PTFE Extruded/Molded Rod/Filled Rod

Ⅰ、Features

Diameter 4-9mm rod selection of dispersed polymerization of PTFE resin paste made by extrusion processing; Diameter 10-150mm rods made of PTFE resin suspension made by plunger processing; diameter of 150mm or more by the mold Made of processing. For filled PTFE rods,can be filled glassfiber,graphite,carbon with different percent,10%,15%,25% and so on. 

Ⅱ、Types and Specifications

Ⅲ、Main Properties

Note: When the diameter of rod is larger than 16mm,only test apparent density.

Ⅳ、Applications

Electrical insulation parts, seal pads, anti-sticking materials

Graphite-Filled PTFE Rod Introduction

Graphite-filled PTFE rod is a composite engineering plastic rod material made from polytetrafluoroethylene (PTFE) as the base matrix, modified by adding a certain proportion of graphite particles. It retains the excellent corrosion resistance, high/low temperature resistance, and low friction coefficient of PTFE, while significantly improving wear resistance, thermal conductivity, and self-lubricating properties through graphite filling, making it suitable for harsher industrial environments.

Main Characteristics

· Corrosion Resistance: Resists strong acids, strong alkalis, and organic solvents (except molten alkali metals and fluorine gas).

· Temperature Range: -200℃ ~ +260℃ for long-term use, can withstand up to 300℃ short-term.

· Self-Lubrication: The layered structure of graphite provides an extremely low friction coefficient (0.10~0.15), suitable for oil-free lubrication conditions.

· Enhanced Wear Resistance: Graphite filling reduces the cold flow tendency of PTFE, extending component life.

· Thermal/Electrical Conductivity: Graphite improves the thermal insulation properties of PTFE, giving it moderate thermal conductivity and anti-static capability.

Typical Applications

· Sealing Field: Packing rings, gaskets, valve seats for chemical pumps and valves.

· Wear-Resistant Components: Bearings, guides, bushings, and other oil-free lubricated moving parts.

· Anti-Static Scenarios: Conductive insulation components for semiconductor and medical equipment.

Advantages Compared to Pure PTFE

After graphite filling, the material exhibits a more stable friction coefficient, 3~5 times improved wear resistance, but reduced insulation properties. The color is typically black or dark gray, making it easy to identify.

This material can be machined into custom parts through turning and cutting, widely used in chemical, mechanical, electronic, and other industries for high-performance requirement scenarios.

Basic Physical Properties

Item	Parameter Value	Test Standard
Density	2.15-2.30 g/cm³	ASTM D792
Color	Black / Dark Gray	Visual
Water Absorption (24h)	< 0.01%	ASTM D570
Melting Point	327℃	DSC Method

Graphite-Filled PTFE Rod vs Pure PTFE Rod Performance Comparison

Performance Indicator	Graphite-Filled PTFE Rod	Pure PTFE Rod
Friction Coefficient	0.10~0.15(Dynamic, Lower)	0.05~0.10 (Initial, Prone to Wear)
Wear Resistance	High (Graphite reduces wear)	Low (Prone to cold flow deformation)
Service Temperature	-200℃ ~ +260℃(Short-term 300℃）	-200℃ ~ +260℃
Thermal Conductivity	0.35 W/m·K (Better than Pure PTFE)	0.25 W/m·K
Electrical Conductivity	Moderately Conductive (Anti-static)	Completely Insulating
Chemical Resistance	Resists Strong Acids, Alkalis, Solvents	Same as Left
Color	Black / Dark Gray	White
Typical Filling Ratio	Graphite 5%~25%	No Filler

Graphite-Filled PTFE Rod Typical Specifications

Parameter	Standard Range	Remarks
Diameter	5mm ~ 200mm	Custom Sizes Supported
Length	500mm ~ 1000mm (Standard)	Long rods or continuous coils customizable
Density	2.1~2.3 g/cm³	Slightly higher than pure PTFE (2.1 g/cm³)
Tensile Strength	15~25 MPa	~20% higher than pure PTFE
Elongation at Break	150%~300%	Depends on graphite ratio
Applicable Standards	ASTM D1710, GB/T 13404	RoHS and other certifications available

Innovative Data Comparison Table

Comparison Item	Traditional PTFE Rod	Graphite-Filled PTFE Rod	Improvement Effect	Technical Breakthrough Point
Friction Coefficient	0.05-0.10	0.10-0.15	30% Lower Dynamic Friction	Graphite layered structure forms self-lubricating film
Wear Life	500 hours	2000 hours	4x Life Improvement	Graphite filling inhibits PTFE cold flow
Thermal Conductivity (W/m·K)	0.25	0.35	40% Improvement	Graphite builds thermal conduction network
PV Limit Value	0.5 MPa·m/s	1.2 MPa·m/s	140% Load Capacity Improvement	Composite synergistic effect
Anti-static Performance	Insulator	10⁶-10⁸ Ω	Achieves Anti-static Function	Graphite conductive pathway design
Processability	Prone to Cold Flow	Improved Dimensional Stability	50% Machining Precision Improvement	Graphite reinforcement skeleton effect
Chemical Resistance	Excellent	Excellent	Improved HF Acid Resistance	Graphite-PTFE interface optimization

Innovative Performance Parameters Table

Test Item	Test Standard	Innovative Index	Traditional Index	Improvement幅度
Wear Rate (mm³/N·m)	ASTM D3702	1.2×10⁻⁶	5.8×10⁻⁶	79% Reduction
Heat Deflection Temp. (°C)	ASTM D648	120	80	50% Increase
Compression Set (%)	ASTM D395	15	35	57%Improvement
Volume Resistivity (Ω·cm)	ASTM D257	10⁶	>10¹⁴	Electrostatic Discharge Functionality
Limit PV Value (MPa·m/s)	Industry Standard	1.2	0.5	140% Increase

Innovative Application Scenarios Table

Application Field	Traditional Solution Pain Points	Innovative Solution	Benefit Improvement
Chemical Seals	Prone to wear and leakage	Graphite self-lubrication + wear resistance	Maintenance cycle extended 3x
Food Machinery	Requires periodic lubrication	Oil-free self-lubricating design	Meets food-grade requirements
Semiconductor Equipment	Static accumulation risk	Controllable anti-static performance	Yield rate increased by 15%
Aerospace	Deformation under extreme temperatures	Enhanced dimensional stability	Reliability improved by 50%

International General Standards

Standard System	Standard Number	Certification Content	Applicable Field
ASTM	ASTM D1710	General Specification for PTFE Rods	General Industry
ASTM	ASTM D4745	Standard for Graphite-Filled PTFE Molded Parts	Seals / Bearings
ISO	ISO 13000	Plastics - Requirements for PTFE Semi-Finished Products	International Trade
EN	EN ISO 10993-5	Biocompatibility Testing	Medical / Food Equipment

Chinese National Standards

Standard Type	Standard Number	Certification Name	Special Requirements
GB	GB/T 13404	Technical Conditions for Plastic PTFE Rods	Dimensional Tolerances + Physical Properties
GB	GB 4806.6	Food Contact Material Safety Standard	Heavy Metal Migration Testing
HG	HG/T 2902	Standard for PTFE Products in Chemical Industry	Chemical Resistance Verification

Selection Considerations

· Conductivity Requirements: After graphite filling, it may not be suitable for high insulation scenarios.

· Load Conditions: High loads require use with metal bushings to avoid cold flow.

· Media Compatibility: Confirm specific chemical media (e.g., hydrofluoric acid requires special treatment).