TH Plastics Inc. is celebrating over 50 years as a global leader in thermoplastics engineering & manufacturing

At TH Plastics we pride ourselves on building strong and lasting customer relationships built on expertise, quality, and responsiveness.




Continual Improvement

We will exceed customers’ expectations in supplier performance through a commitment of continuous improvement and employee enrichment. Family owned and privately operated since 1974.


TH Plastics provides superior customer support and is a solutions center for all your thermoplastic needs.

Products & Capabilities

Follow Us

TH Plastics is a custom injection molder with locations in Mendon, Michigan, Bowling Green, Ohio, Findlay, Ohio, and Tiffin, Ohio.

Contact Sales for information about how we can solve your design needs & discuss how TH Plastics can be an integral part of your supply chain.

Contact the TH Plastics Human Resources Department for the latest employment opportunities on our growing team.

Welcome to the TH Plastics Employee Self-Service System and downloadable forms.


Mendon, Michigan

Contact Info:

Mendon Administration
106 E Main Street
Mendon, MI 49072
p  (269) 496-8495
x 1110
f  (269)  496-4675

Manufacturing Plant
501 TH Drive
Mendon, MI 49072

Manufacturing Plant


Contact Info:

Findlay Administration
101 Bentley Court

Findlay, Ohio 45840
p  (419) 425-5825
x 2276
f  (419)  425-3203

Manufacturing Plant

Bowling Green, Ohio

Contact Info:

Bowling Green Administration
843 Miller Drive

Bowling Green, Ohio 43402
p  (419) 352-2770
x 4420
f   (419)-352-2799

Manufacturing Plant


Contact Info:

Tiffin Administration
680 Tyber Road

Tiffin, Ohio 44883
p  (567) 268-4200
x 5520
f  (419)  715-4113