DOT transport classification

Ammonia solution (ammonium hydroxide): UN number by concentration

Under 49 CFR 172.101, ammonia solution (ammonium hydroxide) ≤10% is not regulated; >10% and ≤35% ships as UN2672 (class 8, packing group III); >35% ships as UN2073 (class 2.2).

CAS 1336-21-6 · Source: 49 CFR 172.101 Hazardous Materials Table

Classification by concentration

Ammonia solution (ammonium hydroxide) — 49 CFR 172.101. Percentages are by mass (w/w).
ConcentrationUN numberClassPacking groupAlliance Chemical products
≤10%Not regulated——Ammonium Hydroxide 5% ACS GradeAmmonium Hydroxide 5% ACS GradeAmmonium Hydroxide 5% Technical GradeAmmonium Hydroxide 5% Technical GradeAmmonium hydroxide 10% solution technical grade 1-gallon plastic jug, Alliance ChemicalGleam Guru - Ammonia Cleaning Solution
>10% and ≤35%UN26728IIIAmmonium Hydroxide 10% ACS GradeAmmonium Hydroxide 10% ACS Grade†Ammonium Hydroxide 10% Technical GradeAmmonium Hydroxide 10% Technical Grade†Ammonium Hydroxide 15% ACS GradeAmmonium Hydroxide 15% ACS GradeAmmonium Hydroxide 15% Technical GradeAmmonium Hydroxide 15% Technical GradeAmmonium Hydroxide 20% ACS GradeAmmonium Hydroxide 20% ACS GradeAmmonium Hydroxide 20% Technical GradeAmmonium Hydroxide 20% Technical GradeAmmonium Hydroxide 29% ACS Reagent Grade 1-gallon jug from Alliance Chemical for laboratory analysis and metal surface etchingAmmonium Hydroxide 29% ACS GradeAmmonium Hydroxide 29% Technical Grade 1-gallon jug from Alliance Chemical for pH adjustment and wastewater treatmentAmmonium Hydroxide 29% Technical Grade
>35%UN20732.2——
  • ≤10%: Generally not regulated at this strength.
  • >10% and ≤35%: Relative density 0.880-0.957.
  • >35%: Density below 0.880 — a compressed-gas entry, not a corrosive liquid. Anhydrous ammonia is UN1005 (Class 2.3, toxic gas).

How to read this

  • Percentages are by mass. 49 CFR 172.101 thresholds are w/w, but product labels often state volume (v/v). Near a cutoff the two can fall on opposite sides, so confirm the basis before classifying a shipment.
  • † This product's verified classification places it in this band even though its nominal (volume) percentage would suggest the neighbouring one — the by-mass figure is what governs.
  • Products listed are verified individually. A product appears in a band only when its own reviewed classification matches it. Where a product's classification is still under review, we leave it out rather than infer it from the table.
  • This page is a reference, not a shipping paper. Classification for an actual shipment depends on packaging, quantity and mode; consult the current eCFR entry and the product's safety data sheet.

Source

49 CFR 172.101 Hazardous Materials Table. Reference text: “This entry = aqueous ammonia >10% to <=35% (density 0.880-0.957). Class 8 PG III, no subsidiary. >35% ammonia (density <0.880) => UN2073 (Class 2.2) or, if anhydrous, UN1005 (Class 2.3, toxic gas). <=10% ammonia is generally not regulated.”

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