dielectric Strength** | D149 | kV/mm | V/mil | 40 - 60 |
### Frequently Asked Questions (FAQ) About PTFE Skived Sheets
**What is the main advantage of a skived PTFE sheet over a molded or extruded sheet?**
The skiving process produces sheets with greater dimensional consistency, superior surface finish, and enhanced mechanical properties in the plane of the sheet. It allows for very thin, uniform sheets that are difficult to achieve through molding, and it results in a denser, less porous material than extruded sheets, leading to better sealing performance and creep resistance.
**How does the thickness tolerance of a skived sheet compare to other forms?**
Skived sheets from a reputable manufacturer like Kaxite Sealing offer exceptionally tight thickness tolerances, often within ±10% for standard thicknesses. This precision is crucial for applications like gasketing, where consistent compression is needed for an effective seal, and is generally superior to the tolerances achievable with calendered or molded sheets.
**Can PTFE skived sheets be easily machined or fabricated?**
Yes, one of the key benefits of PTFE skived sheet is its excellent machinability. It can be cleanly cut, punched, stamped, skived (to reduce thickness further), and turned on a lathe using standard workshop tools. Sharp tools and proper securing are recommended to prevent deformation due to the material's softness.
**What is "creep" or "cold flow," and how do filled grades like KX-PTFE-C or KX-PTFE-B help?**
Creep, or cold flow, is the tendency of a material to deform permanently under sustained mechanical stress (load) over time, even at room temperature. Virgin PTFE is somewhat susceptible to this. Adding fillers like glass fiber, carbon, or bronze significantly reduces this creep, improves compressive strength, and enhances the material's ability to retain its shape under load, making filled grades essential for bearing applications or bolted flanges.
**Are Kaxite Sealing PTFE sheets suitable for use in oxygen service or with strong oxidizers?**
While PTFE is generally highly chemically inert, special consideration must be given to applications involving pure oxygen or strong oxidizers at high pressures and temperatures. We offer specially processed and tested grades for such critical services. It is essential to consult our technical team with your specific application parameters to ensure safety and material suitability.
**What cleaning methods are recommended for PTFE skived sheets?**
Due to its non-stick and chemically inert nature, PTFE is very easy to clean. Most contaminants can be wiped away. For thorough cleaning, use warm water with a mild detergent. Isopropyl alcohol is also effective for removing oils. Avoid abrasive pads or harsh chemicals that could scratch the surface, though PTFE is highly resistant to chemical attack.
**How should PTFE skived sheets be stored before use?**
Sheets should be stored in a cool, dry, and dark environment away from direct sunlight and heat sources. They should be kept flat, ideally on a shelf or pallet, to prevent curling or deformation. Avoid placing heavy objects on top of unprotected sheets to prevent permanent indentation.
**Can these sheets be bonded or laminated to other materials?**
Bonding PTFE is challenging due to its non-stick nature. For creating composite materials or adhesive-backed parts, the surface requires specialized chemical etching (like sodium napthalene treatment) or plasma treatment to create a bondable surface. Kaxite Sealing can supply pre-treated sheets or sheets laminated with other materials like rubber or foam based on customer specifications.
