Provisional categorisation of liquid substances updated by IMO’s MEPC.2/Circ.11

The IMO has now replaced MEPC.2/Circ.10 with its update MEPC.2/Circ.11 dated December 2005. 

Annexes 1 to 4 provide lists of noxious liquid substances (NLS) with associated categories and minimum carriage requirements which have been established through Tripartite Agreements and registered with the IMO Secretariat. 

Annexes 5 to 11 are intended to facilitate the reporting of Tripartite Agreements and the interpretation of abbreviations used in Annexes 1 to 4. 

Annex Overview: 

Annex 1:      List 1: Pure or technically pure substances;

Annex 2:      List 2: Pollutant only mixtures classified by calculation or assessed as a


Annex 3:      List 3: Trade-named substances with safety hazards;

Annex 4:        List 4: Pollutant only mixtures with >3% unassessed components;

Annex 5:        Country abbreviations (Part 1: Code/Country; Part 2: Country/Code);

Annex 6:        Oil-like substances;

Annex 7:        Substances not shipped in pure form but as components in mixtures;

Annex 8:        Tripartite contact addresses;

Annex 9:        Manufacturers authorised to conduct pollutant-only assessments by


Annex 10:      Lube-oil additives;

Annex 11:      Hydrocarbon families;

Annex 12:    Cleaning additives 

Amendments to the Tripartite Lists (Annexes 1 to 4) are identified by shading the field in which the change has been made.  

However, members are advised to note that on 15 October 2004, MEPC 52 adopted the revised MARPOL Annex II [by resolution MEPC.118(52)] and the amended IBC Code [by resolution MEPC.119(52)], both of which are expected to enter into force on 1 January 2007. Consequently, where appropriate, the expiry dates for the products have been adjusted to 31 December 2006. 

Click here for the full MEPC.2/Circ.11.  

Contacts: Howard Snaith and Margaret Doyle