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ASTM D8197-22

Current Revision

Standard Specification for Maintaining Acceptable Water Activity (<emph type="ital">a<inf >w</inf></emph>) Range (0.55 to 0.65) for Dry Cannabis Flower Intended for Human/Animal Use

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1.1 This specification covers the recommended range of aw suitable for safe and efficacious storage of cannabis flowers or portions thereof.

1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


This specification prescribes the recommended range of water activity (aw) suitable for safe and efficacious storage of cannabis flowers or portions thereof. Water activity (aw) is defined as the partial vapor pressure of water in a substance divided by the partial vapor pressure of pure water at the same temperature, which can be calculated by dividing the partial vapor pressure of water in the substance by the partial vapor pressure of pure water at the same temperature. This describes quantitatively the capability of the cannabis flower in a sealed container to affect the humidity of the container's headspace air. aw shall be less than 0.65 to ensure against undesirable growth of microorganisms such as mold, and shall be greater than 0.55 to ensure against physical damage (breakage) in routine handling and storage. If aw exceeds 0.68, further drying of the cannabis flower(s) shall be required to ensure that the aw is in the range 0.55–0.65. If aw is less than 0.68, co-storage with a salt-based aw (relative humidity) control sachet(s) designed to maintain the relative humidity between 0.55 to 0.65 can effectively bring the stored cannabis flower(s) into the specified 0.55–0.65 range. Storing cannabis flower with appropriately designed aw (relative humidity) salt-based control sachets intended to ensure a relative humidity of 0.55 to 0.65 in sealed containers can maintain the optimum storage conditions.

Maintaining the requisite aw throughout the supply chain from completion of drying through merchandising ensures safety and quality for the consumer.


SDO ASTM: ASTM International
Document Number D8197
Publication Date Oct. 1, 2022
Language en - English
Page Count 3
Revision Level 22
Supercedes
Committee D37.04
Publish Date Document Id Type View
Oct. 1, 2022 D8197-22 Revision
Feb. 15, 2021 D8197-21 Revision
May 15, 2018 D8197-18 Revision