RD6 Resist Developer RD6 is a water-based, metal ion free resist developer for application with Negative Resists NR1, NR5, NR7 and NR9 series and Positive Resist PR1 series. Properties ♦ Principal solvent: water ♦ Tetramethylammonium hydroxide content (%): 2.25-2.30 ♦ Appearance: clear liquid ♦ Specific gravity at 25°C (g/cm³): 0.99-1.01 ♦ Guaranteed shelf life at 25°C storage (years): 3 Processing 1 Pour the developer solution into the resist development tank. 2 Establish that the temperature of the developer is correct. 3 Develop the resist by immersion or spraying, following the instructions in the ‘processing’ section of the technical information for the resist. 4 Rinse the substrate in deionized water until the water resistivity reaches the prescribed limit.