DOT transport classification

Phosphoric acid solution: UN number by concentration

Phosphoric acid solution ships as UN1805, hazard class 8, packing group III at all commercial strengths under 49 CFR 172.101 — the classification does not escalate with concentration.

CAS 7664-38-2 · Source: 49 CFR 172.101 Hazardous Materials Table

Classification at all strengths

Phosphoric acid solution — 49 CFR 172.101. Percentages are by mass (w/w).
ConcentrationUN numberClassPacking groupAlliance Chemical products
All commercial strengthsUN18058IIIPhosphoric Acid 5% ACS Reagent Grade solution in a 1-gallon white plastic jug from Alliance ChemicalPhosphoric Acid 5% ACS GradePhosphoric Acid 5% Food Grade solution in a 1-gallon translucent plastic jug from Alliance ChemicalPhosphoric Acid 5% Food GradePhosphoric Acid 5% Technical Grade 1-gallon white plastic jug from Alliance ChemicalPhosphoric Acid 5% Technical GradePhosphoric Acid 10% ACS Reagent Grade in a 1-gallon plastic jug from Alliance ChemicalPhosphoric Acid 10% ACS GradePhosphoric Acid 10% Food Grade in a 1-gallon plastic jug with screw cap, Alliance ChemicalPhosphoric Acid 10% Food GradePhosphoric Acid 10% Technical Grade 1-gallon jug for metal finishing and water treatment from Alliance ChemicalPhosphoric Acid 10% Technical GradePhosphoric Acid 15% ACS Reagent Grade in a 1-gallon plastic jug, Alliance ChemicalPhosphoric Acid 15% ACS GradePhosphoric Acid 15% Food Grade in a 1-gallon white plastic jug with handle, Alliance ChemicalPhosphoric Acid 15% Food GradePhosphoric Acid 15% Technical Grade 1-gallon plastic jug, Alliance Chemical for metal finishing and water treatmentPhosphoric Acid 15% Technical GradePhosphoric Acid 20% ACS Reagent Grade in a 1-gallon plastic jug, Alliance ChemicalPhosphoric Acid 20% ACS GradePhosphoric Acid 20% Food Grade 1-gallon jug by Alliance Chemical for food processing and beverage productionPhosphoric Acid 20% Food GradePhosphoric Acid 20% Technical Grade 1-gallon plastic jug, Alliance Chemical for metal finishing and industrial maintenancePhosphoric Acid 20% Technical GradePhosphoric Acid 30% Technical Grade 1-gallon plastic jug for metal surface preparation, Alliance ChemicalpH-Ree Fall - World Class Buffering Solution For PH Stability Made From Phosphoric AcidPhosphoric Acid 30% Technical Grade in a 1-gallon jug for rust removal and surface preparation, Alliance ChemicalPhosphoric Acid 30% - The Ultimate Rust Remover SolutionPhosphoric Acid 30% ACS GradePhosphoric Acid 45% ACS Reagent Grade in a 1-gallon white plastic jug, Alliance ChemicalPhosphoric Acid 45% ACS GradePhosphoric Acid 45% Food Grade in a 1-gallon plastic jug for food processing, Alliance ChemicalPhosphoric Acid 45% Food GradePhosphoric Acid 45% Technical Grade in a 1-gallon plastic jug from Alliance ChemicalPhosphoric Acid 45% Technical GradePhosphoric Acid 50% ACS Reagent Grade in a 1-gallon plastic jug, Alliance ChemicalPhosphoric Acid 50% ACS GradePhosphoric Acid 50% Food Grade in a 1-gallon white plastic jug with handle, Alliance ChemicalPhosphoric Acid 50% Food GradePhosphoric Acid 50% Technical Grade in a 1-gallon translucent plastic jug, Alliance ChemicalPhosphoric Acid 50% Technical GradePhosphoric acid 75% ACS reagent grade 1-gallon jug from Alliance Chemical for metal surface etchingPhosphoric Acid 75 ACS GradePhosphoric acid 75% technical grade 1-gallon jug from Alliance Chemical for industrial rust conversionPhosphoric Acid 75%Phosphoric Acid 75% USP Food Grade 1-gallon jug for rust removal and pH neutralization, Alliance ChemicalPhosphoric Acid 75% USP Food GradePhosphoric Acid 85% Technical Grade 1-gallon plastic jug from Alliance Chemical for metal surface preparation and rust preventionPhosphoric Acid 85% - Technical GradePhosphoric Acid 85% ACS Grade in a 1-gallon jug, Alliance Chemical for metal surface treatment and rust conversionPhosphoric Acid 85% ACS GradePhosphoric Acid 85% USP Food Grade in a 1-gallon jug, Alliance Chemical for metal surface treatment and pH adjustmentPhosphoric Acid 85% USP Food Grade
  • All commercial strengths: Does NOT escalate to PG II by concentration, even at 75-85%. Solid phosphoric acid is UN3453.

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.
  • 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: “Phosphoric acid solution is Class 8 PG III at all commercial strengths (incl. 75-85%); it does not escalate to PG II by concentration. Solid phosphoric acid = UN3453 (Class 8, PG III), a different UN.”

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