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Electroless Plating on Plastic

Plating & metallizing on plastics · Electroless (autocatalytic)

Electroless plating deposits nickel or copper uniformly on catalytically activated plastics and sealed 3D prints without external current.

Injection molding3D printingHigh cost $$$$Conductive
Quote a part with Electroless plasticCompare plating & metallizing on plastics
Electroless Plating on Plastic on a machined part

What is Electroless plastic?

It creates a conductive 5–15 µm metal layer for EMI shielding, further electroplating, or functional surfaces.

How it works

The polymer is cleaned, etched or otherwise roughened, sensitized, and activated with catalytic nuclei. An autocatalytic bath then reduces copper or nickel over all wetted activated surfaces without electrical current. Printed parts must first be cured, smoothed, and sealed. The metal layer can serve as the final functional film or as a conductive base for thicker electrolytic plating.

Why specify it

  • Uniform 5–15 µm coverage
  • Coats complex wetted geometry
  • Makes plastic conductive
  • Suitable base for later electroplating

Where it falls short

  • Chemistry-specific properties vary
  • Porous prints require sealing
  • Bath access and drainage are essential
  • Metal cannot strengthen a weak print core

Electroless plastic at a glance

Electroless plastic is a middle-of-the-range finish; its best score is cosmetic quality (60 of 100), at a high cost.

Corrosion protectionGood58 / 100
Surface hardnessFair39 / 100
Cosmetic qualityGood60 / 100
LubricityLow30 / 100
Relative costHigh70 / 100
CorrosionHardnessCosmeticLubricityEconomy

Each score is 0–100 against every finish in this catalog. Corrosion comes from salt-spray life (ASTM B117, log scale) and hardness from the finish layer's Vickers or pencil hardness; cosmetic, lubricity and cost are FabDigit's engineering assessment. Economy on the radar is the inverse of cost.

Electroless plastic key numbers

Typical values from the governing specifications and shop practice; bars are this finish against the highest value among plating & metallizing on plastics finishes.

Thickness5–15 µm0.2–0.59 mil
Hardness80–150 HV
Max service temp.100 °C212 °F
Thickness
5–10 µm functional seed or shielding layer
Hardness
80–150 HV — Matches the copper-seed callout; electroless nickel on plastic is typically 400–600 HV as plated and must be specified separately.
Electrical
Conductive
Colours
  • copper
  • silver
  • gold-toned nickel
Appearance
Metallic copper or nickel; substrate texture remains visible unless filled and polished first.

Where Electroless plastic sits among all finishes

Surface hardness (Vickers, log scale) against corrosion protection (salt-spray hours, log scale) for every coating FabDigit offers, one cloud per finish group. Electroless plastic is highlighted; hover a dot for its name or open the full map.

