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

PTFE Molded Rod Product Introduction

PTFE molded rods are engineering plastic rods made from polytetrafluoroethylene (PTFE) raw material through traditional compression molding and sintering processes. As a classic form of PTFE products, they hold an important position in the industrial field due to their mature manufacturing process and stable performance.

Core Advantages

· Stable and Reliable Process: Uses pre-pressing molding + high-temperature sintering process, ensuring high product consistency.

· Comprehensive Specification Coverage: Diameters from 1mm to 500mm can be produced, meeting diverse needs.

· Flexible and Diverse Modifications: Can add various fillers like glass fiber, graphite, copper powder, etc., for customized performance.

· Outstanding Cost-Effectiveness: Production cost is 15-20% lower than the extrusion process, suitable for bulk purchases.

Key Performance Indicators

· Temperature Range: -200℃ ~ +260℃ (short-term 300℃)

· Chemical Inertness: Resistant to strong acids, strong alkalis, and organic solvents (except molten alkali metals)

· Insulation Performance: Volume Resistivity > 10¹⁶ Ω·cm (Pure PTFE)

· Friction Coefficient: 0.05-0.10 (Dry friction conditions)

Typical Application Fields

· Sealing Components: Flange gaskets, valve packing rings

· Wear-Resistant Parts: Bearing bushings, guideway sliders

· Electrical Insulation: High-voltage switch insulation parts

· Corrosion Protection Linings: Protective linings for chemical equipment

· Laboratory Equipment: Corrosion-resistant containers, experimental apparatus

Product Specification Parameters

· Standard Diameter: 1-500mm (Custom sizes supported)

· Standard Length: ≤ 1200mm (Up to 1500mm with special processes)

· Tolerance Control: Diameter tolerance ±0.2mm (Precision grade ±0.1mm)

· Color Options: Standard white, customizable black, gray, etc.

Process Characteristics Description

1. Manufacturing Flow:

   · Raw Material Pretreatment → Compression Molding → Sintering Curing → Machining (Optional)

2. Surface Condition:

   · Natural sintered surface roughness Ra 3.2-6.3 μm

   · Can achieve Ra 0.8 μm after precision machining (requires additional processing)

3. Modification Options:

   · Glass Fiber Reinforced: Improves mechanical strength (up to 32 MPa)

   · Graphite Filled: Enhances thermal conductivity/self-lubrication

   · Carbon Fiber: Improves wear resistance/anti-creep performance

Selection Guide

· Recommended Application Scenarios:

  · ✅ Small/Medium-sized components (Diameter ≤ 300mm)

  · ✅ Complex shaped parts machining

  · ✅ Conventional corrosion/insulation requirements

· Scenarios for Cautious Use:

  · ❌ Ultra-long continuous components (> 1.5 meters)

  · ❌ Ultra-high precision sealing (< 0.05mm tolerance)

Typical Technical Parameters

Performance Indicator	Parameter Range	Test Standard
Density	2.10-2.30 g/cm³	ASTM D792
Tensile Strength	14-28 MPa	ASTM D638
Elongation at Break	200-400%	ASTM D638
Heat Deflection Temperature	55℃ (0.45MPa)	ASTM D648
ASTM D648	40-60 kV/mm	ASTM D149

Comparison with Extruded Rods

Comparison Item	Molded Rod	Extruded Rod
Production Speed	Slow (0.2-0.5 m/h)	Fast (2-5 m/min)
Internal Density	Lower (Porosity 1-2%)	High (Porosity < 0.5%)
Dimensional Accuracy	± 0.2 mm	± 0.1 mm
Suitable Scenarios	Short parts / Shaped parts	Long dimensions / Thin-walled parts

Basic Physical Property Data

Performance Indicator	Parameter Value	Test Standard	Remarks
Material Composition	Pure PTFE or Modified PTFE	-	Optional fillers: Graphite/Glass Fiber, etc.
Density	2.10-2.30 g/cm³	ASTM D792	Filled types have slightly higher density
Color	White / Modified Color	Visual	Standard white, customizable gray/black
Water Absorption (24h)	< 0.01%	ASTM D570	Almost non-absorbent

Mechanical Properties

Parameter	Pure PTFE Molded Rod	20% Glass Fiber Reinforced	15% Graphite Filled
Tensile Strength	14-21 MPa	25-32 MPa	18-24 MPa
Compressive Strength (10% deformation)	12-18 MPa	35-45 MPa	28-35 MPa
Flexural Modulus	350-500 MPa	800-1000 MPa	800-1000 MPa
Impact Strength	16-22 kJ/m²	16-22 kJ/m²	10-15 kJ/m²

Product Specification Parameters

Parameter	Standard Range	Customizable Range
Diameter	1-500 mm	0.5-600 mm
Length	≤ 1200 mm	≤ 1500 mm
Roundness Tolerance	± 0.2 mm	± 0.1 mm
Straightness	1 mm / 100 mm	0.5 mm / 100 mm

Machining Parameters Guide

Process	Recommended Parameter	Precautions
Turning Speed	40-100 m/min	Diamond Tools
Drilling Feed Rate	0.05-0.1 mm/rev	Coolant Required
Surface Roughness Ra	1.6-3.2 μm	Fine turning can achieve 0.8 μm
Bonding Method	Sodium Naphthalenide Treatment	Strength increased 5 times

Certification Standards Comparison

Certification Type	Standard Number	Inspection Focus
General Industrial	GB/T 13404	Physical & Mechanical Properties
Food Grade	FDA 21 CFR 177.1550	Migration Test
Electronics & Electrical	UL 94	Flame Retardancy
EU Environmental	RoHS 2.0	Hazardous Substance Restrictions

Application Selection Reference

Application Scenario	Recommended Type	Alternative Solution
Strong Acid Sealing	Pure PTFE	Graphite Filled
Wear-Resistant Bearings	Wear-Resistant Bearings	Carbon Fiber Filled
Anti-static Components	Graphite Filled	Carbon Black Filled
Food Processing	Food Grade Pure PTFE	-