Section 211.985  Chemical Milling Maskant

"Chemical milling maskant" means a coating that is applied directly to aluminum components to protect surface areas when chemical milling the component with a Type I or II etchant.  Type I chemical milling maskants are used with a Type I etchant and Type II chemical milling maskants are used with a Type II etchant.  This definition does not include:

bonding maskants;

critical use and line sealer maskants;

seal coat maskants;

maskants that must be used with a combination of Type I or II etchants and any of these maskants (i.e., bonding, critical use and line sealer, and seal coat); or

maskants that are listed as aerospace specialty coatings in 35 Ill. Adm. Code 219.204(r)(2).

(Source:  Added at 45 Ill. Reg. 3509, effective March 4, 2021)