Carbon Fiber Filled PTFE Gasket with Density 2.14 Suited for Sinter Piston
Product Overview
Engineered as a high-performance piston band for suspension systems, this carbon fiber filled PTFE gasket delivers exceptional creep resistance and dimensional stability at a precisely controlled density of 2.14 g/cm³. Manufactured using automated mold pressing technology, it provides the consistent thickness and surface finish required for sintered piston assemblies in modern automotive dampers.
Addressing Your Application Challenges
Cold Flow and Creep Under Sustained Load: Unfilled PTFE deforms over time under continuous compressive loading, causing piston band clearance changes that degrade damping performance. Carbon fiber reinforcement dramatically improves creep resistance, maintaining precise piston-to-cylinder clearance throughout the damper's service interval.
Piston Band Fitment Variability: Inconsistent gasket thickness causes assembly line fitting issues and performance variation between dampers. Our mold-pressed manufacturing process with tight thickness tolerance control ensures uniform fitment and consistent damping characteristics across production batches.
Thermal Cycling Dimensional Instability: Repeated heating and cooling cycles cause liner thermal expansion mismatches in piston assemblies. Carbon fiber filling reduces the coefficient of thermal expansion, providing superior thermal dimensional stability across the -200°C to 260°C operating range.
Electrical Insulation Requirements: Certain suspension designs require electrical isolation between piston and cylinder bore to prevent galvanic corrosion. Pure PTFE offers the best electrical insulation properties of all plastic materials, ensuring reliable isolation in demanding applications.
Material Grade Selection Complexity: Choosing the wrong PTFE compound results in premature failure or unnecessary cost. Our comprehensive grade portfolio (XYGF glass fiber, XYG graphite, XYB bronze, XYC carbon series) enables application-optimized material selection with full technical support.
Technical Specifications
| Material | pure PTFE |
| Color | White |
| High and low temperature resistance | -200 - 260°C |
| Processing | Machine by mold |
| Dynamic friction coefficient | 0.2-0.3 |
Key Performance Attributes
1. Low water absorption
2. Corrosion resistance
3. Temperature resistance
4. High diaphaneity
5. Voltage resistance
Material Description
1. Good tensile strength
2. High insulation
3. Best corrosion-resistant
4. Low friction
5. Abrasion resistance
PTFE has a wide range of practicable temperature from -180 ~ 260°C and a wax-like surface to which anything hardly sticks. PTFE has the lowest coefficient of friction of all known solid materials. It has the best electrical properties of all plastics.
Available Material Grades
| Code No. | Additive | % | Modification | Application |
XYGF-15
XYGF-20
XYGF-25 | Glass fiber powder | 15
20
25 | Anti-abrasion, low friction, electrical environment and creep-resistant | Bearing, gasket, valve seat, liner and other mechanical and electronic use |
| XYG-15 | Graphite | 15 | Anti-corrosion, low friction and creep-resistant | Mechanical and chemical anti-corrosion |
| XYB-60 | Bronze powder | 60 | Creep-resistant, low friction and heat conductivity | Plunger ring, supporting gasket and other bearing mechanical use |
XYC-20
XYC-20(S) | Hard carbon
Soft carbon | 20 | Creep-resistant, low friction, other application in water and liquid media | Sealing ring, filler and bearing, etc. |
Industry Applications
Pipe coupling fittings
Valve disc/plate/bushing/sleeve
Insulators/electric components
Pipe connectors/impeller/gasket
Medical device parts
Molded PTFE rod can be used as lining, seal components, wire isolation, slide block, gasket, seal, dielectric material, etc.
Manufacturing & Service Advantages
1. Good service: We treat clients as friends
2. Good quality: We have strict quality control system. Good reputation in the market
3. Quality Control: Approved by GB/T 19001-2008/ ISO9001:2008
4. Fast and cheap delivery: We have big discount from forwarder(Long Contract)
Frequently Asked Questions
Q1: Which PTFE grade should I select for my piston band application?
The optimal grade depends on your specific operating conditions. For high-wear applications, we recommend XYGF (glass fiber) series at 15-25% loading. For thermal conductivity and creep resistance, XYB-60 (bronze filled) or XYC-20 (carbon filled) are excellent choices. For chemical processing environments, XYG-15 (graphite filled) provides superior anti-corrosion performance. Our technical team can assist with grade selection based on your full application requirements.
Q2: What is the significance of the 2.14 density specification for carbon-filled PTFE?
Density is a critical indicator of filler content uniformity and sintering quality. A density of 2.14 g/cm³ for carbon fiber filled PTFE indicates optimal filler dispersion and complete sintering, translating to consistent mechanical properties, predictable wear rates, and reliable creep resistance. We control density to tight tolerances through computer-monitored pressing and sintering parameters.
Q3: Can you provide electrical insulation testing data for your PTFE gaskets?
Yes. PTFE possesses the best dielectric properties of all plastic materials, with a dielectric strength exceeding 18 kV/mm for pure grades. For applications requiring verified electrical insulation, we can provide dielectric strength test reports and volume resistivity measurements as part of the Certificate of Analysis. Note that filled grades have slightly reduced electrical properties depending on filler type and loading.
Q4: What is your molding tolerance capability for thin PTFE gaskets?
Our mold-press process achieves thickness tolerances of ±0.05mm on gaskets as thin as 0.5mm. For outer/inner diameter tolerances, we typically hold ±0.05mm on dimensions up to 50mm and ±0.10mm for larger sizes. Tighter tolerances can be achieved through post-machining when required. We recommend sharing your tolerance stack-up requirements during the RFQ stage for feasibility confirmation.
Q5: How does carbon fiber filling compare to glass fiber filling for damper piston bands?
Carbon fiber filling provides superior thermal conductivity and lower thermal expansion compared to glass fiber at equivalent loading percentages. Carbon-filled PTFE also generates less abrasive wear on mating metal surfaces, making it preferable for high-cycle damper applications. Glass fiber, however, offers better electrical insulation properties and is more cost-effective for less demanding applications. We stock both grades and can advise based on your performance priorities.
Q6: Do you offer rapid prototyping services for new piston band designs?
Yes. Our new molding turnaround is approximately 7 days for simple geometry, enabling rapid design iteration. We can produce prototype quantities from CNC-machined PTFE stock for initial fitment and function testing before committing to production mold tooling. This hybrid approach significantly reduces development cycle time and tooling risk.
