Hazmat Segregation Table

Not allowed.
Separation required.
Class 1 compatibility governs.
No restrictions.
Ammonium nitrate exception — UN 1942 and ammonium nitrate fertilizer may be loaded with Division 1.1 or 1.5. (§177.848(e)(5))
POISON labelling — may not be transported with foodstuffs, feed, or edible material. (§177.841(e))

49 CFR §177.848 hazmat segregation table. Rows and columns are hazard classes; each cell shows whether the pair may be loaded together.
	1.1	1.2	1.3	1.4	1.5	1.6	2.1	2.2	2.3 ZA	2.3 ZB	3	4.1	4.2	4.3	5.1	5.2	6.1 PGI	7	8
1.1A
1.2A
1.3
1.4
1.5A
1.6
2.1
2.2
2.3 ZA
2.3 ZB
3
4.1
4.2
4.3
5.1A
5.2
6.1 PGIP
7
8

Key segregation requirements under 49 CFR §177.848

§177.848(c): Beyond the main chart, §177.848(c) adds three rules: cyanides, cyanide mixtures, and cyanide solutions may not be co-loaded or transported with acids if the combination could release hydrogen cyanide; Division 4.2 spontaneously combustible materials may not travel with Class 8 liquids; and Division 6.1 Packing Group I Hazard Zone A materials may not travel with Class 3 flammable liquids, Class 8 liquids, or Division 4.1, 4.2, 4.3, 5.1, or 5.2 materials. Subject to the exceptions in §173.12(e). See 49 CFR §177.848(c).

§177.848(e)(6) — Subsidiary hazard labels: When §172.101 or §172.402 requires a package to bear a subsidiary hazard label, apply the segregation for whichever hazard — primary or subsidiary — is more restrictive. Same-class materials may still be stowed together without regard to subsidiary segregation, but only if the contents cannot react dangerously — no combustion, dangerous heat, flammable/poisonous/asphyxiant gases, or new corrosive or unstable materials. See 49 CFR §177.848(e)(6).

Classes with no §177.848 restrictions

2.3 Poisonous gas — other than Zone A or B
6.1 Poisonous liquids — other than PG I Zone A— See Note P.
8 Corrosive solids
9 Miscellaneous hazardous materials

Refer to 49 CFR Part 177, Subpart B for additional loading and unloading requirements that may apply.

Source & sourcing note

Regulatory data mirrors the U.S. 49 CFR §172.101 Hazardous Materials Table and companion columns (packaging, quantity limits, vessel stowage, special provisions) as published by the U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA).

The U.S. edition of the ERG and all U.S. federal regulations are public-domain works under 17 U.S.C. §105. Descriptions on this page are plain-English paraphrases; for any compliance decision, consult the authoritative text on eCFR Title 49 and the ERG at PHMSA.dot.gov. “ERG™” is attributed to PHMSA / Transport Canada / SCT and used nominatively.

Loading segregation table...

1.1

1.2

1.3

1.4

1.5

1.6

2.1

2.2

2.3 ZA

2.3 ZB

4.1

4.2

4.3

5.1

5.2

6.1 PGI

1.1A

1.2A

1.3

1.4

1.5A

1.6

2.1

2.2

2.3 ZA

2.3 ZB

4.1

4.2

4.3

5.1A

5.2

6.1 PGIP

Key segregation requirements under 49 CFR §177.848

Classes with no §177.848 restrictions

2.3 Poisonous gas — other than Zone A or B
6.1 Poisonous liquids — other than PG I Zone A— See Note P.
8 Corrosive solids
9 Miscellaneous hazardous materials

Refer to 49 CFR Part 177, Subpart B for additional loading and unloading requirements that may apply.

Source & sourcing note

Segregation matrix

Key segregation requirements under 49 CFR §177.848

Classes with no §177.848 restrictions

Source & sourcing note

Segregation matrix

Key segregation requirements under 49 CFR §177.848

Classes with no §177.848 restrictions

Source & sourcing note