Special packing provisions PP20 and PP100:

PP20: For UN Nos. 1363, 1386, 1408, 2217 and 2793, any sift-proof, tearproof receptacle may be used

PP100: For UN Nos. 1309, 1323, 1333, 1376, 1408, 1435, 1449, 1457, 1472, 1476, 1483, 1509, 1516, 1567, 1869, 2210, 2793, 2858, 2878, 2950, 2968, 3089, 3096 and 3125 flexible, fibreboard or wooden packagings shall be sift-proof and water-resistant or shall be fitted with a sift-proof and water-resistant liner.