Assembly & Secondary Operations
Value-added assembly and secondary operations including ultrasonic welding, printing, insertion, and sub-assembly for finished plastic components.
Learn moreOne facility for prototype through high volume — tooling, molding, and secondary operations under one roof in Dongguan.

Specifications on a website are commitments about what can actually be delivered. A 50-ton to 800-ton press range, closed-loop control, and in-house tooling are not decorations — together they are what let a program hold tolerance across every shipment for the life of the contract.
The capability pages below describe how each process is run and where it creates value.
Related precision capabilities include precision injection molding, plastic injection mold tooling, and precision plastic components.
Every capability is backed by the same quality system: incoming material verification, first-article inspection, in-process SPC, and final audit against the approved drawing. That is what turns a list of capabilities into a supply relationship you can plan around.
Browse our materials and applications, or request a quote to scope your program.
Each capability is delivered with the documentation and process control the program volume and market require.
Value-added assembly and secondary operations including ultrasonic welding, printing, insertion, and sub-assembly for finished plastic components.
Learn moreCleanroom-compatible injection molding for medical, optical, and electronic parts with controlled handling, packaging, and particulate control.
Learn morePlasticMolder provides custom plastic injection molding services, engineering your parts to drawing with DFM analysis, material selection, in-house tooling, and production molding under one roof.
Learn moreCustom plastic parts manufacturer in Dongguan engineering components to print with insert molding, overmolding, secondary operations and assembly.
Learn moreHigh-volume injection molding with multi-cavity and stack tools, automated cells, and SPC for millions of consistent parts per year.
Learn morePlasticMolder provides insert molding services in China, encapsulating threaded inserts, bushings, contacts, and metal components in thermoplastic on 50T-800T presses for robust one-shot assemblies.
Learn moreCost-effective low volume injection molding from 100 to 100,000 parts, built by a custom injection molding company in Dongguan using soft or pre-hardened tool steel.
Learn moreOEM and ODM plastic parts manufacturer and automotive plastic parts supplier in China for automotive, medical, electronics, EV and industrial brands worldwide.
Learn morePlasticMolder provides overmolding services in China, bonding TPE and elastomers over rigid substrates for soft-touch grips, seals, and ergonomic components on 50T-800T presses.
Learn morePlastic injection mold manufacturer in China: precision mold design and fabrication in P20, 718H, NAK80 and S136 tool steels with hot runner systems and 300,000+ shot guarantees.
Learn morePlasticMolder designs and builds plastic injection mold tooling in China, from prototype to multi-cavity production molds, with CNC, EDM, hot-runner expertise and 15-35 day lead times.
Learn morePlasticMolder provides plastic injection molding services, producing thermoplastic components on 50T-800T presses with tight tolerance control and full-quality documentation for global OEMs.
Learn moreEnd-to-end plastic injection molding services in China covering design support, mold making, molding, assembly and quality inspection from a custom injection molding company in Dongguan.
Learn morePlasticMolder delivers precision injection molding for tight-tolerance plastic components, including connectors, optical, and micro-feature parts held to ±0.01 mm with CMM verification and SPC on 50T-400T presses.
Learn morePrecision plastic components manufacturer in China holding tolerances down to ±0.01 mm, also serving as an automotive plastic parts supplier for high-tolerance applications.
Learn morePrototype injection molding in China with quick-turn tooling and molded prototypes in production-grade resins delivered within 7 to 15 days.
Learn moreRapid and fast injection tooling in aluminum or pre-hardened steel to cut lead time from weeks to days for bridge and pilot production.
Learn moreThin-wall injection molding for lightweight packaging, containers, and electronics with fast cycles, tight walls, and warpage control.
Learn morePlasticMolder provides two-shot injection molding services in China, molding two resins or colors in a single cycle on rotary-platen presses for durable hard-soft and multi-color components.
Learn moreWe provide cleanroom injection molding, high-volume multi-cavity production, rapid and bridge tooling, thin-wall molding, and integrated assembly and secondary operations. Tooling is built and maintained in-house so lead time and quality stay controlled.
Yes. The same plant runs prototype and bridge tooling, then transitions to hardened steel multi-cavity production. Because tooling and molding share a building, the critical path from design release to first article is compressed.
We operate cleanroom-compatible molding for medical and high-purity programs, with process control, material traceability, and validation aligned to ISO 13485 and customer-specific requirements.
Tell us the volume, tolerance, and any special process needs. We will propose a capability mix and return a quote within 24 hours.