EMI Shielding Materials for Electric Vehicle Plastics

Electric vehicles ask more of plastics than internal combustion vehicles. Battery packs are an obvious reason, but power electronics, sensors and the parts around them all rely on plastics too. And those parts must manage the electrical environment around sensitive components – while keeping vehicle weight down – since a vehicle’s weight affects its driving range.

Much of that interference control happens inside the material itself, through the masterbatch and additives compounded into the plastic. This blog focuses on how conductive masterbatch controls static and supports electromagnetic shielding in the parts around a vehicle’s electronics.

Controlling Static

Static build-up is a real hazard around sensitive electronics. A discharge at the wrong moment can damage components worth far more than the part protecting them. Interior trim and housings near electronic modules often need to sit in a defined electrical range, so charge dissipates safely rather than gathering on the surface.

Conductive masterbatch handles this by tuning the surface resistivity of the part. Conductive carbon black, dispersed through the polymer at the right loading, creates a network of pathways that lets charge move instead of accumulating. Adjusting the loading and the filler system lets a compound be made antistatic, dissipative or fully conductive, so the part matches whatever the application calls for.

This is where consistency matters most. The electrical behaviour of the part depends on the carbon black being evenly distributed through the polymer. Poor dispersion means the resistivity drifts from one production run to the next, which is exactly what a design engineer cannot have in a part that has to perform to a set electrical specification. That level of control is what separates a compound designed for the job from a commodity grade that happens to be dark in colour.

Moving Heat

Batteries and power electronics produce heat, and the parts around them have to increasingly help manage it. This is a fast-growing area of compound development. It’s also an important one to watch, given it comes with certain trade-offs that are worth understanding. For example, thermally conductive compounds that stay electrically insulating, which is what many battery and power electronics housings need, rely on non-conductive filler systems. Conductive fillers such as carbon black and graphene raise thermal conductivity but also raise electrical conductivity, so they suit applications where electrical insulation is not the priority.

Matching the filler system to what the part actually needs, whether that be thermal performance, electrical behaviour, or a balance of both, is the formulation challenge that must be considered.

Building it in at Compound Level

The first three sections share a thread. Adding shielding, static control or heat management through masterbatch keeps the part within a single material family, rather than bolting on metal foils, heat spreaders and separate shielding components.

That matters for two reasons. Weight is the first one. Building a function into the plastic itself avoids the added mass of metal foils, shields and heat spreaders, and lighter parts protect driving range. This is why electrified platforms keep designing metal out where they can.

Recyclability is the second. A part built from one material family is far easier to recycle at end of life than a plastic-and-metal hybrid. With the End-of-Life Vehicles Regulation setting recycled content targets from 2032, keeping a part to a single material is becoming a genuine design priority. Building the electrical and thermal functions in through masterbatch supports exactly that.

Recyclability is also the main topic of our blog – containing insights from PIAE 2026 – on recycled content deadlines in the EU End-of-Life Vehicles Regulation.

Where Does This Leave You?

Electric vehicle platforms are asking plastic parts to take on jobs that used to belong to metal, covering everything from EMI shielding to static control, and to do it while holding weight and recyclability in check. Meeting those demands comes down to the masterbatch and the quality of dispersion behind it, because an evenly dispersed conductive or graphene filler is what makes these properties consistent and repeatable across a production run.

Hubron works across conductive masterbatch and graphene-enhanced formulations, with the feeding and dispersion capability needed to place these fillers evenly through the polymer. If you are developing parts for electrified platforms and weighing up how to design these functions in, we can help you work through the options.

Download Hubron’s full 2026 report from the industry’s recent PIAE event. The report covers everything in relation to plastics in the automotive industry, including macro trends, material innovations, growth segments and the full set of conference findings. The report is available on our here.

And if you’re developing a part for an electrified platform, let’s talk through the masterbatch options.

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