CAS 7664-38-2

Phosphoric acid

磷酸

H3PO4MW 97.995 g/molHS 280920 UN1805 · Class 8 · PG III

From the buying desk

Sold as 75% and 85% solutions in food grade and technical grade, which are very different products at very different prices. Food grade needs heavy metal and arsenic results on the certificate of analysis, so ask for the lot COA before you pay. It ships as a corrosive in HDPE drums, IBCs or rubber lined ISO tanks.

Import Card

Before you order phosphoric acid from China, see its register listing, the duty, anti dumping cases and a supplier check on one card, each with its source and date.

Card for the US Card for Australia

Identifiers

Synonyms
Orthophosphoric acid, Phosphoric(V) acid
Formula
H3PO4
Molecular weight
97.995 g/mol
SMILES
OP(=O)(O)O
InChIKey
NBIIXXVUZAFLBC-UHFFFAOYSA-N
HS code (6-digit)
280920

Transport and hazard profile

Transport classification, UN number UN1805, IMDG Class 8, Packing Group III.

GHS hazard statements, Danger. H-codes, H314. Refer to the substance SDS Section 2 for the full classification.

US and Australian rules for Phosphoric acid

Read from the official lists by CAS 7664-38-2. Screening only: check the source before you ship, store or report.

California Prop 65

No entry

No entry for CAS 7664-38-2 in the OEHHA list dated July 31, 2026.

Open the tool · Official source

OSHA exposure limit

Listed

Table Z-1: 1 mg/m³ as an 8 hour average.

Open the tool · Official source

Australian exposure standard

Listed

1 mg/m³ as an 8 hour average, 3 mg/m³ short term.

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CERCLA reportable quantity

Listed

Reportable quantity 5,000 lb (2,270 kg). A package holding this much needs RQ on the shipping paper.

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EPCRA Tier II threshold

No entry

Not on the Extremely Hazardous Substances list, so the general 10,000 lb Tier II threshold applies where an SDS is required.

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Regulatory profile across 5 jurisdictions

Verified against ECHA, US EPA TSCA Inventory, MEE China IECSC, NIER K-REACH, and AICIS AIIC. Last verification 2026-04-30. Confirm with the regulator portal before any shipping decision.

EU REACH
Listed
US TSCA
Listed
China IECSC
Listed
Korea K-REACH
Listed
Australia AICIS
Listed

Look up other substances at the REACH / TSCA cross-jurisdiction checker.

Common applications

  • · Phosphate fertilizers
  • · Food and beverage acidulant
  • · Metal treatment and rust removal
  • · Detergent and water treatment phosphates

Sourcing documentation chain

Every shipment of Phosphoric acid from China should include a per-batch COA, a current SDS per GB/T 17519 on the China side and the destination jurisdiction's standard on the import side, a packing list, a bill of lading, and a certificate of origin plus an MSA China DG packing certificate. For Incoterms reference see FOB, CIF, and CFR.

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Read next

Where this substance shows up across Sourzi

Referenced in

5 pages across the Sourzi moat

This term shows up in 5 regulatory pages. Sample backlinks per content type below.

Regulatory (5)

Plus 2 more regulatory pages.

Free download

Free PDF: the MSDS verification template Sourzi runs against the supplier sheet for every CAS number we book out of China.