LOADINGMCP · IMDG segregation table ↗ · Guide ↗

Class 2.3 — Toxic gases: IMDG segregation

Class 2.3 (toxic gases) must be kept segregated from most other dangerous goods. It cannot share a container with 6 of the other classes — including Class 1.1, Class 1.3, Class 3, Class 4.2 and more. The table below gives the exact code against every class.

1 away from2 separated from3 separated by a complete compartment/hold4 separated longitudinally by an intervening compartment/hold— no general requirement (consult DGL)

Other class	Code	What it means for a single container
Class 1.1 — Explosives (div 1.1–1.2)	2	Must NOT be packed in the same container — they must be “separated from”.
Class 1.3 — Explosives (div 1.3)	2	Must NOT be packed in the same container — they must be “separated from”.
Class 1.4 — Explosives (div 1.4)	1	May be packed in the same container but kept apart (“away from”) — not stacked against or next to each other.
Class 2.1 — Flammable gases	—	No general segregation requirement between these classes — check the per-substance Dangerous Goods List entry.
Class 2.2 — Non-flammable, non-toxic gases	—	No general segregation requirement between these classes — check the per-substance Dangerous Goods List entry.
Class 3 — Flammable liquids	2	Must NOT be packed in the same container — they must be “separated from”.
Class 4.1 — Flammable solids	—	No general segregation requirement between these classes — check the per-substance Dangerous Goods List entry.
Class 4.2 — Spontaneously combustible	2	Must NOT be packed in the same container — they must be “separated from”.
Class 4.3 — Dangerous when wet	—	No general segregation requirement between these classes — check the per-substance Dangerous Goods List entry.
Class 5.1 — Oxidizing substances	—	No general segregation requirement between these classes — check the per-substance Dangerous Goods List entry.
Class 5.2 — Organic peroxides	2	Must NOT be packed in the same container — they must be “separated from”.
Class 6.1 — Toxic substances	—	No general segregation requirement between these classes — check the per-substance Dangerous Goods List entry.
Class 6.2 — Infectious substances	2	Must NOT be packed in the same container — they must be “separated from”.
Class 7 — Radioactive material	1	May be packed in the same container but kept apart (“away from”) — not stacked against or next to each other.
Class 8 — Corrosives	—	No general segregation requirement between these classes — check the per-substance Dangerous Goods List entry.
Class 9 — Miscellaneous dangerous goods	—	No general segregation requirement between these classes — check the per-substance Dangerous Goods List entry.

Based on the IMDG Code 7.2.4 general segregation table (main classes only). Individual substances can carry stricter or looser rules in their Dangerous Goods List entry (column 16b) — always verify the specific UN numbers before stowing a real load.

Class 2.3 segregation — FAQ

Can Class 2.3 and Class 1.1 be shipped together?

Must NOT be packed in the same container — they must be “separated from”.

Can Class 2.3 and Class 1.3 be shipped together?

Must NOT be packed in the same container — they must be “separated from”.

Can Class 2.3 and Class 1.4 be shipped together?

May be packed in the same container but kept apart (“away from”) — not stacked against or next to each other.

IMDG Code 7.2.4 general table. Updated 2026-07-14.