Carbon-Filled PTFE Bush — why this filler for this component
Carbon-filled PTFE is the bearing grade to reach for when the bush runs wet. Water and steam service is where carbon filling earns its place — the compound holds up in conditions that would soften an unfilled bush and would slowly corrode a bronze-filled one.
Where Carbon-Filled PTFE Bush is used
Against a bronze-filled bush
carbon survives water and steam where bronze corrodes, and adds conductivity bronze cannot match for static control. Bronze still carries more load and sheds more heat, so on dry high-PV duty the bronze grade remains the stronger part.
In wet service the bore wears steadily rather than seizing. Because the compound conducts heat, sudden failure is uncommon — measured bore checks at service intervals give reliable warning.
Key properties
Compound
Carbon-filled PTFE, typically 25% carbon
Duty
wet and steam-service bearings, anti-static requirements
How it behaves here
Carbon raises compressive strength so the bore holds its dimension under load, and conducts frictional heat out of the contact. It also makes the bush electrically conductive, which matters wherever static charge must not build on a rotating shaft — a real consideration in solvent handling and powder plant.
Where it does not belong
Carbon is attacked by strong oxidising media, and the compound is no longer as chemically inert as unfilled PTFE. It is also darker and will mark light-coloured product, so it is a poor choice in food or cosmetic contact.
Specifications
| Property | Value |
|---|---|
| Compound | Carbon-filled PTFE, typically 25% carbon |
| Duty | Wet, steam and anti-static bearing service |
| Inner Diameter | To drawing — commonly 5 mm to 300 mm |
| Counterface | Ground steel; stainless in wet service |
| Governing factor | Wet-service stability and static dissipation |
| Not suitable for | Strong oxidisers; food or light-coloured product contact |
Manufacturing process
Compression moulded from 25% carbon compound, sintered, then machined to your drawing. Filled compounds need higher compaction pressure than unfilled PTFE to reach full density through the wall.
Material selection notes
Carbon raises compressive strength so the bore holds its dimension under load, and conducts frictional heat out of the contact. It also makes the bush electrically conductive, which matters wherever static charge must not build on a rotating shaft — a real consideration in solvent handling and powder plant.
How to specify your order
Against a bronze-filled bush: carbon survives water and steam where bronze corrodes, and adds conductivity bronze cannot match for static control. Bronze still carries more load and sheds more heat, so on dry high-PV duty the bronze grade remains the stronger part.
Quality checks and inspection
Dimensions are verified on CMM against your drawing. Filler content and sintered density are checked per ASTM D792, with tensile and elongation per ASTM D4894. A mill test certificate stating the lot, filler content and measured values ships with the order.
Ordering and export documentation
Set clearance for the hot, wet condition. A bush that will run submerged should be fitted with the swelling behaviour of the housing in mind as well as the polymer, because a metal housing and a PTFE bush move at very different rates.
Export packing and lead time
HEMSUN is a DGFT IEC registered exporter (Government of India). Commercial invoice, packing list and certificate of origin accompany international despatch.
Storage and handling
In wet service the bore wears steadily rather than seizing. Because the compound conducts heat, sudden failure is uncommon — measured bore checks at service intervals give reliable warning.
Compliance & Standards
HEMSUN is a DGFT IEC registered exporter (Government of India). Filler content and sintered density are verified per ASTM D792 on each batch, with tensile and elongation checked per ASTM D4894.
Frequently Asked Questions
What Carbon-Filled PTFE Bush options does HEMSUN manufacture?
Carbon-filled PTFE is the bearing grade to reach for when the bush runs wet. Water and steam service is where carbon filling earns its place — the compound holds up in conditions that would soften an unfilled bush and w…
Can you supply Carbon-Filled PTFE Bush for OEM and export orders?
Yes. We support prototype lots, recurring OEM programmes, and export packing with material certificates and dimensional inspection reports on request. Typical RFQ response is within one business day when drawings are complete.
How do I request a quote for Carbon-Filled PTFE Bush?
Send material grade, dimensions or drawing, quantity, application media, and operating temperature/pressure via https://hemsun.com/contact. Our engineering team confirms manufacturability, lead time, and pricing.
