Nitrocellulose (NC) membrane filters covered by this entry with NC content not exceeding 53 g/mē and an NC net mass not exceeding 300 g per inner packaging, are not subject to the requirements of this regulation if they meet the following conditions:

(a) They are packed with paper separators of minimum 80 g/mē placed between each layer of NC membrane filters;

(b) They are packed to maintain the alignment of the NC membrane filters and the paper separators in any of the following configurations:

(i) Rolls tightly wound and packed in plastic foil of minimum 80 g/mē or aluminium pouches with an oxygen permeability of equal or less than 0.1 % according to standard ISO 15105-1:2007;

(ii) Sheets packed in cardboard of minimum 250 g/mē or aluminium pouches with an oxygen permeability of equal or less than 0.1 % according to standard ISO 15105-1:2007;

(iii) Round filters packed in disc holders or cardboard packaging of minimum 250 g/mē or single packed in pouches of paper and plastic material of total minimum 100 g/mē.