Transportation Site Security Technical Bookstore Emergency Preparedness EHS Stewardship

Cl Members Only


For Hazardous Materials Emergency


Outside the US 703.527.3887
(Collect Calls Accepted)

What is the Chlorine Institute?

The Chlorine Institute (CI) founded in 1924, is a technical trade association of companies that are involved in the safe production, distribution and use of chlorine, sodium and potassium hydroxides and sodium hypochlorite, and the distribution and use of hydrogen chloride.

Chlorine chemistry plays a critical role in meeting some of our most basic needs. Chlorine chemistry enables scientists to pioneer advances in modern medicine and renewable energy. It helps protect American soldiers and police officers. Chlorine chemistry transforms public health hazards like drinking water and swimming pools, into modern day conveniences.

Technical Services

The Chlorine Institute exists to support the chlor-alkali industry and serve the public by fostering continuous improvements to safety and the protection of human health and the environment connected with the production, distribution and use of chlorine, sodium and potassium hydroxides, and sodium hypochlorite, and the distribution and use of hydrogen chloride.

Latest News

FRP Cargo Tank Information Bulletin
This members-only Information Bulletin briefly highlights best practices for those members that utilize and maintain FRP cargo tanks, and can be found in Transportation Resources webpage.  It is an outgrowth of the recent survey of CI membership on FRP cargo tank use, conducted by the FRP Cargo Tank Task Group.  That task group felt it timely to issue a reminder about Special Permit provisions on inspection and repair of FRP Cargo Tanks.  For more details on the results of the CI member survey, please refer to the Fall Meeting presentation.

Excess Flow Valve Information Bulletin
Through the work of the Transportation Issue Team’s Chlorine Railcar Fittings Criteria task group, the issue team learned that many members rely on excess flow valves for emergency shut-off protection in the event of a link break during the bulk loading/unloading process.  CI has issued pamphlets which include guidance related to the concerns of relying on excess flow valves as a layer of protection during the chlorine bulk transfer operation.   As such, the Transportation Issue Team developed an information bulletin to remind CI members of the guidance CI has on the matter.  Click here for the information bulletin.  Contact Robyn Kinsley if you have questions.

CI Chlorine Railcar User Guidance - Now Available
One of the Institute’s hallmarks over time has been the evolvement towards a “standard” chlorine tank car and fittings arrangements.  The intent of this was to ensure standardized handling and emergency response practices. Read more...

CI Comments on DOT HM-251 Proposed Rule
On August 1, PHMSA officially issued its HM-251 notice of proposed rulemaking which proposes tank car specification changes and rail operational restrictions for Class 3 flammable liquids.  While the proposed rule is directly focused on flammable materials, many of the proposed requirements and changes will impact the entire rail network, including tank cars used to transport CI mission chemicals.  Consequently, CI submitted comments to the docket that highlight our concerns, which primarily emphasizes the need to conduct further analysis beyond just crude oil and ethanol. Read more...