Engineering Plastic Manufacturing Services

Great Plastics supports custom engineering plastic parts made from PEEK, PPS, PI, PAI and PEI.

We help evaluate material requirements, part geometry, manufacturing routes and inspection needs to align each project with its functional and production requirements.

What We Manufacture

Custom Engineering Plastic Parts

We produce parts and stock in the form that matches how each project is used and built — from made-to-drawing components to cut-to-size blanks.
Precision CNC machined PEEK plastic manifold plate with threaded inserts, custom high temperature plastic part

Precision Machined Components

Tight-tolerance parts such as bushings, manifolds, valve seats and motion components, produced by CNC milling and turning from sheet, rod and tube stock.

Precision CNC machining, injection molding and engineering plastic components tailored to your design.

Custom Engineering Plastic Parts

Made-to-order parts produced through machining, molding, 3D printing and fabrication, matched to the application, geometry and production stage.

Cut-to-Size Plastic Stock

Sheets, rods, tubes and blanks cut to requested dimensions for machining, fabrication and production use, including blanks for downstream work.

Manufacturing Routes

Choose the Right Manufacturing Route

The right manufacturing route depends on part geometry, material requirements, production stage and inspection needs.

CNC Plastic Machining

Best for: precision parts, prototypes, bushings, fixtures and replacement components.

When to explore: start here when the part has defined geometry, critical dimensions, or must be made from stock shapes without tooling.

View Route

All-Electric Injection Molding with Robotic Automated Part Extraction

Injection Molding

Best for: repeat demand after resin, DFM and tooling assumptions are stable.

When to explore: consider it for recurring quantities once the design and material are established.

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Industrial SLS 3D printer, laser sintering polymer powder for complex low-volume plastic components

3D Printing

Best for: functional prototypes and selected high-performance printed parts.

When to explore: choose it for fast iteration, complex geometry and parts suited to additive processes.

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Custom Cutting

Best for: cut-to-size sheets, rods, tubes and blanks for downstream work.

When to explore: use it when you need stock cut to size, or blanks for machining and fabrication.

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Carbon-filled PEEK 3D printed aerospace assembly.

Rapid Manufacturing

Best for: pilot, bridge and low-volume parts before production route decisions.

When to explore: use it to validate design and function before committing to a production route.

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compare

Not sure which manufacturing process to use?

Most engineers start with material and volume. Here’s a quick comparison.

Service Lead Times Tolerances Max Part Size
Injection Molding 1–20 days ±0.003 in. 18.9 in. × 29.6 in. × 8 in.
CNC Machining 1–7 days ±0.002 in. 22 in. × 14 in. × 3.75 in.
3D Printing 1–7 days ±0.002 in. 29 in. × 25 in. × 21 in.

Five High-Performance Plastics

Material Selection Starts With the Application

Great Plastics focuses on PEEK, PPS, PI, PAI and PEI. The appropriate grade and manufacturing route depend on operating conditions, part geometry and functional requirements.

PEEK

For parts requiring heat, wear and chemical resistance under operating‑condition demands.

PPS

For parts requiring chemical resistance, low moisture uptake and consistent dimensional stability.

PI

For parts requiring extreme‑temperature performance, wear resistance and reliable electrical insulation.

PEI

For parts requiring continuous heat resistance, structural stiffness and stable electrical insulation.

PAI

For precision parts requiring high stiffness, wear resistance and tight dimensional control.

Engineering Review

Review the Requirements Before Production

Great Plastics focuses on PEEK, PPS, PI, PAI and PEI. The appropriate grade and manufacturing route depend on operating conditions, part geometry and functional requirements.

Operating Conditions & Material
Geometry & Critical Dimensions
Route & Material Form
Tolerances, Finish & Inspection

For wall thickness, holes, threads, fits and surface finish, see the Design Guide. Open the Design Guide→

How a Project Moves Forward

From Requirements to a Manufacturing Plan

A typical project conversation moves through the steps below before production. Timing and scope are confirmed for each part individually.

1

Understand the Application

Clarify the functional requirements and operating conditions the part must meet.

2

Review Material & Design

Consider the material, part geometry and critical features together.

3

Evaluate the Route

Identify a suitable manufacturing route for the geometry and production stage.

4

Clarify Quote & Inspection

Confirm quotation details, tolerances, finish and inspection requirements.

Buyer questions

Frequently Asked Questions

Start with the material selection route, then send the operating conditions and any drawing or part photos for review. The application details decide which material and process deserve the first look.

Yes. Send the application conditions, drawing and quantity so material, product form and manufacturing route can be reviewed together rather than in isolation.

A 2D drawing, 3D model, sample photo, material target, quantity and operating requirements are the most useful inputs for a first review.

Share the target material or grade, operating conditions, part geometry and quantity. The suitability of a route is confirmed during the review, not assumed from a catalog.

Discuss Your Next Engineering Plastic Part

Share your drawing, target material, operating conditions and quantity requirements.

Great Plastics can review the available information and help identify a suitable next step for your part.

Drawing or CAD file
Target material and grade
Operating conditions
Quantity and project stage
Critical tolerances and inspection needs