MoS₂-Filled PTFE Bush — why this filler for this component
Molybdenum disulphide is specified for a bush where the chemistry must stay close to unfilled PTFE but the running surface needs to be harder and slipperier than virgin material. Because MoS₂ is used at around 5%, the compound behaves chemically much like plain PTFE while gaining a tougher bearing face.
Where MoS₂-Filled PTFE Bush is used
Against a graphite-filled bush
MoS₂ gives a harder running surface at very low fill, whereas graphite gives lower friction in sustained dry running but a softer face. Against glass-filled: MoS₂ keeps far more of PTFE’s chemical breadth but will not resist creep the way glass does.
Wear is gradual and predictable. Because load capacity is limited, a bush running near its PV limit will show accelerating bore loss rather than a steady rate — that acceleration is the signal the duty has outgrown the grade.
Key properties
Compound
MoS₂-Filled PTFE, typically around 5% molybdenum disulphide
How it works here
MoS₂ is a solid lubricant that also hardens the surface layer. In a bush that shows up mainly during bedding-in: the bore takes its running form quickly and with less initial wear than unfilled PTFE, then settles at a lower friction coefficient than a glass- or bronze-filled bush would give.
Where it does not belong
The gain is modest on its own. MoS₂ is a surface-behaviour filler, not a structural one, so it does not lift load capacity anywhere near bronze or glass. Where the governing problem is sustained heavy load or creep, this is the wrong grade and a structural filler is the correct answer.
Specifications
| Property | Value |
|---|---|
| Compound | MoS₂-filled PTFE, typically around 5% molybdenum disulphide |
| Duty | Light to moderate radial load, dry running |
| Inner Diameter | To drawing — commonly 5 mm to 300 mm |
| Counterface | Ground steel; tolerant of moderate finishes |
| Governing factor | Surface hardness and bedding-in behaviour |
| Not suitable for | Sustained heavy load — specify a structural filler instead |
Manufacturing process
Compression moulded from around 5% molybdenum disulphide compound, sintered, then machined to your drawing. Filled compounds need higher compaction pressure than unfilled PTFE to reach full density through the section.
Material selection notes
MoS₂ is a solid lubricant that also hardens the surface layer. In a bush that shows up mainly during bedding-in: the bore takes its running form quickly and with less initial wear than unfilled PTFE, then settles at a lower friction coefficient than a glass- or bronze-filled bush would give.
How to specify your order
Against a graphite-filled bush: MoS₂ gives a harder running surface at very low fill, whereas graphite gives lower friction in sustained dry running but a softer face. Against glass-filled: MoS₂ keeps far more of PTFE’s chemical breadth but will not resist creep the way glass does.
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
Standard PTFE fitting practice applies — set clearance hot, not cold. Because the compound is close to virgin PTFE in stiffness, it is more forgiving of a slightly imperfect counterface than a glass-filled bush would be.
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
Wear is gradual and predictable. Because load capacity is limited, a bush running near its PV limit will show accelerating bore loss rather than a steady rate — that acceleration is the signal the duty has outgrown the grade.
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 MoS₂-Filled PTFE Bush options does HEMSUN manufacture?
Molybdenum disulphide is specified for a bush where the chemistry must stay close to unfilled PTFE but the running surface needs to be harder and slipperier than virgin material. Because MoS₂ is used at around 5%, the c…
Can you supply MoS₂-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 MoS₂-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.
