Custom Plastic Injection Molding Services
Custom plastic injection molding services work best when the supplier understands the part, tool, material, production schedule, and communication needs around the program. As part of E-S Plastics’ broader plastic manufacturing capabilities, we provide molded components, technical input, and production support for manufacturers with recurring production needs, transferred tools, insert-molded parts, larger components, and programs that need more than commodity molding capacity.
We mold a range of part sizes from two Wisconsin facilities, with strong capability in larger molded components, insert-molded parts, and recurring production work that benefits from responsive communication and stable supplier support.
Production Molding Capabilities
We operate out of Waterford and Saukville, Wisconsin, with tool rooms at both locations, ISO 9001:2015 certification, and 24-hour weekday production. This gives you press capacity and production coverage without relying on a single facility.
Our press range supports small, mid-size, and larger molded parts, with horizontal and vertical injection molding capabilities. We have 48 injection molding machines, including presses from 28 to 1,000 tons and vertical presses suited for insert molding work, and can mold parts with a maximum weight of 7 pounds or with a maximum footprint of 24” x 36”.
Industries Served
E-S Plastics supports molding programs for industrial, commercial, and equipment-based applications where part consistency, supplier communication, and production stability are important. Core industries include water treatment, power generation, battery and electrification, industrial machinery, outdoor power equipment, small appliance and vacuum, food service and dispensing equipment, refrigeration, and agricultural applications.
Materials and Program Fit
Material choice affects how a part performs, molds, assembles, and holds up in the field. We work with a broad range of thermoplastic materials, from commodity resins to engineering-grade and higher-performance materials, including resins that require higher-temperature processing. If you already have a material specified, we can review how it fits the tool, part geometry, and production requirements. If you are still evaluating options, we can help narrow the material choices based on strength, cost, appearance, chemical exposure, operating environment, and expected volume.
We are a stronger fit when the program has recurring demand, defined production requirements, and enough annual volume to justify stable molding, inventory planning, and ongoing supplier support. Many of our best-fit programs involve tens of thousands of parts per year, larger molded components, insert molded parts, or existing production work that needs a more responsive molding partner.
Tool Transfer and Reshoring Support
If you are moving molded work back to a U.S.-based supplier or transferring production from another molder, E-S Plastics can help review the program before the move starts. That includes the existing tool, part requirements, material needs, available documentation, and any production or quality expectations that need to be carried over.
Tool transfer and reshoring projects often run into problems when the handoff is incomplete. E-S Plastics’ reshoring support helps manufacturers reduce those unknowns before production restarts, especially when the part is already in use and downtime, quality drift, or supplier disruption would create risk.
Mold Design, Mold Repair, and Tooling Support
Tooling affects part quality, cycle stability, maintenance needs, and long-term production cost. E-S Plastics has tool rooms at both Wisconsin locations and can help evaluate tooling condition, maintain tools used in production, and review mold or part-design questions that affect molding performance.
For new or revised programs, early review can help identify design-for-manufacturing issues before production starts. For existing programs, mold repair and tooling support can help address wear, damage, fit, or reliability concerns that may affect part consistency or delivery.
Secondary and Value-Added Services
When molded parts need post-mold work, we can help reduce extra supplier handoffs by keeping supporting services connected to the molding program. Available secondary and value-added services include hot stamping, pad printing, sonic welding, heat staking, assembly, and robotic adhesion.
Quality and ISO 9001:2015-Certified Production
Reliable delivery and consistent quality make the rest of your operation easier to manage and prevent extra work for your team. E-S Plastics is ISO 9001:2015 certified, which supports documented expectations for production, communication, and quality management across molding programs.
When a program changes, we communicate early and work with you on a plan. That may mean adjusting a delivery expectation, reviewing demand, or helping your team work through an issue before it affects production.
Talk Through Your Injection Molding Program
If you need plastic injection molding services for an existing production part, a tool transfer, or a larger molded component, we can review your project requirements and tell you whether the program fits our equipment, process, and production model. Send us your part details, tooling status, annual volume, material requirements, and production timeline to start the conversation.
Frequently Asked Questions
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E-S Plastics is a strong fit for recurring production programs with defined requirements, stable demand, and parts that benefit from technical review or ongoing supplier communication. Good-fit programs may include larger molded components, insert-molded parts, transferred tools, or production work that needs a more responsive molding partner.
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Many of our best-fit programs involve tens of thousands of parts per year. The right fit depends on the part, tool, material, production schedule, inventory needs, and required level of support.
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E-S Plastics supports a range of part sizes and has press capacity up to 1,000 tons. Parts may have a maximum weight of 7 pounds or a maximum footprint of 24” x 36”.
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Yes. E-S Plastics can review an existing tool, available production history, material requirements, documentation, quality expectations, and launch needs before a transferred or reshored program moves into production.