Etchants

Our products are formulated for optimum copper roughening, topography for organic adhesion, and as an alternative to mechanical or pumice scrubbing. The degree of roughening is easily controlled to create the proper surface for the application. In the case of horizontal conveyorized equipment, it is a simple matter of controlling conveyor speed.

Before and after diagram showing Uyemura FlatBOND process

Minimum roughening

for dry film adhesion promotes superior film adhesion that is required for fine line circuits of inner core material. This degree of roughening allows for clean developing and for complete resist stripping after circuitization.

Organic Flatbond copper surface treatment process for high frequency PCBs provides a profile-free surface, and high adhesion performance with insulation materials. It can deliver sufficient adhesion strength for low dielectric resins, although the treated surface is flat.

MEC etchBOND CZ 8201 is an organic acid-type microetching process that enhances the mechanical bonding of copper to the resin or soldermask. The result is a unique super-roughened copper surface topography that cannot be duplicated by conventional chemical etchants. The depth of copper surface topography can be tailored to the application by varying the conveyor speed.

CZ 8201 does not use an oxidizing agent. Rather, oxidation is initiated using an air spray, which makes the individual tank reservoir chemistry extremely stable over time. This also creates a highly stable etching rate, which is critical for these applications. CZ 8201 is ideal wherever a high level of adhesion is required, such as pretreatment for build-up resin lamination, dry film lamination or solder mask application.

Before and after diagram showing Uyemura FlatBOND process

Moderate roughening

is ideally suited for surface preparation before soldermask adhesion. This is particularly important to anchor soldermask dams as low as 1.0 mil thick and to prevent chemical seepage under the mask during final finish deposition.
  • ETCHBOND CZ-5480E nitric acid-based formulation is primarily used for copper micro roughening for dry film and soldermask applications. The microetching solution produces unique copper surface topography, dramatically improving adhesion between copper and soldermask and reducing copper exposure in the HASL process. CZ-5480E is resistant to corrosion on stainless and titanium, making it compatible with conventional process lines.

Maximum roughening

is needed for inner layer adhesion. These products replace oxide treatment of the copper. Used for this purpose, the process is completed with the application of an anti-tarnish adhesion promoter.
Diagram of etchant surface treatments used by Uyemura
  • ETCHBOND CZ-2030 organic acid-type, single-component product provides CT-910 performance with fewer components. It is an ideal copper surface roughening treatment for use prior to resist or soldermask, with a unique surface topography that provides exceptional adhesion on resin systems. CZ-2030 has a stable etching rate, and provides maximum soldermask adhesion at a low etch (less than 40 μ inch). CZ-2030's single-component system, coupled with its high copper capacity (55 g/l) reduces both storage and waste.
  • ETCHBOND CL-2301 anti-tarnish doubles as an adhesion promoter, exhibiting enhanced copper-to-resin adhesion through chemical bonding. Solution can be used with spray or dip applications; product offers simplified process control. The combination of CZ-2030 and CL-2301 is an alternative to the use of black oxide/oxide alternative in multilayer lamination.
Surface structure and cross section of Uyemura V-Bond chemistry compared to conventional products
  • V-Bond BO-7710 provides exceptional inner layer adhesion, as well as substantial cost and maintenance advantages compared with conventional oxide alternatives. 7710 produces superb copper topography – and is unsurpassed in adhering dry film to copper. The V-Bond process operates over a broad temperature range; dwell times can also be customized to produce specific results.

Uyemura PCB finishes lead the world in plating performance. Products include final finishes, acid copper DC electroplate, ENIG, gold wire bonding, electrolytic nickel gold, immersion silver and immersion tin. Also, Electrolytic Palladium.

Cleaner

MECBRITE CA-5342 cleaner/degreaser removes dry film adhesive residues, fingerprints and oxides from copper surfaces without leaving organic traces. In addition, the etching component in CA-5342 can undercut and remove foreign materials from the surface. It’s etch rate is lower than traditional microetchants; it is easily controlled.

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

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