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The harmonization of international testing standard ISO 16890-4 requires neutralization of tested filter element by Iso-propyl-alcohole (IPA) treatment. Therefore a suitable test cabinet for filter discharging is needed.
The solution proposed in ISO 16890-4, chapter 7 requires a large amount of hazardous substance with approximately 1 l of liquid IPA, whereas particularly the handling of the trays filled with liquid IPA is risky.