Brass-Filled PTFE Tube

A brass-filled PTFE tube is PTFE compounded with brass powder filler. The addition of brass dramatically improves compressive strength, wear resistance, thermal conductivity, and dimensional stability while preserving PTFE's inherent chemical resistance and low friction characteristics.

This creates a material that can withstand heavy loads, dissipate frictional heat effectively, and provide long service life in sliding applications.

Specification: Density 3.5-3.8 g/cm³ (depending on brass content), tensile strength ≥14.5 MPa, hardness Shore D 60-66, continuous service temperature -200°C to +260°C. Brass content typically ranges from 40% to 60% depending on grade and application requirements.

Virgin PTFE → Chemical resistance + low friction, but poor wear and load capacity

Brass-Filled PTFE → Mechanical strength + wear resistance + heat dissipation + chemical resistance

Selection rule: High load, high wear, or high-speed sliding applications requiring chemical resistance → Brass-Filled PTFE Tube

Why Brass-Filled PTFE?

Brass Filler

Strength, Wear Resistance, and Thermal Management

Brass powder (typically 40-60% by weight) provides the following critical enhancements to PTFE:

① Superior Wear Resistance

Brass particles create a hard, wear-resistant surface that significantly outlasts virgin PTFE in sliding and abrasive applications

Reduces wear rates by up to several hundred times compared to unfilled PTFE

Ideal for bearings, bushings, piston rings, and other sliding components

② High Load-Bearing Capacity

Brass filler provides excellent compressive strength, supporting heavy mechanical loads without deformation

Dramatically reduces creep and cold flow under sustained pressure

Enables PTFE to be used in high-pressure applications where virgin PTFE would fail

③ Excellent Thermal Conductivity

Brass powder dissipates frictional heat effectively, preventing heat buildup that can cause seal damage or premature failure

Critical for high-speed and high-load applications where heat generation is significant

Extends component life by maintaining lower operating temperatures

④ Dimensional Stability

Brass filler minimizes creep relaxation and cold flow, maintaining dimensional tolerances over time

Ensures consistent clearance and sealing performance in dynamic applications

Reduces maintenance frequency and extends service intervals

⑤ Enhanced Hardness

Shore D hardness 60-66, significantly harder than virgin PTFE (Shore D 50-55)

Improves resistance to deformation under load

Provides better resistance to particulate abrasion and surface damage

⑥ Good Electrical Conductivity

Unlike bronze, brass offers better electrical conductivity

Suitable for applications requiring static charge dissipation or grounding

Can be used in certain electrical and electronic applications where PTFE's insulating properties are not required

Synergistic Effect

The brass filler creates a composite structure where the PTFE matrix provides chemical resistance and low friction, while the brass particles provide mechanical strength, wear resistance, and thermal management.

This synergy results in a material that delivers performance unmatched by either component alone.

Brass Content Options

Technical Specifications

Material Data

Applicable Standards

Available Forms

Why Choose Brass-Filled PTFE Tube?

1. Exceptional Wear Resistance

Brass-filled PTFE offers among the highest wear resistance of all PTFE compounds. The brass particles create a hard, durable surface that significantly extends component life in heavy-duty applications.

In abrasive conditions, it outperforms glass-filled and graphite-filled PTFE grades.

2. High Load-Carrying Capacity

With 40-60% brass content, the material provides exceptional compressive strength and load capacity. It supports high mechanical loads without deformation, ideal for bearings, piston rings, and heavy machinery components operating under high pressure.

3. Excellent Thermal Conductivity

Brass powder provides superior thermal conductivity, dissipating frictional heat from sliding surfaces. This prevents heat buildup that can cause seal damage, shaft scoring, or premature failure, critical for high-speed and high-load applications.

4. Reduced Creep and Cold Flow

Brass filler significantly improves dimensional stability by reducing creep relaxation and cold flow under sustained load. Maintains clearance and performance over time, reducing maintenance frequency and extending service life.

5. Good Chemical Resistance

While brass filler limits chemical resistance compared to virgin PTFE, the material still offers good resistance to oils, hydrocarbons, mild chemicals, water, steam, and non-corrosive industrial fluids.

