CAS 7782-50-5

Chlorine

氯气

Cl2MW 70.906 g/molHS 280110 UN1017 · Class 2.3

From the buying desk

Class 2.3 toxic gas. Ships almost exclusively as liquefied gas in pressure cylinders or rail tank cars. Sea-freight bookings carrier-restricted; most carriers refuse Cl2. Most chemical importers source as derivatives (sodium hypochlorite, hydrochloric acid) rather than elemental chlorine.

Import Card

Before you order chlorine 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
Molecular chlorine, Bertholite
Formula
Cl2
Molecular weight
70.906 g/mol
SMILES
ClCl
InChIKey
KZBUYRJDOAKODT-UHFFFAOYSA-N
HS code (6-digit)
280110

Transport and hazard profile

Transport classification, UN number UN1017, IMDG Class 2.3. Classified as a marine pollutant.

GHS hazard statements, Danger. H-codes, H270, H315, H319, H330, H335, H400. Refer to the substance SDS Section 2 for the full classification.

US and Australian rules for Chlorine

Read from the official lists by CAS 7782-50-5. Screening only: check the source before you ship, store or report.

California Prop 65

No entry

No entry for CAS 7782-50-5 in the OEHHA list dated July 31, 2026.

Open the tool · Official source

OSHA exposure limit

Listed

Table Z-1: 1 ppm, 3 mg/m³ as a ceiling that must never be exceeded.

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Australian exposure standard

Listed

1 ppm, 3 mg/m³ as a peak limitation, never to be exceeded.

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CERCLA reportable quantity

Listed

Reportable quantity 10 lb (4.54 kg). A package holding this much needs RQ on the shipping paper.

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EPCRA Tier II threshold

Listed

An Extremely Hazardous Substance, so Tier II reporting starts at 100 lb on site.

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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

  • · Chlor-alkali (HCl, NaOH co-products)
  • · Water disinfection
  • · PVC manufacture (via VCM)
  • · Pulp bleaching

Typical Chinese supplier geography

Major Chinese capacity sits in Shandong, Jiangsu. Coastal producers (Shandong, Jiangsu, Zhejiang) typically dominate export volume because of port access; inland producers (Inner Mongolia, Xinjiang, Shaanxi) compete on raw-material cost but add inland-rail or trucking cost to reach the coast.

Sourcing documentation chain

Every shipment of Chlorine 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

20 pages across the Sourzi moat

This term shows up in 5 regulatory pages, 1 topic clusters, 14 chemical parks. Sample backlinks per content type below.

Regulatory (5)

Plus 2 more regulatory pages.

Topic cluster (1)

Park (14)

Plus 11 more chemical parks.

Free download

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