Custom Engineering & Material Blending
Custom Piston Cups: Material Compounding & Sizing
Custom blend PTFE compounds that are CNC-machined and precision formed for oil-free air compressors, medical oxygen concentrators, and vacuum pumps. Built to meet exact cylinder bore tolerances, operating temperatures, and extended duty cycles.
Request Custom Specs →Custom PTFE Compounding
Off-the-shelf seals wear prematurely under continuous dry-running friction and heat. We compound virgin PTFE with targeted fillers to match your exact pressure, thermal, and lifecycle targets.
Carbon / Graphite-Filled PTFE
Formulated for continuous dry-running operation with a low coefficient of friction and rapid heat dissipation away from the cylinder wall.
Glass-Filled + MoS₂ PTFE
Reinforced with milled glass fibers and molybdenum disulfide to resist cold flow (creep) under load while maintaining dry-run lubricity.
Bronze-Filled PTFE
Delivers high compressive strength, superior thermal conductivity, and resistance to gap extrusion under heavy mechanical loads.
Polyimide / PEEK & Proprietary Blends
Custom polymer formulations engineered to minimize aluminum or coated sleeve wear while achieving 10,000+ hour service intervals.
Custom Sizes, Profiles & Tolerances
Whether you are reverse-engineering a legacy compressor or prototyping a new pump assembly, we form and machine cups to exact geometric specifications.
- Outer Diameters (OD) Custom tooling and CNC sizing from 0.75" (19 mm) up to 3.5" (88.9 mm) to match metric or imperial cylinder bores.
- Wall Thickness & Tolerances Precision-controlled thin-wall to heavy-duty cross sections held to tight tolerances for consistent sealing and zero blow-by.
- Lip Profiles Straight-wall, flared, or tapered sealing lips engineered specifically for wobbling-piston and guided-piston compressor strokes.
- Mounting Base Configurations Flat-bottom, recessed retainer seats, multi-hole bolt patterns, or custom center bores with low-MOQ prototyping through full OEM runs.
Request a Custom Piston Cup Quote
Share your operating conditions or dimensions below. Our engineering team reviews all custom compound and sizing requests within 1 business day.
What to Include
Don't have a full CAD drawing yet? Share any available details and we will help specify the right blend and geometry:
- Cylinder bore ID & stroke length
- Operating PSI & continuous temperature
- Compressor make/model or OEM part #
- Prototype vs. annual production volume
team.mack@mackusa.com
