PTFE Piston Rings & Guide Rings: Custom Engineered for High-Wear Applications

Product Overview & Precision Manufacturing

Our PTFE piston rings and support rings are precision machined from high-quality pure or filled PTFE compounds, designed for non-lubricated (oil-free) and dry gas reciprocating compressors, hydraulic cylinders, and pneumatic actuators. These rings provide low-friction dynamic sealing and piston guidance, eliminating the need for liquid lubrication while preventing metal-to-metal contact between the piston and cylinder wall.

Available in continuous, straight-cut (butt), angle-cut (45°), step-cut, and lap-joint configurations, our PTFE piston rings deliver optimal blow-by control, dimensional stability, and long operational life under harsh mechanical and thermal stresses.

Key Performance Advantages

• Dry / Non-Lubricated Operation: Ultra-low coefficient of friction allows smooth reciprocating motion in totally oil-free compressor systems, preserving process gas purity.

• Exceptional Wear Resistance: Specially formulated filled compounds (Bronze, Carbon, Graphite, Glass Fiber) dramatically reduce wear rates and extend maintenance intervals.

• Broad Temperature Range: Performs reliably across continuous temperatures from cryogenic -200°C (-328°F) up to +260°C (+500°F).

• Universal Chemical Compatibility: Impervious to aggressive chemical gases, refrigerants, and corrosive process vapors across pH 0–14.

• Custom Joint Designs: Flexible joint geometries (butt, angle, step, lap) ensure tight dynamic sealing and simplified installation onto solid or split pistons.

Material Grade Options

• Virgin PTFE: Best for food-grade, pharmaceutical, cryogenic, or light-duty chemical applications requiring maximum purity.

• Bronze-Filled PTFE (40%–60% Bronze): Offers maximum compressive strength, excellent thermal conductivity, and superior wear resistance in heavy-duty gas compressors.

• Carbon / Graphite-Filled PTFE: Ideal for non-lubricated gas service, high speed, and moist gas environments with low friction requirements.

• Glass Fiber-Filled PTFE: High wear resistance and chemical stability for abrasive gas or pneumatic applications.

Primary Applications

• Reciprocating Gas Compressors: Air, nitrogen, hydrogen, oxygen, carbon dioxide, and CNG compressors operating without oil lubrication.

• Cryogenic Equipment: Expansion turbines and cold-end pumps handling liquefied natural gas (LNG), liquid nitrogen, or oxygen.

• Hydraulic & Pneumatic Actuators: High-duty industrial cylinders requiring smooth stick-slip-free motion and chemical resistance.

• Medical & Breathing Air Systems: Clean, oil-free medical air supply pumps and oxygen concentrator compressors.

Quality Assurance, Inspection & Packaging

• Precision Dimensional Inspection: 100% measurement of outer diameter (OD), inner diameter (ID), axial width, radial wall thickness, and joint gap tolerances using digital calipers and height gauges.

• Surface & Finish Quality Control: Rigorous visual and optical checks ensure smooth sealing surfaces free of flash, micro-cracks, or machining burrs.

• Individual Protective Packaging: Sealed in individual anti-static poly bags and partitioned cardboard boxes to protect ring geometry and sealing edges during shipping.

Contact our engineering team with your cylinder bore dimensions, pressure differential, and gas media to receive technical recommendations and a competitive quotation.