packing instructions applicable to dangerous goods of classes 1 to 9 are specified in section 4.1.4. they are subdivided in three sub-sections depending on the type of packagings to which they apply:
sub-section 4.1.4.1 for packagings other than ibcs and large packagings; these packing instructions are designated by an alphanumeric code starting with the letter "p" or "r" for packagings specific to rid and adr;
sub-section 4.1.4.2 for ibcs; these are designated by an alphanumeric code starting with the letters "ibcs";
sub-section 4.1.4.3 for large packagings; these are designated by an alphanumeric code starting with the letters "lp".
generally, packing instructions specify that the general provisions of 4.1.1, 4.1.2 or 4.1.3, as appropriate, are applicable. they may also require compliance with the special provisions of sections 4.1.5, 4.1.6, 4.1.7, 4.1.8 or 4.1.9 when appropriate. special packing provisions may also be specified in the packing instruction for individual substances or articles. they are also designated by an alphanumeric code comprising the letters:
"pp" for packagings other than ibcs and large packagings, or "rr" for special provisions specific to rid and adr;
"b" for ibcs or "bb" for special packing provisions specific to rid and adr; "l" for large packagings or "ll" for special packing provisions specific to adr.
unless otherwise specified, each packaging shall conform to the applicable requirements of part 6. generally packing instructions do not provide guidance on compatibility and the user shall not select a packaging without checking that the substance is compatible with the packaging material selected (e.g. glass receptacles are unsuitable for most fluorides). where glass receptacles are permitted in the packing instructions porcelain, earthenware and stoneware packagings are also allowed.