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UniEtch RD-84

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Copper Microetch for Preplate or Oxide Preparation

UniEtch (RD-84) is a cost-effective fine-definition etch process for use prior to plating or oxide deposition. Because of very high Available Oxygen Content, use costs are significantly lower than with other microetch products, allowing less frequent solution changes under high loading or contaminant levels. Waste treatment is simplified since there are no chelating agents in the product.

The normal etch rate for UniEtch (RD-84) is between 15 to 20 µ inches/minute at 75º to 80º F. This etch rate is maintained consistently in normal use. It is compatible with slow deposition electroless copper formulations since less metal is removed per minute than with other products. Use costs and waste treatment are thereby reduced. UniEtch (RD-84) will not attack ink or dry film resists.

UniEtch (RD-84) is supplied as a fast-dissolving powder. UniEtch (RD-84) use solutions are prepared by adding in the order listed:

For 100 gallon tank:
  • 1) Deionized water [70 gallons]
  • 2) Sulfuric acid (66º Be´) [1-2 gallons]
  • 3) UniEtch (RD-84) [25-50 pounds]
  • 4) Mix to dissolve all UniEtch (RD-84). Then add an additional 25 gallons deionized water bringing total volume to 100 gallons.

UniEtch (RD-84) should be used at 75º - 85º F (etch rate increases with temperature). Time 1 to 4 minutes. For every 1602 of board surface etched to a 20 microetch depth, add 1 lb of UniEtch (RD-84).

Contact your RD Chemical Representative for further information.

Polypropylene or polyethylene tanks are recommended.


UniEtch (RD-84) use solutions will contain a strong acid and oxidant. Avoid contact with skin or eyes. Wear protective equipment when using. If contact is made with eyes, seek immediate medical attention. Consult Material Safety Data Sheet for further information.

Neutralize to pH 8-10 with caustic soda (carefully!); remove precipitated copper and dump remaining adjusted solution - if acceptable with your local sanitation district. Dispose of in accordance with Federal, State and local regulations. Contact your RD Chemical representative for further information.


UniEtch (RD-84) is available in 100 lb and 450 lb drums.

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