PAR CNC Machining
Polyarylate precision machined parts for prototypes, low-volume, and repeat production — engineered in China, shipped worldwide.
Get a Quote →What Is PAR (Polyarylate) and When to Use It
PAR is an amorphous, high-performance engineering plastic known for:
- High heat resistance (high glass transition temperature)
- Excellent dimensional stability and low creep
- Good electrical insulation properties
- Transparency and optical clarity (in many grades)
- Low moisture absorption compared with many engineering plastics
Common use cases span precision components for temperature swings, transparent heat-resistant covers, and structural fixtures where stiffness and stability matter. When PC lacks heat stability but PEI/PSU performance is unnecessary, PAR offers an ideal balance.
Why PlasticCNCPro for PAR CNC Machining
Decades of plastic-machining expertise, engineering-first communication, and a global delivery mindset.
Specialized in Plastic Machining
Deep experience with amorphous high-temp polymers — PAR, PEI, PSU/PPSU, PEEK — not just general CNC.
Prototype to Production
One-off validations, repeat batches, spare parts — we scale with your needs without compromising quality.
Engineering Communication
DFM feedback on material, tolerances, and manufacturability — clear, technical, and actionable.
Dimensional Consistency
Process control for thermal expansion and stress management unique to plastics.
Broad Material Access
Standard, glass-fiber–reinforced, flame-retardant, antistatic, and custom grades all supported.
Export-Ready Service
Clear quotations, inspection documentation, and protective packaging for reliable global delivery.
Capabilities for PAR Parts
Machining Operations
- CNC milling, turning, drilling, tapping
- Threading, counterboring, slotting
- Complex 3D geometries, thin walls, tight fits
- Bearing seats, alignment features
- Functional threads in plastic or with inserts
Surface & Finishing
- Fine machining, deburring, edge radiusing
- Polishing / buffing for improved clarity
- Heat-set, ultrasonic, or press-in inserts
Typical Tolerances for PAR
- General: ±0.05–0.10 mm for small to medium features
- Holes, bores, critical fits: down to ±0.02–0.05 mm case-by-case
- Flatness/parallelism: per part size and fixturing strategy
Final tolerances depend on part size, geometry, grade, and inspection method. Share your drawing for a tailored recommendation.
PAR Machining Design Guidelines
1. Manage Heat
Use sharp tools, proper chip evacuation, and air or mist cooling to limit thermal buildup.
2. Thermal Expansion
CTE ~5–7 × 10⁻⁵ /K; design fits and tolerances accordingly.
3. Fillets & Radii
Add internal radii to reduce stress concentration; avoid sharp corners.
4. Wall Thickness
Keep uniform where possible; avoid excessively thin walls unless validated.
5. Threads
For load-bearing/frequent assembly, consider metal inserts rather than direct plastic threads.
6. Stress Relief
Pre- or post-machining annealing may be recommended for tight tolerances or thick sections.
7. Transparency & Finish
For clear parts, discuss polishing strategy early; set realistic expectations for optical surfaces on machined plastics.
PAR Material Options We Support
We source a wide range of PAR grades to match your performance and cost targets.
Transparent Grades
For covers, windows, and housings needing clarity and heat resistance.
Glass-Fiber–Reinforced
Higher stiffness and dimensional stability for demanding structural parts.
Flame-Retardant
UL specifications depend on material; ideal for safety-critical applications.
Antistatic / Conductive
For ESD-critical environments in electronics and handling equipment.
Not sure which grade fits? Our team recommends options based on heat exposure, chemical environment, electrical needs, wear, and cost targets.
Typical PAR Machined Parts & Industries
Where polyarylate precision components deliver critical performance advantages.
Semiconductor & Electronics
Insulation plates, covers, sensor brackets, carriers, alignment fixtures.
Medical & Laboratory
Transparent guards, trays, housings, instrument fixtures (grade-dependent sterilization).
Industrial Automation
Vision windows, pick-and-place nests, guide rails, spacers, wear strips.