PAI Plastic Material

PAI Sheet, Rod, Tube & Custom CNC Parts for OEM Buyers

PAI (polyamide-imide) is a high-performance thermoplastic used for precision components requiring high mechanical strength, wear resistance, creep resistance, and elevated-temperature performance.

Great Plastics supplies PAI sheet, rod, and tube stock, as well as CNC-machined PAI components for demanding mechanical and industrial applications.

±0.01mm

machining tolerance

24h

Rapid response

5-7 days

Fast Delivery

1 piece

MOQ

Overview

PAI Material Selection for Wear Resistance and High Loads

PAI (polyamide-imide) is a high-performance thermoplastic considered for precision components where mechanical strength, wear resistance, creep resistance, and dimensional control are important. Typical applications include bearing surfaces, seals, valve components, bushings, and other high-load machined parts.

PAI is not automatically the best choice for every high-temperature application. Material selection should consider temperature, load, speed, mating surfaces, moisture, tolerances, and cost, with PAI compared against materials such as PEEK, PI, POM, and PTFE where appropriate.

High Mechanical Strength

PAI delivers outstanding stiffness, load capacity and deformation resistance for high-load structural components.

Wear & Creep Resistance

Specified PAI grades suit bearings, bushings and sliding seals after evaluating load, speed and mating materials.

Dimensional Control

Precision-machined PAI parts need strict process control; moisture, stress and temperature influence tight tolerances.

Available Forms

PAI Plastic Forms & Custom Parts

Great Plastics can review available PAI stock shapes and machining options. PAI sheet, rod and tube availability depends on grade, size, color, manufacturing route, and supplier stock.

PAI sheets for CNC machined wear plates, fixtures and precision components.

PAI Sheet

Used for milled wear plates, guides, support blocks, insulating plates, and precision fixture components.

PAI rods for turned bushings, sleeves, spacers and bearing components.

PAI Rod

Used for turned bushings, sleeves, valve seats, bearing components, spacers, and other high-load round parts.

PAI tubes for sleeves, rings and other hollow precision components

PAI Tube

Used for sleeves, rings, and hollow components when the required grade and dimensions are available.

Custom processing of PAI Plastic (Polyamideimide) plastic

Machined Components

For drawing-based CNC machined bearing components, valve components, and precision machinery parts.

Material Selection

PAI Material Grades & Filler Selection

PAI grade selection starts with the application requirements: bearing load, wear, stiffness, temperature, electrical insulation, lubrication, and dimensional stability.

Grade availability varies by supplier, formulation, stock shape, size, and application. Supplier technical data should be checked for the specific grade before material selection.

PAI 4203 Sheet & Rod, Unfilled Polyamide-imide, natural amber color, high impact & electrical insulation for precision structural parts

Unfilled PAI

General-purpose PAI for precision components without reinforcement or bearing additives.

PAI 5530 Sheet & Rod, 30% Glass Fiber Reinforced PAI, high rigidity & low creep for high load structural parts

Glass-Filled PAI

Offers enhanced stiffness and dimensional stability; glass fiber impacts machinability and tool wear.

PAI 5030 Sheet & Rod, Carbon Fiber Filled ESD PAI, anti-static for semiconductor static control components

Carbon-Filled PAI

Features high stiffness, wear resistance and low thermal expansion, selected by mechanical and tribological needs.

PAI 4301 Sheet & Rod, Graphite + PTFE filled PAI, self-lubricating low friction for bearing & seal parts

Wear-Modified / Bearing Grades

Formulated for bushings, thrust washers and sliding parts. Grade selection depends on load, speed, lubrication and temperature.

Performance Data

Key PAI Performance Characteristics

PEI is an amorphous thermoplastic that combines high stiffness, thermal resistance, electrical insulation, and dimensional stability. Performance depends on the specific grade, part geometry, operating conditions, and processing method.

Load & Stiffness

PAI provides high stiffness for loaded bushings, supports, fixtures and other precision components. Actual load capacity depends on the selected grade, part geometry, temperature and loading conditions.

Wear & Friction

Selected PAI grades are used for bushings, thrust washers, valve seats and other sliding components where wear and friction are important. Load, sliding speed, lubrication and mating materials affect material selection.

High-Temperature Stability

PAI retains useful mechanical performance at elevated temperatures. The practical service temperature depends on grade, load, temperature cycling, part geometry and the surrounding environment.

Dimensional Stability

Low thermal expansion can support dimensional control in precision components exposed to temperature changes. Actual dimensional change also depends on grade, temperature range, moisture and component design.

Note: Actual values depend on the specific PAI grade, formulation, processing method, test standard, and application conditions.

Manufacturing Capability

PAI CNC Machining and Custom Components

PAI machining requires control of heat, clamping, cutting conditions, tooling, and dimensional changes during and after machining. Great Plastics can review PAI material requirements and produce custom machined components to drawing.We support prototype development, low-volume production, and OEM manufacturing programs for precision PAI parts.

