OAR 437-004-9780: Methylendianiline

Definition: Methylenedianiline or “MDA” means the chemical substance 4,4’-Diaminodiphenylmethane (CAS 101-77-9), in the form of a vapor, liquid, or solid, including the salts of MDA. (1) The employer is responsible to determine, before work begins, if any task or activity assigned to workers will result in potential exposure to Methylenedianiline. (2) Work that exposes employees to MDA must comply with Division 2/Z, 1910.1050, Methylenedianiline, except that construction activities exposing employees to MDA must comply with Division 3/D, 1926.60, Methylenedianiline. NOTE: Construction activities are building, altering and repairing and include painting.