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PSU CNC Machining

Precision Polysulfone Parts – PlasticCNCPro

PlasticCNCPro is a precision CNC machining manufacturer in Dongguan, China, specializing in custom parts made from engineering plastics and high-performance polymers. We machine PSU (polysulfone) components from prototype quantities to repeat production, with engineering-oriented support, reliable tolerances, and export-focused service for global B2B buyers.

Core Processes

  • CNC Milling
  • CNC Turning
  • Drilling & Tapping
  • Complex Custom Machining

Project Types

  • Functional Prototypes
  • Low-Volume Production
  • Bridge-to-Molding
  • Repeat Batches

Industries Served

  • Medical & Lab Devices
  • Semiconductor & Electronics
  • Fluid Handling & Chemical
  • Automation & Robotics

Quality Focus

  • ISO-equivalent processes
  • Material traceability
  • Export-ready packaging
  • Global B2B service
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Why Choose PSU (Polysulfone)

PSU is an amorphous, high-performance engineering plastic known for its combination of heat resistance, hydrolysis resistance, and dimensional stability. It is typically amber-translucent and offers dependable mechanical performance in demanding environments.

Continuous use temperature

Up to ~150°C, Tg ~185°C

Hydrolysis resistance

Excellent, steam-sterilizable

Dimensional stability

Good creep resistance

Electrical insulation

Good properties

Toughness

Better than many commodity plastics

Chemical resistance

Good vs detergents & cleaners

Not sure which grade fits your application? Our engineering team will help balance heat, chemical, mechanical, electrical, and cost requirements.

PSU CNC machined parts

PSU vs. Alternatives

vs. PPSU Higher impact & chemical resistance; choose PPSU for tough environments & frequent autoclave.
vs. PEI (Ultem) PEI offers higher stiffness/heat; PSU wins on hydrolysis and often cost.
vs. PC PSU superior in heat & hot water resistance; PC higher optical clarity but stress-crack risk.

Our PSU Machining Capabilities

Processes

  • 3- and 4-axis milling, turning, boring, reaming
  • Drilling, tapping/thread milling, counterboring
  • Countersinking, pocketing, slotting
  • Mechanical polishing upon request

Part Size Envelope

  • Milled parts: up to ~600 × 400 × 250 mm typical (larger on request)
  • Turned parts: up to ~Ø300 mm × 400 mm length typical (larger on request)

Typical Tolerances

  • General features: ±0.05–0.10 mm
  • Tight features/turned diameters: up to ±0.02–0.03 mm
  • Flatness, parallelism evaluated per size/thickness; DFM advised

Surface Finish

As-machined, fine milling/turning passes, precision reaming, deburring, edge breaking; mechanical polishing on request

File Formats

STEP/IGES/Parasolid + PDF with complete tolerances, fits, and notes

Lead Times & Quantities

Prototypes 5–12 working days; production 2–5 weeks. 1-off to repeat batches.

PSU Grades and Options

We machine a wide range of PSU stock forms (rod, sheet, tube)

  • Standard PSU (general-purpose)
  • Medical and laboratory grades (USP Class VI capable)
  • FDA-compliant food-contact grades
  • Glass-fiber-reinforced PSU for higher stiffness
  • Wear-modified or lubricated grades
  • Flame-retardant and electrical grades

Related materials if your requirements shift

  • PPSU – higher impact & chemical resistance
  • PESU – higher heat & strength
  • PEI – higher stiffness & temperature
  • PEEK – extreme performance
  • PC – higher optical clarity (moderate heat)

Provide your preferred resin brand/grade (e.g., Udel PSU) when available; otherwise we can recommend commercially available equivalents.

Design and Machining Guidelines for PSU

To improve manufacturability, performance, and cost, we recommend the following practices:

Drying

Pre-dry material prior to machining (typ. 120–130°C for several hours) to reduce moisture-related defects.

Heat/Stress Management

Use sharp carbide tools with positive rake, light-to-moderate depths of cut, and air blast or water-mist cooling. Avoid aggressive petroleum-based coolants.

Stress Relief Annealing

For tight tolerances or thick sections, anneal before and/or after roughing (typ. 150–160°C) then finish-machine.

Radii & Transitions

Add internal corner radii and generous fillets to lower stress concentrations and improve tool access.

Wall Thickness & Ribs

Avoid very thin unsupported walls; use ribs and generous radii to enhance rigidity.

Holes, Bores & Threads

Drill undersize and ream for precision fits. Use sharp taps or thread milling. Consider metal thread inserts for repeated assembly.

Burr Control & Edges

Plastics can form fine burrs; specify edge breaks and critical deburring needs. Chamfered edges reduce notch sensitivity.

Surface Finish

Mechanical polishing is preferred. Solvent or flame polishing is generally not recommended due to stress-crack risk in many environments.

Share your application environment (temperature, sterilization cycles, chemicals, electrical requirements) so we can tune the process and material selection.

Typical PSU Components We Manufacture

Medical & Lab

Manifolds, connectors, housings, valve bodies, instrument handles, sensor blocks

Fluid Handling/Chemical

Pump/valve components, flow cells, fittings, sight windows (amber-translucent), seals and seats

Semiconductor/Electronics

Insulating spacers, carriers, fixtures, test and assembly tooling

Industrial Automation

Wear strips, guides, bushings, custom tooling, jigs and fixtures

RFQ Support

Send Your Drawing for a Quote

Share your 2D drawing, 3D model, material, quantity, tolerance, surface finish, and application details. Our team will review manufacturability and reply with a practical quotation.

Email: info@plasticcncpro.com

Address: 29 Fuxing Road, Dongguan City, Guangdong Province, China