6. Cost-Effective Alternative to Bronze

Brass-filled PTFE offers similar mechanical performance to bronze-filled PTFE at a generally lower cost, making it an attractive option for budget-conscious applications without compromising on wear resistance and load capacity.

Comparison: Brass-Filled vs. Other Filled PTFE Tubes

Quick Selection Guide

Applications

Chemical Compatibility: Important Consideration

⚠️ Brass-filled PTFE has reduced chemical resistance compared to virgin PTFE. The brass (copper-zinc alloy) filler is susceptible to attack by certain chemicals.

Suitable Media

Brass-filled PTFE is best used in applications where chemical resistance is NOT the primary requirement, mechanical performance, wear resistance, and heat dissipation are the priorities.

Compatible media include:

Oils and lubricants

Hydrocarbons and fuels

Mild chemicals (dilute solutions, non-oxidizing)

Water (including seawater)

Steam (under appropriate conditions)

Non-corrosive industrial fluids

Hydraulic fluids

Media to Avoid

Strong mineral acids (sulfuric, nitric, hydrochloric, hydrofluoric) — causes dezincification of brass

Strong alkalis (sodium hydroxide, potassium hydroxide at high concentrations)

Oxidizing agents

Corrosive chemical process streams

Quality Assurance

100% Virgin PTFE Resin: no regrind, no recycled material

Premium Brass Powder: high-quality copper-zinc alloy powder with consistent particle size

Uniform Filler Dispersion: consistent properties throughout the material

Precision Manufacturing: extruded and molded processes for consistent dimensions and surface finish

Full Traceability: material certificates available on request

Custom Sizes: custom diameters, lengths, and brass content ratios available

Quality Testing: each batch tested for density, hardness, tensile strength, and dimensional accuracy

Lead Time: standard sizes in stock (24-48 hours); custom sizes 5-15 days

FAQ

Q: Brass-filled PTFE vs. bronze-filled PTFE, which is better?

A: Both offer excellent mechanical performance, but there are important differences:

Choose Brass-Filled when: You need excellent wear resistance and thermal conductivity at a lower cost. Good for general heavy-duty applications where cost is a factor.

Choose Bronze-Filled when: You need the absolute maximum wear resistance and are willing to pay a premium. Often specified for aerospace (SAE AMS3678) and extreme applications.

Quick Rule: Extreme performance + higher budget → Bronze. Excellent performance + cost-effective → Brass.

Q: What is the difference between 40% and 60% brass-filled PTFE?

A: The choice depends on your application requirements:

Choose 40% Brass for a balance of properties and flexibility. Choose 60% Brass for maximum load capacity, wear resistance, and heat dissipation in extreme heavy-load applications.

Q: What is the maximum continuous service temperature for brass-filled PTFE?

A: Brass-filled PTFE has a continuous service temperature range of -200°C to +260°C, the same as virgin PTFE. The brass filler improves heat dissipation (removing heat from sliding interfaces) but does NOT increase the maximum temperature limit, that is determined by the PTFE matrix.

For applications exceeding 260°C, consider PPL Filled PTFE (up to 300°C).

Q: What are the limitations of brass-filled PTFE tube?

A:

Chemical: ❌ Not suitable for acids or strong alkalis, brass corrodes (dezincification). Use glass-filled or virgin PTFE for chemical service.

Temperature: Continuous -200°C to +260°C, not for >260°C continuous operation.

Friction: Higher friction coefficient than virgin PTFE (0.12-0.20 vs 0.04-0.10), MoS₂ addition can help.

Electrical: Brass is moderately conductive, not for high-voltage insulation applications, but suitable for anti-static uses.

Color: Brass filler gives the material a golden-yellow appearance, may be a consideration for cosmetic requirements.

Ideal for: High-load, high-wear mechanical applications with non-corrosive media (oils, hydrocarbons, water, mild chemicals), where cost-effectiveness is important.

Avoid: Corrosive chemicals (acids/alkalis), continuous temperatures above 260°C, high-voltage electrical insulation.