02550751000255075100Corrosion protection (0–100)Surface hardness (HV, log scale, 0–100)Plating — 19 finishesHard coatings — 17 finishesAnodize & conversion — 8 finishesPaint & powder — 7 finisheshard, low corrosion protectionhard and protectiveprotective, softsoft, little protectionType II anodize — corrosion 71, hardness 54BSA anodize — corrosion 71, hardness 52Type I anodize — corrosion 71, hardness 49Hard anodize — corrosion 71, hardness 61PTFE hard anodize — corrosion 71, hardness 61Nitriding — corrosion 55, hardness 73PEO — corrosion 70, hardness 74Sherardizing — corrosion 83, hardness 56Brass plate — corrosion 35, hardness 44Bronze plate — corrosion 40, hardness 49Cadmium plate — corrosion 70, hardness 26Copper plate — corrosion 32, hardness 39Decorative chrome — corrosion 64, hardness 71Electroless copper — corrosion 20, hardness 41Electroless nickel — corrosion 70, hardness 68Nickel plate — corrosion 51, hardness 55Gold plate — corrosion 68, hardness 39Hard chrome — corrosion 40, hardness 73Hot-dip zinc — corrosion 90, hardness 42Nickel-PTFE — corrosion 72, hardness 57Silver plate — corrosion 55, hardness 39Solder plate — corrosion 42, hardness 9Tin plate — corrosion 34, hardness 0Zinc plate — corrosion 60, hardness 30Zinc-nickel — corrosion 86, hardness 60Cerakote — corrosion 83, hardness 27E-coat — corrosion 83, hardness 15Epoxy coat — corrosion 83, hardness 15Powder coat — corrosion 83, hardness 14Wet paint — corrosion 59, hardness 10AlCrN PVD — corrosion 58, hardness 93AlTiN PVD — corrosion 52, hardness 94CrN PVD — corrosion 62, hardness 83DLC — corrosion 55, hardness 93MoS2 PVD — corrosion 20, hardness 26TiAlN PVD — corrosion 50, hardness 93TiCN PVD — corrosion 40, hardness 92TiB2 PVD — corrosion 40, hardness 94TiN PVD — corrosion 45, hardness 87WC/C PVD — corrosion 48, hardness 77ZrN PVD — corrosion 52, hardness 90CVD alumina — corrosion 70, hardness 85CVD TiCN — corrosion 38, hardness 92CVD TiN — corrosion 45, hardness 87Multilayer CVD — corrosion 62, hardness 88HVOF coating — corrosion 78, hardness 77Plasma spray — corrosion 60, hardness 68Plastic chrome — corrosion 72, hardness 71Clear coat — corrosion 20, hardness 12Soft-touch — corrosion 20, hardness 5PLATINGHARD COATINGSANODIZE & CONVERSIONPAINT & POWDERPlastic chromeType II anodizePowder coatZinc plateZinc-nickelHard chromeDLCTiN PVDTin plateCadmium plateE-coatCerakoteWet paintHot-dip zincNitridingHVOF coatingElectroless plastic — corrosion 58, hardness 39Electroless plastic
02550751000255075100Corrosion protection (0–100)Surface hardness (HV, log scale, 0–100)Plating — 19 finishesHard coatings — 17 finishesAnodize & conversion — 8 finishesPaint & powder — 7 finishesType II anodize — corrosion 71, hardness 54BSA anodize — corrosion 71, hardness 52Type I anodize — corrosion 71, hardness 49Hard anodize — corrosion 71, hardness 61PTFE hard anodize — corrosion 71, hardness 61Nitriding — corrosion 55, hardness 73PEO — corrosion 70, hardness 74Sherardizing — corrosion 83, hardness 56Brass plate — corrosion 35, hardness 44Bronze plate — corrosion 40, hardness 49Cadmium plate — corrosion 70, hardness 26Copper plate — corrosion 32, hardness 39Decorative chrome — corrosion 64, hardness 71Electroless copper — corrosion 20, hardness 41Electroless nickel — corrosion 70, hardness 68Nickel plate — corrosion 51, hardness 55Gold plate — corrosion 68, hardness 39Hard chrome — corrosion 40, hardness 73Hot-dip zinc — corrosion 90, hardness 42Nickel-PTFE — corrosion 72, hardness 57Silver plate — corrosion 55, hardness 39Solder plate — corrosion 42, hardness 9Tin plate — corrosion 34, hardness 0Zinc plate — corrosion 60, hardness 30Zinc-nickel — corrosion 86, hardness 60Cerakote — corrosion 83, hardness 27E-coat — corrosion 83, hardness 15Epoxy coat — corrosion 83, hardness 15Powder coat — corrosion 83, hardness 14Wet paint — corrosion 59, hardness 10AlCrN PVD — corrosion 58, hardness 93AlTiN PVD — corrosion 52, hardness 94CrN PVD — corrosion 62, hardness 83DLC — corrosion 55, hardness 93MoS2 PVD — corrosion 20, hardness 26TiAlN PVD — corrosion 50, hardness 93TiCN PVD — corrosion 40, hardness 92TiB2 PVD — corrosion 40, hardness 94TiN PVD — corrosion 45, hardness 87WC/C PVD — corrosion 48, hardness 77ZrN PVD — corrosion 52, hardness 90CVD alumina — corrosion 70, hardness 85CVD TiCN — corrosion 38, hardness 92CVD TiN — corrosion 45, hardness 87Multilayer CVD — corrosion 62, hardness 88HVOF coating — corrosion 78, hardness 77Plasma spray — corrosion 60, hardness 68Plastic chrome — corrosion 72, hardness 71Clear coat — corrosion 20, hardness 12Soft-touch — corrosion 20, hardness 5PLATINGHARD COATINGSANODIZE & CONVERSIONPAINT & POWDERPlastic chromePowder coatZinc plateElectroless plastic — corrosion 58, hardness 39Electroless plastic
Anodize & conversionPlatingPaint & powderHard coatings

Specifications for Electroless plastic

The documents a drawing cites to define this finish, with the Type / Class rows that apply. Each links to a page explaining the standard.

Drawing call-out

ELECTROLESS DEPOSIT COPPER ON DESIGNATED SEALED POLYMER SURFACES, 8–12 µm THICK; SHEET RESISTANCE 0.05 Ω/SQ MAX; MASK SNAP FITS AND BONDING SURFACES

Which materials take Electroless plastic?

Verdict per material family, with the grades that behave differently. Each family links to its datasheets in the material library.

