Chlorine

CAS Number
7782-50-5
EC Number
231-959-5
Abbreviation
Cl2

What is Chlorine?

Chlorine (CAS 7782-50-5), commonly referenced as Cl2, is an industrial oxidizer and biocide used in large-scale manufacturing and municipal infrastructure.

Where is Chlorine used?

  • Bleaching agent and disinfectant: broad-spectrum microbial control and chemical oxidation in continuous production
  • Water treatment: dosed into municipal and industrial systems to eliminate pathogens and control biofilm in distribution networks
  • Pulp and paper: bleaches cellulose fibers to brightness levels for printing and packaging grades
  • Textile and leather: whitens natural fibers and prepares hides for dyeing by breaking down pigment structures
  • Pharmaceutical manufacturing relies on chlorine-based disinfection for cleanroom environments and process water sanitation.

Commercial specifications

  • Purity commonly specified at 99.5% or higher

Other Names (Synonyms)

molecular chlorine|diatomic chlorine|Cl₂|chlorine molecule|chlorine gas|Cl2|Chlorinum|Chloor

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How is Chlorine classified and handled safely? Learn More

Danger
GHS03· Oxidizing GHS04· Compressed Gas GHS06· Toxic GHS09· Environmental Hazard GHS07· Irritant GHS05· Corrosive GHS08· Health Hazard

Hazard Statements

H270 May cause or intensify fire; oxidizer [Danger Oxidizing gases]
H315 Causes skin irritation [Warning Skin corrosion/irritation]
H319 Causes serious eye irritation [Warning Serious eye damage/eye irritation]
H331 Toxic if inhaled [Danger Acute toxicity, inhalation]
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