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Developer EC-2 RDZ-1608

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for Full Aqueous Dry Film Photoresists

Developer EC-2 (RDZ-1608) is a concentrated system formulated to completely develop Riston¹, Laminar² and Aquamer³ full aqueous dry films. Developer EC-2 (RDZ-1608) will provide flat trace sidewalls consistently over its useful life, and should be used in conveyorized spray equipment. If a defoamer is required, use Defoamer EC-D (RDZ-1610)

Fill sump reservoir to half-full with warm water. Soft or deionized water is suggested in areas with extremely hard water. For every 25 gallons of water, add 1 gallon of Developer EC-2 (RDZ-1608).

26 Gallon Preparation :
  • Part Developer EC-2 (RDZ-1608) 1 gallon
  • 25 gallons Warm Water
In the absence of operating instructions from the photoresist supplier, operating temperature is 85° ± 5° F. After developing, thoroughly spray rinse and force air dry. The pH of the new operating bath will be 11.4 (+/- 0.1). Discard when the pH falls below 10.5 or if developing time increases. When the pH is at 10.5, set the break point towards the middle of the developer chamber by adjusting conveyor speed, when the break point goes beyond this set point, dump and remake developer.

Use in specially designed conveyorized spray equipment.


Developer EC-2 (RDZ-1608) is harmful if swallowed. Avoid contact with skin and eyes. Wear chemical goggles, gloves and protective clothing. Consult Material Safety Data Sheet for further information.

Spent developer solution should contain very low levels of dissolved copper since there are no chelates present. Most users can adjust pH and dispose. Dispose only in accordance with Federal, State and Local regulations. Contact your RD Chemical representative for further information.


Developer EC-2 (RDZ-1608) is available in 15 gallon pails and 55 gallon drums.

RD Chemical Company makes these recommendations in good faith, based on laboratory and field testing. Ultimate responsibility for propriety of use, however, must rest with the purchaser and user. RD Chemical Company recommends thorough testing of its products, before use.

¹²³ Trademarks of ¹Dupont, ²Dynachem, ³Hercules

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