We are a custom precision plastic injection molder - and so much more.
A Trusted Partner For Injection Molding that Must Perform
At Four Process, we believe reliability is earned. As a third-generation, Missouri-based manufacturer, we partner closely with engineering and operations teams to deliver precision molded components — on schedule and without unnecessary friction. We don’t just run parts. We step in, solve problems, manage details, and own outcomes. With molding, secondary operations, assembly, and storage under one roof, we simplify your supply chain while protecting performance.
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Problem Solver
Manufacturing rarely goes exactly to plan. What matters is how it’s handled. We approach challenges with structure, urgency, and clear communication — identifying root causes, stabilizing production, and keeping your program moving forward.
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Turnkey Solutions
We integrate injection molding, secondary operations, sourced components, packaging, and inventory management into one structured program. With fewer moving parts and one accountable partner, your products move from production to delivery without unnecessary complexity.
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50 Year of Experience
For five decades, our business has been built on trust, accountability, and long-term relationships. That continuity matters — it means stable leadership, practical decision-making, and a partner who plans for the long haul, not just the next order.
Custom Injection Molding
We manufacture custom plastic components where performance, precision, and timing matter. Operating 85 to 500 ton presses with automation and clean room capability, our processes are structured for repeatability and control. Tight tolerances, disciplined quality checks, and steady production management ensure your parts are delivered on schedule — and built to perform.
Inventory Management
Reliable production extends beyond molding. We manage component sourcing, specialized packaging requirements, and customized inventory programs designed to align with your demand cycles. With organized warehousing and disciplined inventory control, we help prevent shortages, reduce disruptions, and support predictable fulfillment.
Secondary Operations
We provide integrated secondary operations to deliver finished, ready-to-ship components. Our capabilities include sonic welding, adhesive and solvent bonding, and assembly — all managed under structured quality controls.
