Glass-Filled PTFE Piston Ring — why this filler for this component
Glass-filled rings suit compressors that run continuously rather than intermittently. The problem on a long duty cycle is not peak pressure but slow deformation — the ring gradually loses its section and its seal, and glass fibre reinforcement is what prevents that.
Where Glass-Filled PTFE Piston Ring is used
Against a bronze-filled ring
glass retains chemical resistance for aggressive gas and resists creep on long runs, but bronze handles higher peak pressure and moves heat better. Against graphite: glass holds section far better but will wear the bore where graphite protects it.
Blow-by rises slowly and predictably across a long interval, which is the behaviour that makes this grade suit continuous duty. Bore inspection at ring changes matters more here than with a softer grade.
Key properties
Compound
Glass-filled PTFE, typically 15% or 25% glass fibre
Duty
continuous-running compressors, chemically aggressive gas
How it behaves here
The fibres resist cold flow under the sustained pressure a continuously running ring experiences, so ring section and gap stay closer to the fitted dimensions across a long service interval. The compound also keeps most of PTFE’s chemical resistance, which matters when the gas is not simply air.
Where it does not belong
Glass is abrasive to the cylinder wall. On a soft, plated or worn bore a glass-filled ring will accelerate bore wear, and friction is higher than a graphite-filled ring so more heat is generated at the contact.
Specifications
| Property | Value |
|---|---|
| Compound | Glass-filled PTFE, typically 15% or 25% glass fibre |
| Duty | Continuous-running oil-free compression; aggressive gas |
| Form supplied | Machined to cylinder drawing |
| Governing factor | Section retention against creep over long duty cycles |
| Counterface | Hardened steel bore; avoid soft or plated cylinders |
| Not suitable for | Worn or refurbished soft bores — specify graphite-filled |
Manufacturing process
Compression moulded from 15% or 25% glass compound, sintered, then machined to the cylinder drawing.
Material selection notes
The fibres resist cold flow under the sustained pressure a continuously running ring experiences, so ring section and gap stay closer to the fitted dimensions across a long service interval. The compound also keeps most of PTFE’s chemical resistance, which matters when the gas is not simply air.
How to specify your order
Against a bronze-filled ring: glass retains chemical resistance for aggressive gas and resists creep on long runs, but bronze handles higher peak pressure and moves heat better. Against graphite: glass holds section far better but will wear the bore where graphite protects it.
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
Confirm the bore material and condition before fitting. Ring gap is set hot. On a compressor being returned to service after a bore refurbishment, check the surface hardness rather than assuming it.
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
Blow-by rises slowly and predictably across a long interval, which is the behaviour that makes this grade suit continuous duty. Bore inspection at ring changes matters more here than with a softer 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 Glass-Filled PTFE Piston Ring options does HEMSUN manufacture?
Glass-filled rings suit compressors that run continuously rather than intermittently. The problem on a long duty cycle is not peak pressure but slow deformation — the ring gradually loses its section and its seal, and g…
Can you supply Glass-Filled PTFE Piston Ring 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 Glass-Filled PTFE Piston Ring?
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.