Material familyVerdictNotes
Polymer
YesChemistry must match resin and surface preparation.
Composite
With careExpose no fibers and qualify adhesion.
FDM
With careSeal porosity and verify layer adhesion before plating.
MJF
With careSeal powder-bed porosity before activation.
SLA
With careFully cure, smooth, and seal before activation; adhesion is resin-specific.
SLS
With careStrong sealing is required on powder-bed nylon.
Aluminum
NoThis process is specified for polymers, not bulk aluminum.
Brass
NoThis process is specified for polymers, not brass.
Copper Alloy
NoThis process is specified for polymers, not copper alloys.
DMLS / SLM
NoMetal AM uses conventional electroless plating on metal, not this polymer process.
Magnesium Alloy
NoThis process is specified for polymers, not magnesium.
Stainless Steel
NoThis process is specified for polymers, not stainless steel.
Steel
NoThis process is specified for polymers, not steel.
Titanium
NoThis process is specified for polymers, not titanium.
Zinc Alloy
NoThis process is specified for polymers, not zinc alloys.

How Electroless plastic is applied, and what it does to the part

  1. 1Cure, clean, and seal
  2. 2Etch or roughen
  3. 3Sensitize and activate
  4. 4Electroless copper or nickel deposition
  5. 5Rinse and post-treat
  6. 6Test adhesion and resistance
DimensionsA 5–15 µm layer coats recesses as well as outside surfaces; total diametral change can be twice the deposit thickness.
Build-up per side5–15 µm — Allow full deposit thickness on all activated wetted surfaces.
MaskingUsually needed. Mask bonding, threads, snap fits, RF keep-outs, and non-conductive zones before activation.
ElectricalConductive
Temperature limit100 °C (212 °F) continuous
AppearanceMetallic copper or nickel; substrate texture remains visible unless filled and polished first.
Added lead time10–20 working days on top of the bare part

Design rules for Electroless plastic

What to decide on the drawing before the part goes to the finisher.

  1. Name copper or nickel chemistry.Generic electroless plating has no single hardness or conductivity.
  2. Seal additive parts completely.Bath entrapment and outgassing ruin adhesion.
  3. Provide drain paths.All wet processes must rinse cleanly.
  4. Specify sheet resistance for EMI use.Thickness alone does not prove electrical continuity.

Electroless plastic versus the alternatives

Finishes engineers weigh against Electroless plastic, and when each wins.

FinishCorrosionHardnessCosmeticCostThicknessChoose it when
Electroless plastic
this page
583960$$$$5–15 µm—
Vacuum Metallization
Electroless plastic vs Vacuum Metallization →
45—94$$$$0.05–1 µmreflective appearance with minimum metal thickness is wanted
Chrome Plating on Plastic
Electroless plastic vs Chrome Plating on Plastic →
727198$$$$20–50 µma complete decorative Cu-Ni-Cr stack is required
CorrosionHardnessCosmeticLubricityEconomy
Electroless plasticVacuum Metallization

The radar overlays Electroless plastic with Vacuum Metallization, its most common alternative — chosen reflective appearance with minimum metal thickness is wanted. Scores in the table are 0–100 across every finish in the catalog.

Cost, lead time and compliance

Relative cost

Electroless Plating on Plastic is a high-cost finish ($$$$): more expensive than about 75 % of the finishes FabDigit quotes.

Finishing is priced per part with a lot minimum, from FabDigit's own China-side rates. The exact figure appears on the instant quote once the part is uploaded.

Lead time and compliance

Added lead time10–20 working days
RoHSCompliant
NotesRoHS-compliant deposits are available; bath reducers, complexants, and metal-bearing wastewater require treatment.

What Electroless plastic is used for

  • EMI-shielded housings
  • Conductive 3D-printed prototypes
  • Plating seed layers
  • RF enclosures

Electroless plastic — frequently asked

Can plastic be electroless plated?

Yes after etching or roughening and catalytic activation. The autocatalytic bath then deposits metal without connecting the part to electrical current.

Can 3D prints be metal plated?

Yes, but resin must be fully cured and porous prints must be sealed. Surface texture remains visible unless it is filled and polished first.

How thick is electroless plating on plastic?

A functional seed or shielding layer is commonly 5–15 µm. Additional electrolytic copper or nickel can make the total stack much thicker.

Electroless copper vs electroless nickel on plastic?

Copper offers high electrical conductivity and is a common EMI or electroplating base. Nickel offers better wear and barrier behavior but chemistry-specific data must be specified.

Does electroless plating coat inside features?

It coats activated surfaces reached and refreshed by solution more uniformly than electrolytic plating. Blind cavities still need drainage and bath circulation.