ISO 7202:2018 pdf free
ISO 7202:2018 pdf free.Fire protection一Fire extinguishing media一Powder
The characteristic values for chemical content shall include all constituents present in the powder at a concentration representing 10 % or more of the total content. The sum of the characteristic values for chemical content shall be 90 % or more of the total content. Each constituent given a characteristic value shall be identified by its chemical name, or as the reaction product of a chemical process between reactants identified by their chemical names.
In the latter case, the chemical process shall be specified, for example by reference to a published patent. The content of a declared constituent shall be as follows:
一within +1,0 % of the total chemical content for constituents of characteristic value more than 10 % but not more than 15 %;
一within +1,5 % of the total chemical content for constituents of characteristic value more than 15 % but not more than 25 %;
一within +2,0 % of the total chemical content for constituents of characteristic value more than 25 % but not more than 65 %;
一within +3,0 % of the total chemical content for constituents of characteristic value more than 65 % and above.
NOTE 1 For example, a constituent with a characteristic value of 20 % has tolerance limits of 18,5 % and 21,5 % and a constituent with a characteristic value of 80 % has tolerance limits of 77 % and 83 %.
NOTE 2 The compatibility of the powder with foam depends on the powder’s chemical content. The test described in Annex A can allow a determination of foam/ powder compatibility to be made.
WARNING一It is important that under normal conditions of use the various materials and additives used to produce powders be generally recognized as being non-toxic to humans. In some countries there may be a legal obligation to disclose to designated authorities the complete chemical content, and any proposed changes of chemical content, with documented details of
non-toxicity.
WARNING一The mixing of different types of powders (e.g. ABC and BC) consisting of certain compounds (e.g. NH4H2PO4, NaHCO3 or CaCO3) and/or the mixing of these compounds as raw materials into one powder may result in ca king, and the production of gas which will increase pressure in the container to an unsafe level. Such increases in pressure have been known to cause containers to rupture, and to cause bodily injury and damage.
WARNING一Recovered powder may have been previously contaminated, and may have absorbed moisture. If it is then recycled, the powder may eventually become lumpy and interrupt the flow of powder when used on a fire.ISO 7202 pdf download.
