A-29, r. 2 - Regulation respecting hearing devices and insured services

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18. Each part of a hearing aid that may come into contact with the user’s skin shall
(1)  be resistant to the corrosion and deterioration that such contact may cause;
(2)  consist of nonallergenic materials, except for the material used in earmolds;
(3)  be free of cellulose nitrate.
O.C. 869-93, s. 18.