Overmolding Services
Order Overmolding Online
Welcome to UnityManufacture. Our overmolding cells combine a rigid engineering substrate with a soft TPE, TPU or TPV overlay in one moulded part — for grips, seals, anti-vibration mounts, ergonomic handles and soft-touch surfaces. We run two-shot (2K) molding for production volumes and insert overmolding for hand-loaded prototypes and short runs, both with validated chemical bond strength.
What sets UnityManufacture’s overmolding apart?
- State-of-the-Art Technology: Two-shot (2K) molding machines with rotating platens up to 280 t, plus dedicated insert-overmolding cells for short-run and prototype programs.
- Expert Team: Our EDM specialists plan electrode design, wire path and skim-cut strategy up front, because most of the accuracy is decided before the first spark.
- Customized Solutions: Send hardened stock straight from heat treatment and we will finish the critical features, which removes a whole annealing and re-hardening cycle from your schedule.
- Tight Tolerances: Wire EDM holds +/-0.005mm routinely and +/-0.002mm on skim cuts, with surface finishes down to Ra 0.2 micron available on critical faces.
- Quality Assurance: Every EDM part is dimensionally verified against the CAD model with CMM and optical measurement, and first-article reports are available on request.
- Timely Delivery: Parts cut from hardened stock skip the anneal-machine-rehard cycle entirely, which typically takes a week or more off a tooling programme.
Check Out How Unity Manufacture Works In Just A Few Steps
At Unity Manufacture, we’re excited to offer you an easy and efficient way to manufacture CNC parts. Our online platform allows you to upload your CAD files, select your process and material options, and order your parts in one place.
Request quote
First, you need to upload your 2D and 3D files on our Get a Quote page. Alternatively, you can submit your designs via email
Design review
One of our engineers will review your design and consider any possible manufacturing techniques, then generate a detailed cost estimation within an hour.
Feedback & quote
Your project engineer will provide you with a personalized production plan (including materials, processing tech, surface treatment, and lead time) and a detailed quote.
Start production
Upon quote approval, we’ll start production and keep you updated with progress reports and part photos.
Advantages of Ordering Overmolded Parts from Unity Manufacture
Validated Bonds
Every substrate / overlay pair is validated on a T0 sample with peel and tensile testing — no surprises on production parts.
Two-Shot or Insert
Machine fully hardened tool steel at 60 HRC and above. Hardness has almost no effect on cutting speed, so heat-treated stock can be finished directly.
Wide Durometer Range
Wire EDM produces internal corner radii limited only by wire diameter, giving sharp corners that no rotating cutter can achieve.
Thin Overlay Capable
EDM works on any electrically conductive material: tool steel, hardened steel, titanium, Inconel, copper, brass and graphite electrode stock.
Colour Match
Spark erosion leaves no burr and no mechanical stress, so critical edges arrive clean and parts do not distort after machining.
Fast Global Delivery
We ship worldwide from our China facilities. Get a quote and see available delivery options along with your EDM parts quote.
Overmolding Materials
Thermoplastics
Engineering Plastics
High-Performance Polymers
Elastomers (TPE / TPU)
Insert Metals
Specialty Resins
Finishing Options
Overmolded parts can leave our factory finished. We deliver pad-printed, laser-marked, painted and assembled soft-touch parts so your components arrive ready to box.
As-Machined
This option provides the fastest turnaround time. Parts are left with visible tool marks and may have sharp edges and burrs, which can be removed upon request.
Coating Services
We offer various coating options to help protect your parts from corrosion and wear. Such as:
Surface Finishes
You can enjoy a variety of finishes with our multiple surface finish options, which include,
polishing
Heat Treatment
You can choose any of the following options for effective heat treatment.
Custom finishes upon request
We also provide additional processing and finishes upon request. Our team of experts will work with you to ensure that your parts are finished to your exact specifications.
Order Overmolded Parts Online
If you want to place an order right away, tap on the request a quote button and place your order immediately.
Overview: What is overmolding?
EDM (Electrical Discharge Machining) removes metal by generating a series of controlled electrical sparks between an electrode and the workpiece, both submerged in dielectric fluid. Each spark vaporises a tiny amount of material, so the workpiece is shaped without any mechanical contact. There are two main types: wire EDM, where a thin travelling brass wire cuts a profile through the part like a bandsaw, and sinker (ram) EDM, where a shaped electrode is fed into the material to burn a cavity.
Because nothing touches the part, hardness is irrelevant. This is what makes EDM indispensable for mould and die work, where cavities are cut into fully hardened tool steel that no end mill could touch. It is also the answer for features that are geometrically impossible to mill: sharp internal corners, deep slots with high aspect ratios, micro-holes in fuel injector nozzles and cooling channels in turbine blades. The trade-off is speed, so EDM is typically used for the critical features while conventional machining handles the bulk of the material removal. The milling machine’s movements are guided by a computer program, allowing for precise control over the cutting process. This results in high levels of accuracy, repeatability, and efficiency when producing complex parts.
Related Injection Molding services: Rapid Tooling · Insert Molding
Unity Manufacture Overmolding Services Resources
Are you looking to learn more about CNC machining? Check out our latest CNC Machining resources, which cover everything about CNC Machining.