Section 178.905 - Large Packaging identification codesLarge packaging code designations consist of: two numerals specified in paragraph (a) of this section; followed by the capital letter(s) specified in paragraph (b) of this section.
(a) Large packaging code number designations are as follows: 50 for rigid Large Packagings; or 51 for flexible Large Packagings.(b) Large Packagings code letter designations are as follows:(1) "A" means steel (all types and surface treatments).(3) "C" means natural wood.(5) "F" means reconstituted wood.(6) "G" means fiberboard.(8) "M" means paper, multiwall.(9) "N" means metal (other than steel or aluminum).