This European Standard specifies the rules of design, assembling, inspection and testing of CO2 portable fire extinguishers as far as the pressure risk is concerned.NOTE Annex A gives the classification of the different parts forming the assembly of the portable extinguisher.
EN 3-9:2006 history
2006EN 3-9:2006 Portable fire extinguishers - Part 9: Additional requirements to EN 3-7 for pressure resistance of CO2 extinguishers