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Bearing Materials

TriStar offers a wide range of bearing materials that are ideal for non-lubricated, high-load applications.

Saint Gobain Materials

TriStar is the exclusive partner of Saint Gobain for Rulon materials in North America. 

Materials and Fabrication

Our capabilities include component design, material selection, prototype, production, and manufacturing.

Materials Database

Use our interactive database to search for and compare over 450 materials.


Surface Modification

Learn how our Enhanced Materials Divison (EMD) modifies existing materials to meet specific needs.



Since 1982 we have been combining the skills of TriStar’s engineering team, our extensive product line, and our deep understanding of a broad range of industries to bring you solutions to your most challenging engineering needs.

Problems / Solutions

Explore the common causes of bearing failure and learn how advanced polymer and composite bearings can address them.

Application Case Studies

Enhanced Materials Division (EMD)

EMD  positions TriStar Plastics as the leading resource to solve your demanding engineering material challenges.

Enhanced Materials Division (EMD)


View our library of engineering worksheets — the quickest way to communicate your project specs — or reach out to our engineering team.


Here are a few of our most popular online engineering tools - including our PV calc and material database (450+ materials).


Learn about our quality program and view our current ISO cert.


Technical Library

Our collection of case studies, product specs, brochures and other key technical documents.

Free White Papers

Our library of free-to-download white papers focus on industry-based solutions, specific materials, bearing design, and more...

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Deep Dives

These pillar pages provide in-depth information on bearings and problem/solutions for specific industires.

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More Resources

Our popular resources, including our monthly newsletters, blog, and our video library.

Education Overview

About Us

TriStar Plastics Corp. provides engineering, custom fabrication and manufacturing of high-performance plastics and self-lubricating bearing materials. 


We're dedicated to building a company where opportunities exist for talented people to achieve their maximum potential.

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Meldin® 4000 Series | PAI Resin Base

Meldin® 4000 Family


Meldin® 4000 PAI (polyamide-imide) based compounds are manufactured by injection molding with a very limited number of shapes available for prototyping activity.

All 4000 series compounds have common properties that make them suitable replacements for metal components. They are stiff and retain high mechanical strength at elevated temperatures; they are very durable even in harsh applications in regards to wear; and they are chemically compatible with all automotive fluids (fuels and oils).

Meldin® 4000 Series Grades


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Grade Description

Meldin® 4210

This bearing formulation has a very low coefficient of friction and is wear resistant. Meldin® 4210 is an excellent option for high PV thrust washers and seal rings.

Meldin® 4310

An excellent multi-purpose, wear resistant material that is suitable for bearing, thrust washer, and piston ring applications. It also has a low coefficient of thermal expansion and excellent impact resistance.

Meldin® 4320

MELDIN® 4320 components provide good strength and stiffness in addition to excellent fatigue and creep resistance. These components also feature excellent wear resistance and are suitable for thrust washer applications in hydraulic pumps and high PV automotive applications.

Meldin® 4330

This grade supports tight tolerances thanks to it’s very low CoTE and high mechanical and fatigue strength across broad operating temperatures.