Custom Injection Molding 2


  • Shot size from 2 oz. to 580 lb.
  • Void free wall sections in excess of 5 inches
  • Economical production runs – 50 to 50,000 pieces per year
  • Complex configurations
  • Lightweight parts – 80% lighter than most metals
  • Corrosion resistance – Plastics can operate in severe chemical environments
  • Abrasion resistance – Plastics offer superior abrasion resistance

With the ability to injection mold shot sizes up to 580 lb. and wall thicknesses in excess of 5 inches, EnviroTech Custom Injection Molders is anything but typical. With more than 50 years of experience we have become the world leader in large, thick wall plastic parts. Time and time again our customers have turned to us for their Custom Injection Molding needs because other suppliers claimed their products were impossible to manufacture. From polycarbonate fighter jet canopies with perfect optics to void-free 200 lb. pipe fittings, the possibilities are almost endless.


Injection molding is a common way to manufacture plastic parts. Parts manufactured using injection molding vary in size, shape and complexity. Injection molded plastic parts are used in a variety of situations from engine parts to medical equipment. The functionality and use of an injection molded part determines the type of raw plastic material or resin that should be used in the injection process. Plastic is melted in the injection molding machine and then injected into the mold, where it cools and solidifies into the final part. The steps in the molding process can be complex based on the plastic resin used and part complexity.The process cycle for injection molding varies based on the part size and thickness, times may vary from a few seconds to 30 minutes. Since EnviroTech’s proprietary bulk injection molding processes allows us to mold larger parts, the cycle-time tends to be longer.

The main injection molding process steps include clamping the mold shut, injecting the resin into the mold, cooling the molten resin, and ejecting the part. These steps are discussed in detail below: