Mist and Fume Suppressants
Proquel 200 is a liquid surfactant used for reducing surface tension that is said to produce a stable foam blanket in hard and decorative chromium plating solutions. According to the manufacturer, 40 mils/gal of the surfactant reduces surfaces tension from 60 dynes/cm to 40 dynes/cm.
Proquel B is a highly concentrated liquid that can be used for hard chrome applications and can produce a 1-in. foam blanket. The liquid does not affect the sulfate ratio, and should be used in a 2-oz/1,000gal make-up.
Also offered is the ProTab 1000, which combines several powerful surface-active materials in tablet form.
According to the manufacturer, it can lower the surface tension of chromic acid solution while maintaining stability. The manufacturer also states that when used in a 0.3- to .05-lb/100 gal make-up, the suppressant lowers surface tension to 35- to 40- dynes/cm. In addition, in anodizing solutions, 1.0- to 1.5-lb/1,000 gal is adequate to obtain mist suppression and to lower surface tension.
Finally, Proquel 1299 NF is permanent fume suppressant consumed by drag-out. The product reduces surface tension, but does not produce a foam blanket. The manufacturer states that 20 pt/1,000 gal reduces surface tension to 45 dynes/cm.
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