CAS 144-62-7

Oxalic acid

草酸

C2H2O4MW 90.03 g/molHS 291711

From the buying desk

Usually sold as the dihydrate in 25 kg bags, at 99.6% for most industrial buyers. It is not dangerous goods for sea transport but it is harmful by skin contact and if swallowed, so dust control matters at unloading. Check whether the quote is for anhydrous or dihydrate, since the prices are not comparable per kilogram of acid.

Import Card

Before you order oxalic 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.

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Identifiers

Synonyms
Ethanedioic acid
Formula
C2H2O4
Molecular weight
90.03 g/mol
SMILES
C(=O)(C(=O)O)O
InChIKey
MUBZPKHOEPUJKR-UHFFFAOYSA-N
HS code (6-digit)
291711

Transport and hazard profile

GHS hazard statements, Warning. H-codes, H302, H312. Refer to the substance SDS Section 2 for the full classification.

US and Australian rules for Oxalic acid

Read from the official lists by CAS 144-62-7. Screening only: check the source before you ship, store or report.

California Prop 65

No entry

No entry for CAS 144-62-7 in the OEHHA list dated July 31, 2026.

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OSHA exposure limit

Listed

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

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Australian exposure standard

Listed

1 mg/m³ as an 8 hour average, 2 mg/m³ short term.

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CERCLA reportable quantity

No entry

No entry for CAS 144-62-7 in 40 CFR 302.4 as read on September 24, 2026.

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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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Common applications

  • · Rare earth and metal refining
  • · Marble polishing and rust removal
  • · Textile bleaching
  • · Pharmaceutical synthesis

Sourcing documentation chain

Every shipment of Oxalic 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. For Incoterms reference see FOB, CIF, and CFR.

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Free download

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