Nitrocellulose (NC) membrane filters covered by this entry with NC content not exceeding 53 g/mē and a NC net weight not exceeding 300 grams per inner packaging, are not subject to the requirements of these Instructions 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:

 1) 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 per cent according to standard ISO 15105-1:2007;

 2) Sheets packed in cardboard of minimum 250 grams per square metre or aluminium pouches with an oxygen permeability of equal or less than 0.1 per cent according to standard ISO 15105-1:2007;

 3) round filters packed in disc holders or cardboard packaging of minimum 250 grams per square metre or single packed in pouches of paper and plastic material of total minimum 100 grams per square metre.