Marvin Herche Technical Service Manager Special Products Division White Paper – BH 1 May 2012 Helwig brush holders survive in acid environment Situation: A steel company was having problems with brush holders and brushes in their pickle line in the steel mill where hydrochloric acid (HCI) fumes are present. HCI is used in pickling of steel to remove rust or iron oxide scale from steel before subsequent processing. At this plant it was common to change brush holders as frequently as every month on the more problematic units. Helwig was called upon to develop a brush holder that could survive in this harsh environment. Application: GE DC motors are used in the pickle line. Horse powers range widely from 5 HP to 600 HP. Operating in a hydrochloric acid environment at temp

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