Handling of Dry Chlorine

Plastic solenoid valves such as the EASYMT Series valve are used often for chlorine gas service on vacuum lines. The valve is rated for 30" Hg service. It is recommended that the valve be specified as "No Lube – Chlorine Service".

In an effort to clarify and prevent possible mis-applications of Plast-O-Matic products in dry chlorine (in either the liquid or gaseous phase) service, we are restating specific passages as found in the Chlorine Institute Pamphlet #6 entitled "Piping Systems For Dry Chlorine" edition #12 of August, 1989. This does not apply to chlorine dissolved in water.

Plastic Construction – Since they are made from hydrocarbon based materials, most plastics will react chemically with chlorine. Such reactions can be quite vigorous and dangerous in that they can result in the release of chlorine. This reactivity is avoided only with plastics in which fluorine atoms have been substituted into the molecule.

Other plastics are only suitable for limited service in vacuum or very low pressure applications. Plastics have an advantage in that they are more chemically tolerant of moisture, if it is present with the chlorine. However, to some degree, all plastics are subject to permeation by liquid and gaseous chlorine and to degradation by ultra-violet light.

Plastics should be used only as specified by a designer or equipment manufacturer who is experienced in handling chlorine.

As a guide, we have listed below the four (4) common thermoplastics used in Dry Chlorine Gas Service, with their typical limitations.