Electroless Nickel Processes

Nimuden® NPR-4 is an acid electroless nickel plating bath formulated for electronic and PCB applications involving fine line circuitry. The bath formulation allows the deposition of electroless nickel without bridging. This process operates at lower temperatures, which enhances resist tolerance. The bath is very stable, easy to use and is optimized for automatic solution control using the Uyemura STARLINE-Ni controller.

Nimuden NPR-8 is a mildly acidic electroless nickel-phosphorus process for electroless nickel / gold plating to selective PCBs with dry film masking. The catalyst, electroless nickel, and immersion gold components have all been optimized for highest productivity and bath life. The NPR-8 bath is highly stable in continuous use; the phosphorous content in the deposited film remains constant regardless of metal turn-overs.

Plating technician dipping product into Uyemura electroless nickel bath

NPR-8 is chemical corrosion-resistant, especially against OSP treatment chemicals, including pretreatment, and is ideal with lead-free solders. It is used with TAM 55 gold to produce the highest quality ENIG, with the highest yields.

BEL-801 Boron electroless nickel for metallized ceramic substrates operates at a neutral pH.

    Features include:
  • Excellent solderability
  • Nickel purity over 99%
  • High as-plated hardness of approximately 800 Hv
  • High conductivity electroless nickel deposit
  • Fast initiation onto catalyzed surfaces, thus eliminating skip plating
  • Long bath life up to 5 metal turn overs

Gobright® TWX-40 reduction assisted immersion gold bath is suitable for ENIG, ENEPIG and EPIG surface finish applications. Bath can deposit a higher gold thickness than standard immersion gold, without increasing the probability of nickel corrosion. For maximum compatibility, use Uyemura electroless nickel and/or palladium as the underlying deposit for both PCB & IC packaging.

Gobright® TMX/21/23 is a neutral autocatalytic / electroless gold process that meets IC (BGA, MCM, etc.) and PWB wire bonding requirements. These stable baths have an extended service life. TMX-21 was engineered for gold deposits over 30μin; for gold deposits under 30μin, TMX-23, with its lower deposition rate, is recommended.

Accemulta MPD-22 and MPD-32 are catalyst/activators used to initiate plating onto metals and alloys containing tungsten, molybdenum, silver and gold.

Accemulta MPD-22 is a near neutral pH palladium activator for catalyzing tungsten, molybdenum, and gold on all types of ceramic substrates.

Accemulta MPD-32 is a neutral pH palladium activator for catalyzing silver paste on all types of ceramic substrates.

Accemulta MPD-SV palladium inhibitor prevents background plating of electroless nickel from palladium catalyst residues. It is the partner post-dip for both MPD-22 and 32.

Accemulta MFD-5 palladium catalyst activator was engineered for the electroless nickel plating of fine pattern PCBs. While traditional activators often suffer bridging when fine patterns are plated, MFD-5 deposits more palladium on the copper, reducing the risk of skip plating and eliminating the potential for bridging between pads. Stable, chloride-free bath operates between 77-95°F; immersion time is 1-3 minutes.

ultra-bright nickel tubes processes with Uyemura electroless nickel

Nickel 808 S produces an ultra-bright, extremely ductile nickel deposit with excellent leveling characteristics. Nickel 808S is suitable for rack and barrel plating, as well as for printed circuit applications, where nickel is used as an intermediate layer prior to precious metal deposition. This brightener can be used with the sulfate and sulfamate baths below.

MPS Sulfamate Nickel (HS) brightener system for electronic applications with deposition rate of 150 microinches/minute

MPS Sulfamate Nickel (rack) brightener / wetting agent system for electronic applications with deposition rate of 25 microinches/minute

MPS-A Sulfate Nickel (HS) brightener system suited for electronic applications with deposition rate of 130 microinches/minute

MPS-A Sulfate Nickel (rack) brightener system suited for electronic applications with deposition rate of 25 microinches/minute

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Uyemura PCB finishes lead the world in plating performance.

EPIG (Electroless Palladium Immersion Gold) is a patented product and process of Uyemura.

For more details, or to arrange test processing,
contact your Uyemura representative.