Before production, we review wall thickness, bore geometry, sharp corners, datum structure, surface finish, machining allowance, and inspection requirements. For close-tolerance parts, conditioning and stress relief may also be considered.

CNC Milling & Turning
Precision Machining
Tight Tolerance Parts
Prototype Production
OEM Volume Manufacturing
Multi-Axis Machining
1–10,000+
Parts per Run
CMM
Inspection
24h
Quote Turnaround

Industry Use Cases

Applications of PAI Plastic Materials

PAI machining requires control of heat, clamping, cutting conditions, tooling, and dimensional changes during and after machining. Great Plastics can review PAI material requirements and produce custom machined components to drawing.

Wafer handling, sockets & vacuum parts with stable dimension, chemical resistance and low contamination.

Semiconductor Equipment

PAI produces wafer handling, wear guide and fixture parts for semiconductor equipment, featuring wear resistance, dimensional stability and thermal performance. RFQ items include temperature, load, cleanliness, grade, geometry and tolerances.

Lightweight structural parts featuring high strength-to-weight ratio, thermal resistance and dimensional stability.

Aerospace Components

PAI aerospace parts deliver high strength-to-weight ratio, stiffness, wear resistance and thermal capability. RFQ considerations cover mechanical load, temperature, weight, wear, dimensional specs and operating environment.

Precision Mechanical Engineering Plastic Parts

Industrial Machinery

PAI wear pads, guides and bushings serve precision machinery under cyclic motion and heavy loads, meeting strict dimensional demands. RFQ factors include load, sliding speed, wear, temperature, lubrication, tolerances and service life.

Material Comparison

PAI vs. Other Engineering Plastics

PAI is not automatically the best choice for every application. Material selection depends on operating temperature, chemical exposure, mechanical load, wear, dimensional requirements, processing needs, and cost.

Comparison Consider PAI When Consider Other Options When
PAI vs. PEEK High load, wear, stiffness, or creep resistance is a priority. PEEK — Chemical resistance, moisture performance, broader material availability, or overall cost is more important.
PAI vs. PI High mechanical load and wear resistance are important in the component. PI — Very high-temperature performance, vacuum service, or dry-running capability is the primary requirement.
PAI vs. POM The application requires higher temperature capability, wear resistance, stiffness, or creep resistance. POM — A lower-cost material with easier machining is sufficient for a moderate-temperature application.
PAI vs. PTFE Higher stiffness, load capacity, wear resistance, and dimensional control are required. PTFE — Very low friction, chemical resistance, or non-stick behavior is more important than stiffness and load capacity.

Related material links: PEEK Plastic Materials | PEI Plastic Materials | PI Plastic Materials

Your Partner

Why Choose Great Plastics？

Great Plastics supports PAI material and grade selection, drawing review, CNC machining, dimensional inspection, custom component production, and technical documentation. Before production, we review the drawing against the selected grade, part geometry, tolerance requirements, machining sequence, and inspection requirements.

01

Material & Grade Review

We evaluate load, temperature, wear and mating materials to select proper PAI grade and stock form.

02

Drawing & Machining Review

We analyze stock size, wall thickness, datums and tolerances to finalize the machining sequence.

03

CNC Machining

PAI parts are CNC milled and turned per drawings, with thermal and clamping controls for tight tolerances.

04

Inspection & Documentation

We deliver dimensional inspection, material certificates and traceability records to meet quality demands.

Request a Quote for Custom PPS Plastic Components

Send your drawings, specifications, or part samples to our engineering team.

We’ll respond with material recommendations, pricing, and lead times within one business day.

Common Questions

Frequently Asked Questions

Quick answers to the questions engineers and procurement teams ask most about PAI materials.

PAI Frequently Asked Questions

These answers provide general guidance on PAI materials, performance, machining, and material selection. Final material selection should be based on the selected grade’s technical data and actual operating conditions.

Why choose PAI for wear applications?

Selected PAI grades offer a combination of wear resistance, low friction, stiffness, and dimensional stability. They are commonly considered for bushings, thrust washers, wear rings, valve seats, and other sliding components. Actual wear performance depends on load, speed, lubrication, mating materials, temperature, and grade.

When should PAI be considered instead of PEEK?

PAI may be considered when high stiffness, wear resistance, creep resistance, and load retention are more important than the broader chemical resistance or material availability of PEEK. The choice depends on the actual temperature, load, wear, chemical exposure, and cost requirements.

How does PAI compare with PI?

PAI is often considered for high-load, wear, and precision mechanical applications, while PI is commonly selected for applications requiring very high-temperature performance, low friction, or specialized electrical and vacuum performance. The specific grade and operating conditions determine the better fit.

Can PAI be CNC machined?

Yes. PAI can be CNC machined into precision components using milling and turning processes. Heat generation, clamping, tooling, machining conditions, stress relief, and dimensional changes should be considered, particularly for close-tolerance parts.

Does PAI absorb moisture?

Yes. PAI absorbs some moisture from the environment, although absorption varies by grade and conditions. Moisture can affect dimensions and machining results, so conditioning should be considered for close-tolerance components.