PI / Polyimide CNC Machining
PlasticCNCPro is a Dongguan, China–based manufacturer specializing in precision CNC machining of plastic and engineering polymer parts. We help global OEMs, equipment builders, and engineering teams turn drawings and models into reliable polyimide components—from quick prototypes to repeat production.
Polyimide (PI) is a high-performance polymer valued for its dimensional stability at elevated temperatures, excellent electrical insulation, and strong mechanical performance. Our engineering-focused approach, material know-how, and export-ready processes make us a dependable partner for PI / polyimide CNC machining.
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Why Choose Polyimide (PI)
High Temperature Capability
Continuous service in high-heat environments with excellent thermal stability.
Excellent Electrical Insulation
Superior dielectric properties, low outgassing, ideal for semiconductor and vacuum tools.
Strength & Creep Resistance
Good mechanical strength even at elevated temperatures, low creep under load.
Dimensional Stability
Low thermal expansion relative to many plastics, stable in precision applications.
Good Wear Characteristics
Especially in filled grades with graphite, PTFE, or glass fiber modifiers.
Chemical Resistance
Resistant to many solvents and process media (application-specific validation advised).
Polyimide Materials We Machine
We support machining of industry-standard polyimide rod, plate, and tube stock. Options include unfilled PI, filled grades, and brand-specified stock upon request.
Unfilled PI
General high-temperature insulation and structural components.
Filled Grades
Graphite, PTFE, glass fiber, or friction/wear modifiers for improved tribological performance.
Brand-Specified Stock
DuPont Vespel, Saint-Gobain Meldin, or customer-supplied PI materials.
Notes:
- For tight-tolerance parts, we may recommend pre-annealed stock or controlled thermal conditioning.
- We provide material selection support based on your heat, wear, electrical, chemical, and cost requirements.
Core Machining Capabilities for PI
CNC Milling
2.5D and 3D contours, pockets, thin webs, precision faces.
CNC Turning
Bushings, rings, spacers, stepped shafts, sealing hardware.
Drilling & Tapping
Metric/imperial threading, counterbores, countersinks, and custom hole patterns.
Slotting & Grooving
Keyways, reliefs, and custom features with clean edges.
Precision Finishing
Deburring, edge radiusing, polishing of functional surfaces.
Marking & ID
Custom identification per customer requirements.
Typical Tolerances and Finishes
We focus on consistent dimensional control, clean edges, and surface quality appropriate to the function.
Dimensional Tolerances
Typically ±0.05 mm; down to ±0.02 mm on features when geometry, material grade, and part size permit.
Flatness & Parallelism
Controlled by setup, fixturing, and material conditioning; limits proposed per design review.
Surface Finish
Typical machined finishes around Ra 0.8–1.6 μm; finer finishes achievable with suitable tooling.
Burr Control
Process-driven deburring and edge management to protect insulation and sealing functions.
Design and DFM Guidance for Polyimide
- Provide generous internal radii where possible; avoid sharp internal corners.
- Keep thin walls and webs practical; consult us for wall limits based on part size and grade.
- Use relief grooves or lead-ins for threads; consider inserts for repeated assembly.
- Specify critical features and datum scheme clearly to ensure robust measurement.
- Indicate operating temperature range, mating materials, and functional surfaces.
- Allow for stress-relief or conditioning steps where tight tolerances are required.
- For vacuum/semiconductor parts, specify outgassing, cleanliness, and packaging needs.
- We review your design and provide machining recommendations before production.
Where PI / Polyimide Parts Are Used
Semiconductor & Vacuum Tools
Insulators, shields, spacers, nests, wafer handling components.
Aerospace & Defense
High-temperature bushings, backup rings, thermal isolation parts.
Medical & Laboratory
Precision insulators, fixtures, non-metal contact components.
Industrial Automation
Wear strips, guides, low-friction components for robotics and machinery.
Electrical & Electronics
Dielectric barriers, terminal blocks, sensor housings.
Pumps, Valves & Fluid Systems
High-temp seals, seats, thrust washers (application-specific).
Our Working Process
Send us your drawing, 3D file, sample, or project requirements.
We review the design, material, tolerances, and manufacturability.
You receive a quotation and production recommendation.
Samples or production parts are manufactured and inspected.
Parts are packed & shipped worldwide.
Frequently Asked Questions
Can you machine Kapton film?
We focus on CNC machining of solid PI rod/plate/tube stock. Film handling and conversion are not part of our typical process scope.
Can you meet tight tolerances on PI?
Yes, we routinely machine tight tolerances on PI. For very tight limits, we may recommend specific grades, annealed stock, or controlled conditioning steps.
Do you provide material certificates?
Material certificates are provided when available from the stock supplier, or we can machine customer-supplied material to ensure exact brand/grade control.
What's the typical lead time?
Prototypes often ship within 7–14 days after order confirmation, depending on material availability and complexity. Lead times for repeat orders are quoted case-by-case.
Contact and Next Steps
PlasticCNCPro's mission is to make custom plastic CNC machining simpler, more dependable, and more accessible for global buyers