<img height="1" width="1" style="display:none;" src="https://www.facebook.com/tr?id=350476566337084&amp;ev=PageView&amp;noscript=1">

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...

All White Papers

Deep Dives

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

All Pillar Pages

More Resources

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

Education Overview


TriStar Plastics Corp. Webstore

Customer Portal

TriStar Plastics Corp. Customer Portal
Portal Features
Request Portal Authorization Code

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.

Let's Go Paperless...

To save time, paper & postage please sign up for paperless invoicing and payments.

Contact Us

Go here to request a quote or for general questions (document requests, billing inquiries, etc.).


Ask the Expert

Have a material or application question for our engineering team? Want to send us a file for review? Go here.


Let's Go Paperless

In an effort to save time, paper and postage please sign up for our paperless invoicing and payments.


Meldin® Grades Comparison | Chemical Compatibility


Use the Meldin® grades comparison chart to determine which material will work best for your application. Click on the linked grade name at the top of each column to read more about a specific material and let us know if you have any questions.

The chemical compatibility chart (in tab 2) outlines general chemical resistance for Meldin® 7000 series grades.

Meldin® Grades Material Name 7001 7021 7022 7211 7003
Color Gold Black Black Black Black
Characteristics Key highlights Thermal stability, high strength, dielectric insulator, minimal outgassing in vacuum, ductile, cryo to 600°F continuous. Very low friction and best wear properties for seals and bearings, thrust washers, piston rings. Excellent strength at high temps. Best temperature stability and lowest thermal expansion rate of all Meldin® grades. Excellent high temperature structural option for metals. Excellent bearing grade up to 300°F, k factor drops above that and 7021 is better wearing option above 300°F. Very low friction. Best for service in vacuum and in extreme dry conditions. Commonly used as seals, seats, bearings, in space applications.
Composition & Manufacturing Methods Base Resin Polyimide (PI)
Fillers Unfilled Base Resin 15% Graphite 40% Graphite 15% Graphite, 10% PTFE 15% Molybdenum Disulfide
Shape Availability Rod, sheet, finished parts
Up to 37" rod, 12 x 12 sheets
Tubes, Discs, Blocks
MFG Method DF x x x x x
MFG Method HCM x x x x x
MFG Method Isostatic Molding x x x x x
Performance Max Load
Testing in progress Testing in progress Testing in progress Testing in progress Testing in progress
Max Speed
"V" (fpm)
Testing in progress Testing in progress Testing in progress Testing in progress Testing in progress
Max "PV"
(Mpa * m/s)
Testing in progress Testing in progress Testing in progress Testing in progress Testing in progress
Mechanical Tensile Strength (psi) 12500 9500 8000 7500 9200
Elongation (%) 8.0 4.7 3.0 4.0 5.5
Flexural Strength (psi) 15800 15800 13000 11800 13000
Flexural Modulus (psi x 105) 4.6 5.3 7.7 5.0 4.6
Compressive Modulus (psi x 105) 3.8 4.5 4.8 3.5 3.6
Thermal Max Use Temp 600°F* 600°F* 600°F* 600°F* 600°F*
Tg (Glass Transition Temp.) Has no Tg** Has no Tg** Has no Tg** Has no Tg** Has no Tg**
Thermal Conductivity (BTU in/hr ft2 °F) 2.4 5.0 - 5.2 -
CTE – 73 to 500°F (in/in/°F) 2.7 2.2 1.4 2.4 -
Electrical Dielectric Strength (V/mil) 580 280 - - -
Surface Resistivity (Ohm-Sq) 1015 - 1016 108 - 109 - - -
Other Specific Gravity 1.43 1.51 1.65 1.53 1.61
Hardness (Rockwell E) 40-55 25-40 5-20 1-15 -
Water absorption 24hr / 48hr (%) 0.23 / 0.64 0.50 / 0.10 - - -

* Intermittent exposure to 900ºF

** Meldin® 7000 has no softening point. TGA tests show it burns off less than 5% by weight up to temperatures of 1112ºF.

The list above is only a partial list of available Meldin® materials.

PV data may be exceeded based on specific application requirements. Ask to speak to a TriStar Application Engineer.


Meldin® 7001

Meldin® 7021

Meldin® 7022

Meldin® 7211

Acetic Acid (10%) C C C C
M-Cresol B* B* B* B*
o-Dichlorobenzene A A A A
Diethyl Ether A A A A
Ethanol A A A A
Hydraulic Fluid, Polyphosphate Ester A A A A
Hydrochloric Acid (37% @RT) B B B B
Hydrochloric Acid (5%, 100C) C C C C
JP-4 Jet Fuel A A A A
Jet Engine Oils (MIL L78086, T2) A A A A
Mineral Oil A A A A
Nitric Acid (70%) B-C B-C B-C B-C
Nitrobenzene B* B* B* B*
Nitrogen Tetroxide B B B B
Perchloroethylene A A A A
Silicone Fluid A A A A
Sodium Hydroxide (5%) C C C C
Tricresyl Phosphate B B B B
Toluene A A A A

A - Highly Resistant
B - Moderately Resistant
C - Reduced Resistance