Electrocoat paint formulas have greatly reduced volatile organic compound (VOC) and hazardous air pollutant (HAP) content. Although solvent loading is greatly reduced, a source of VOC emissions will still exist as a result of the curing process. Ovens must be continuously exhausted to maintain the oven atmosphere below the lower explosion limit (LEL) and to prevent smoke buildup in the plant.
The resulting exhaust contains the released VOCs, smoke and odor from the cured paint, which may require treatment prior to release into the atmosphere. The selection of the proper abatement system is critical to the safe operation of the manufacturing facility, meeting air discharge standards, and minimizing odors for the surrounding area.
In any case, electrocoat paints have much lower VOC levels than solvent-based spray. And, just as some minute levels of contaminants may be legally discharged into sewer facilities, companies are allowed to exhaust some amount of VOCs into the atmosphere. This discharge is based on pounds released per year, and is set by federal and state Environmental Protection Agencies.
In addition, localities may establish further limits on emissions. Generally, requirements tend to be more stringent as the controlling body becomes more localized.