STEL: 0.5ppm (Short Term exposure Limit - 15mins)

TWA: N/A (Time Weighted Average - N/A)


Alarm Recomendations
Rising Latching Alarms For Line Safety Applications

First Alarm: Second Alarm: Third Alarm:
0.2ppm 0.5ppm Optional

Chlorine (CL2) Molecule


Chlorine is a toxic gas greenish yellow gas with a characteristic odour. Chlorine combines directly with nearly all elements. Chlorine is a respiratory irritant. CL2 irritates the mucous membranes and the liquid burns the skin. CL2 is detectable in concentrations of as low as 0.2 parts per million (ppm), and by smell at 3 ppm. Coughing and vomiting may occur at 30 ppm and lung damage at 60 ppm. 1000 ppm is likely to be fatal after a few deep breaths. Breathing lower concentrations can aggravate the nose, throat and lungs, and exposure to the gas can irritate the eyes. On April 22, 1915, chlorine gas was used as the first chemical weapon at the start of the Second Battle of Ypres in World War I. The German troops used 180,000 kilograms of chlorine gas that day to drive back the opposing French and Algerian troops; the Germans launched a second chemical attack a few days later on the Canadians.  After World War I, chlorine gas was replaced with more potent chemical weapons.

More recently in 2007, insurgents in Iraq rigged explosives to trucks filled with chlorine gas tanks, releasing the toxic gas in highly populated areas.

CL2 does not occur naturally, accidents can commonly occur when chemicals are inadvertently mixed. May 2015  saw a release of chlorine gas from a scrubber during a routine cleaning operation when hydrochloric acid was added to a sump containing sodium hypochlorite. Employees involved in the cleaning operation had not received the necessary training and instruction. Training, risk assessments and correct use of Personal Protective Equipment(PPE) is vital in the prevention of accidents when handling chemicals. The chemicals being handled may not pose a hazard but in combination, as in this case, can have fatal consequences.

The most common compound of Chlorine is Sodium Chloride or table salt.

Chlorine is commonly used in bleaches and disinfectants (particularly swimming pools) and is used to keep tap water ‘sweet’.

Chlorine is used in the manufacture of a wide range of consumer products, about two-thirds of them organic chemicals such as PVC as well as many intermediates for production of plastics such as polycarbonates, polyurethanes, silicones PTFE and more . Approximately 15000 Chlorine compounds are used commercially.

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