PBI CNC Machining Polybenzimidazole Parts Manufacturer
Precision CNC machining of PBI (Polybenzimidazole, Celazole) custom parts — prototypes, low-volume production, and repeat orders. China-based manufacturer with global export capability.
Why Choose PBI (Polybenzimidazole)
One of the highest-performance thermoplastics for machined parts where heat, wear, and dimensional stability are critical.
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Extreme heat resistance
Continuous use in high-temperature environments; very high glass transition temperature.
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Outstanding dimensional stability
Low thermal expansion and low creep, enabling tight-tolerance parts.
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Excellent wear and friction behavior
Suitable for bearings, bushings, slides, wear strips.
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Inherently flame-resistant
Low smoke generation, very low outgassing — ideal for vacuum and cleanroom applications.
What We Manufacture in PBI
Semiconductor, industrial, aerospace, medical, and automation components machined from PBI with tight tolerances.
Semiconductor & Electronics
Wafer-handling fingers, nest fixtures, insulators, vacuum-compatible components, carrier and alignment parts.
Industrial Equipment
High-temp wear plates, guides, bushings, thrust washers, collars, sleeves.
Aerospace & Defense
Thermal barriers, electrical insulators, high-temp structural spacers.
Medical & Laboratory
Sterilization-resistant instrument components, hot-zone fixtures.
Pumps, Valves & Chemical
Back-up rings, seals, valve seats, isolation parts.
Automation & Robotics
Low-friction slides, pick-and-place grippers, jigs, fixtures.
Have drawings, 3D models, or sample parts? We turn them into consistent PBI components — from prototype through production.
Submit Your RFQOur PBI Machining Capabilities
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CNC Milling
3–5 axis, precision contouring, pockets, slots, complex profiles.
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CNC Turning
Tight concentricity bushings, rings, sleeves, threaded features.
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Drilling, Tapping, Threading
UN/Metric threads, NPT, custom forms. Counterbores, keyways, grooves, deburring.
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Secondary Services
Part marking (engraving/laser), sub-assembly, custom packaging.
Size Envelope & Lead Times
Milling
Up to 800 x 500 x 400 mm (larger on request)
Turning
Up to Ø300 mm x 400 mm length (larger on request)
Prototypes
~5–10 working days after confirmation
Small to Mid-Volume
~2–4 weeks depending on complexity and material availability
Shipping
Global shipping with export-ready packaging
Tolerances & Surface Finish
We focus on dimensional accuracy and stability for high-performance applications.
Standard Tolerances
- ±0.05 mm for most features
- Tight tolerance (small/critical): ±0.01–0.02 mm after DFM confirmation
- Flatness/parallelism/perpendicularity controlled per drawing
Surface Finish & Features
- Typically Ra 0.8–3.2 μm for machined faces in PBI
- Precision reaming or boring for bearing fits
- We review your drawing to recommend realistic tolerances balancing function, cost, and lead time
Design & Machining Notes for PBI
To improve manufacturability and performance of your PBI parts.
Add relief radii in internal corners
≥0.5–1.0 mm if possible to reduce stress risers. Edge treatment: specify chamfers 0.2–0.5 mm or small radii to mitigate chipping.
Wall thickness and thread considerations
Avoid very thin walls over long spans; reinforce with ribs or fillets.
Consider thread reliefs and generous lead-ins; use inserts where high load or frequent assembly is expected.
Holes, deep pockets, and stress management
Design chip evacuation paths; consider stepped depths for deep pockets.
Pre/post-machining thermal conditioning (annealing) can improve stability on tight-tolerance parts.
Parts are machined and measured in controlled conditions for best dimensional control.
We provide DFM feedback before production to optimize your PBI part.
PBI vs. Other High-Temp Plastics
Quick comparison to help you choose the right material.
| Property | PBI | PEEK | PAI | PI |
|---|---|---|---|---|
| Max continuous temp | ~400°C+ | ~250°C | ~280°C | ~300°C |
| Tensile strength | High at temp | Very high | High | High |
| Wear resistance | Excellent | Excellent | Good | Good |
| Moisture absorption | Very low | Low | Moderate | Low |
| Relative cost | Highest | Moderate | High | High |
Unsure which material fits your application? Our team can recommend based on temperature, chemicals, wear, insulation, and cost targets.
Our Process
From RFQ to delivery — a streamlined workflow designed for precision and communication.
Send RFQ
2D drawing, 3D model, material/grade, quantity, tolerances, application notes.
Feasibility & DFM
Manufacturability review, tolerance strategy, material confirmation.
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