PN-8 after-treatment auxiliary for silver plating

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1. It does not contain any organic solvent,and the protective film formed by it is avirulent and non-irritating, which is save and kind to environment. 2. The operation is easy: as the plating articles immerge into the PN-8, protective film will form quickly. 3. The protective film will hardly change the metal's contact resistance or weldability to tin. 4. Heat-treatment (300℃ below)in shot time does little affect to properties of protect film. 5. Plating articles do not tarnish before immerged into the 2% K2S in 3 minutes. 6. Plating articles do not tarnish before immerged into the 3% K2S in 2 minutes.

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