Graphite-Filled PTFE Bush — why this filler for this component
A graphite-filled bush is specified when the shaft is the part you must protect. Graphite is the gentlest of the common fillers, so the bush wears in preference to the counterface instead of scoring it — which is the whole point of a plain bearing and something a glass-filled bush actively fails at.
Where Graphite-Filled PTFE Bush is used
Against a glass-filled bush
graphite protects the shaft where glass fibres abrade it, and runs cooler. Glass-filled resists creep far better, so where the load is high and sustained and the shaft is hardened, glass is the correct answer and graphite is not.
The bush wears rather than the shaft, which is the intended behaviour. Expect a shorter bush life than a structural grade would give, and treat that as the cost of protecting a component that is expensive to replace.
Key properties
Compound
Graphite-filled PTFE, typically around 15% graphite
Duty
soft, plated or refurbished shafts; sustained dry running
How it behaves here
Graphite is itself a solid lubricant, so the bore establishes a low-friction running surface quickly and holds it. Friction is the lowest of the filled grades, which means less heat generated in the first place — useful when the housing offers no good heat path.
Where it does not belong
Load capacity and creep resistance are the lowest of the filled grades. Under sustained heavy radial load a graphite-filled bush will close in on the shaft where a bronze- or glass-filled bush would hold its bore.
Specifications
| Property | Value |
|---|---|
| Compound | Graphite-filled PTFE, typically around 15% graphite |
| Duty | Dry running against soft, plated or worn shafts |
| Inner Diameter | To drawing — commonly 5 mm to 300 mm |
| Counterface | Tolerant of soft, plated and refurbished shafts |
| Governing factor | Protecting the counterface; lowest friction of the filled grades |
| Not suitable for | Sustained heavy radial load — specify glass or bronze |
Manufacturing process
Compression moulded from roughly 15% graphite compound, sintered, then machined to your drawing.
Material selection notes
Graphite is itself a solid lubricant, so the bore establishes a low-friction running surface quickly and holds it. Friction is the lowest of the filled grades, which means less heat generated in the first place — useful when the housing offers no good heat path.
How to specify your order
Against a glass-filled bush: graphite protects the shaft where glass fibres abrade it, and runs cooler. Glass-filled resists creep far better, so where the load is high and sustained and the shaft is hardened, glass is the correct answer and graphite is not.
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
This is often the right retrofit choice for older machinery whose shafts are no longer in as-new condition. Clearance is set hot, as with any PTFE compound; graphite is more forgiving of a shaft finish that is less than ideal.
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
The bush wears rather than the shaft, which is the intended behaviour. Expect a shorter bush life than a structural grade would give, and treat that as the cost of protecting a component that is expensive to replace.
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 Graphite-Filled PTFE Bush options does HEMSUN manufacture?
A graphite-filled bush is specified when the shaft is the part you must protect. Graphite is the gentlest of the common fillers, so the bush wears in preference to the counterface instead of scoring it — which is the wh…
Can you supply Graphite-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 Graphite-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.
