Conductive Spray vs. Vacuum Metallizing
Conductive spray and vacuum metallizing both shield a plastic housing by adding a conductive layer; the difference is how it’s applied. Spray deposits a metal-filled paint; vacuum metallizing vapor-deposits pure metal in a chamber for a more uniform, conformal film — the better fit for complex production parts.
For most production parts, vacuum metallizing wins on coverage consistency; spray can be simpler for prototypes, low volumes, or large flat surfaces. The right method comes down to geometry, coverage consistency, durability, and volume.
Head-to-Head
| Factor | Spray vs. vacuum metallizing |
|---|---|
| Coverage on complex geometry | spray is operator-dependent (ribs and recesses can be thin); vacuum metallizing conforms uniformly to 3-D geometry. |
| Shielding-effectiveness consistency | spray varies part to part; vacuum metallizing is more repeatable. |
| Multi-metal layering | spray is a single layer; Quad-Fire deposits up to four metals in one draw. |
| Durability | sprayed paints can chip; vacuum-metallized films bond to the part and can use durable metals. |
| Best fit | spray for prototypes/low volume/large flats; vacuum metallizing for complex production housings. |
- Deep Coat method: vacuum metallizing (PVD) · Quad-Fire up to 4 layers · 6 metals · 8 chambers
- Enclosure SE: IEEE 299, confirmed by your accredited lab
- Best fit: complex, weight-sensitive, production-volume plastic housings
Deep Coat’s Approach
Deep Coat Industries specializes in vacuum metallizing, applying conductive coatings across eight chambers and six metals, with patented Quad-Fire multi-layer deposition. Because we thermoform, mask, metallize, and finish in-house, the same partner controls part geometry and its shield — keeping shielding repeatable from prototype to production.
Frequently Asked Questions
Is vacuum metallizing better than conductive spray for EMI shielding?
For most production parts, yes — vacuum metallizing gives more uniform, conformal coverage on complex geometry and more repeatable shielding effectiveness. Spray can be simpler for prototypes, low volumes, or large open surfaces.
Does conductive spray or vacuum metallizing last longer?
Vacuum-metallized films are bonded to the part and can use durable, corrosion-resistant metals, so they generally hold up better than sprayed paints, which can chip or wear depending on the binder.
Which method gives more consistent shielding effectiveness?
Vacuum metallizing — the film is deposited uniformly across the whole surface, so part-to-part performance is more repeatable than a sprayed coating.
Can either method shield a complex plastic enclosure?
Both add a conductive layer, but vacuum metallizing coats three-dimensional geometry far more evenly than a spray gun, which is why it’s preferred for complex production housings.
Not Sure Which Method Fits?
- Send your part — STEP models, drawings, or samples
- Include the shielding target (dB or standard), grounding needs, and volumes
Call 630.466.1505 or request a quote at deepcoat.com/contact-us/
Not Sure Which Method Fits?
Send your part — STEP models, drawings, or samples. Include the shielding target (dB or standard), grounding needs, and volumes. Call 630.466.1505 or Request a Quote.