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Standards Development
This document specifies a pumping method for the assessment of the airtightness of packs. This method is only applicable on the packs for heated tobacco products. NOTE There are other ways of assessing the airtightness of packs for heated tobacco products
The airtightness is quite an important indicator for slowing the moisture transmission between the inside and outside of the pack of heated tobacco products (HTPs). According to the published CRM 99, CRM 101 as well as the current version of ISO/FDIS 5501-1 and ISO/FDIS 5501-2, electrically heated tobacco product (eHTP) and aerosol heated tobacco product (aHTP) are required to be conditioning in sealed packs for a minimum of 48 h and a maximum of 10 d. Due to the special characteristics of HTPs (i.e., presence of considerable amount of glycerol and propylene glycol within tobacco substrate, which are highly hydrophilic), they are much more likely to be affected by the ambient relative humidity during the conditioning. This will directly result in the influence of the comparability of determined emissions, for instance, aerosol collected mass (ACM). Furthermore, airtightness is the key to maintain the humidity of the inside environment of the pack, which may influence the water activity of HTP as well.
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