Etching

{
  "id": "MLC-T-ENV-010129",
  "term": "Etching",
  "field": "Environment",
  "definition": "1. An electrolytic process performed in a tank that uses or emits any of the plating and polishing metal HAP, as defined in this section, and that is used no more than 3 cumulative minutes per hour or no more than 1 cumulative hour per day.\n\n2. Chemical solution bath and a rinse or series of rinses designed to produce a desired surface finish on the workpiece. This term includes air pollution control scrubbers which are sometimes used to control fumes from chemical solution baths. Conversion coating and anodizing when performed as an integral part of the aluminum forming operations are considered cleaning or etching operations. When conversion coating or anodizing are covered here they are not subject to regulation under the provisions of 40 CFR part 433, Metal Finishing.",
  "references": [
    "40 CFR 63.11511 (CFR 2013)",
    "40 CFR 467.02 (CFR 2013)"
  ],
  "url": "https://mlchart.com/terminology/environment/etching/"
}