AI Visibility Index: Plastic Extrusion & Thermoforming in Illinois

When a buyer asks an AI assistant for a plastic extrusion & thermoforming supplier in Illinois, these are the companies that get named. This is what we found when the cell was last measured.

241 companies tracked
Last measured September 30, 2026
Next measurement October 30, 2026

Look up your company Get your monthly report

The headline numbers

Never named by AI

222 of 241

companies never appeared in a single buying question

They were asked the same 5 buying questions as everyone else in this cell and were not named once.

19 named at least once
222 never named

Not sure whether you are one of them?Check your domain

Cell average: 0.41of 15
Across all 241 tracked companies.
Top ten average: 8.1of 15
The ten most visible companies in the cell.

A company's score is how many of the 15 measured answers named it.

The top ten in Illinois

These are the companies AI assistants named most often when Illinois buyers went looking for a supplier in this category.

Top 10 most AI-visible Plastic Extrusion & Thermoforming companies in Illinois, measured September 30, 2026
Rank	Company	Location	AI visibility
1	Greenwood Plastics IndustriesEvery answer 20 employeesDanville, Illinois 2 name variants Greenwood Plastics Industriesmost common14 Greenwood Plastics Industries (GPI)1	Danville, Illinois	15 of 15 answers
2	E & C Custom Plastic Inc 30 employeesAddison, Illinois	Addison, Illinois	12 of 15 answers
3	Polytec Plastics Inc 40 employeesSt. Charles, Illinois 2 name variants Polytec Plastics Inc.most common9 Polytec Plastics1	St. Charles, Illinois	10 of 15 answers
4	CBM Plastics, Inc. 10 employeesArthur, Illinois	Arthur, Illinois	8 of 15 answers
5	Plastic Designs, Inc 35 employeesPaxton, Illinois 4 name variants Plastic Designs, Inc. (PDI)most common3 PDI (Plastic Designs, Inc.)2 Plastic Designs, Inc.1 PDI – Paxton, IL1	Paxton, Illinois	7 of 15 answers
6	Sandee Manufacturing Co 80 employeesFranklin Park, Illinois 3 name variants Sandee Manufacturing (Sandee Plastics)most common4 Sandee Plastics (Sandee Manufacturing)2 Sandee Manufacturing1	Franklin Park, Illinois	7 of 15 answers
7	Dordan Mfg 50 employeesWoodstock, Illinois	Woodstock, Illinois	6 of 15 answers
8	Profile Plastics, Inc. 75 employeesLake Bluff, Illinois	Lake Bluff, Illinois	6 of 15 answers
9	Inplex Custom Extruders Illinois	Illinois	6 of 15 answers
10	Custom Plastics, Inc. 220 employeesElk Grove Village, Illinois	Elk Grove Village, Illinois	4 of 15 answers

22 more companies were named at least once. Companies outside the top ten are counted in the averages but not named here.

Also named, based in another state

AI assistants named these companies too, but MacRAE'S lists them in a different state, not Illinois. They belong to that state's ranking, not this one.

Company	State	Mentions
Hill Plastics	Texas	4 of 15
Pro-Form	Texas	2 of 15
Joslyn Manufacturing	Ohio	1 of 15
Profile Manufacturing Inc.	Michigan	1 of 15

One of these yours?

A complete Blue Book listing is one of the sources assistants read in this category. Confirming your details is free.

Get your monthly report

The five questions we asked

Every company in this cell is measured on the same questions, written the way a buyer would type them. That is what makes the ranking a comparison rather than a collection of anecdotes.

1“Best plastic extrusion and thermoforming companies in Illinois”
2“Who supplies custom extruded and thermoformed plastic profiles in Illinois”
3“I need a Illinois plastic extrusion and thermoforming partner for a new consumer product housing program, who should I talk to”
4“Top plastic extrusion and thermoforming suppliers in Illinois for OEM product development buyers”
5“Which Illinois plastic extrusion and thermoforming companies can handle tight-tolerance co-extruded sheet and deep-draw forming”
6“List 20 plastic extrusion and thermoforming companies in Illinois with their specialties.”the roster question

Each question is asked more than once, which is why a company's score is out of 15 answers rather than out of the number of questions.

Where AI drew its answers from

These are the sources the answers in this cell leaned on most, ranked by how many of the named companies each one stands behind.

thomasnet.comDirectory
5 companies
pdipaxton.com
4 companies
proformsite.com
3 companies
sandeeplastics.com
3 companies
gmtplastics.com
2 companies
mercuryplasticsinc.com
2 companies
polytecplastics.com
2 companies
formcoplastics.com
2 companies
gpi-plastics.com
2 companies
inplexllc.com
2 companies
reddit.comDirectory
2 companies
cbmplasticsusa.com
1 company

42 sources were cited across this cell's answers from 34 domains. A directory page often stands behind several companies at once; a company's own site usually stands behind one.

Illinois in context

Illinois ranks 16th of 26 measured states in this category. Each bar is the share of that state's tracked companies that AI assistants named at least once; across every measured state in this category the share is 7%.

Illinois (this report)Other measured statesCategory average (7%)

Look up a company

Enter a domain or a company name to see whether it is tracked in this cell, and whether the answers named it. This is a lookup against a measurement already taken, so it is instant.

Try gpi-plastics.com or any other domain

The public Index publishes one measurement per cell. A monthly report covers your own company:

Every question it was named on
Every question it was not
What moved

Your own position is only ever shown to you.