INJECTION MOLDING | PLASTIC TUBING | PLASTIC SHEET I PLASTIC PROFILES
U.S. Manufacturer of Custom Plastic Extrusions, Tubing, Sheet & Injection Molding. Precision manufacturing for OEMs, Engineers, and Industrial Supply Chains
Located In ST. LOUIS, MISSOURI
Expert Manufacturing Service
Trusted by Industry Leaders for Over 50 Years!
Seiler Plastics is a U.S. manufacturer specializing in custom plastic extrusion, thin/thick-gauge sheet, and injection molding. For over 50 years, we've partnered with customers who need consistent quality, responsive engineering support, and reliable domestic production.
Whether you're launching a new product, qualifying a secondary supplier, or increasing capacity, Seiler Plastics delivers practical manufacturing solutions without unnecessary complexity.
Custom Plastic Extrusion Solutions
With a wide variety of materials and colors, we produce custom extruded plastic profiles, extruded plastic tubing, and extruded plastic sheet to meet the needs of our customers.
Our Blog
WHAT ARE THE ADVANTAGES OF POLYETHYLENE PLASTIC TUBING?
FROM PELLETS TO PIPING: HOW THE EXTRUSION PROCESS WORKS
WHAT IS PLASTIC THERMOFORMING?
THE WHAT, HOW, AND WHY OF RECYCLING POLYETHYLENE
