ASTM D8197-22

Overview

ASTM D8197-22: Standard Specification for Maintaining Acceptable Water Activity (aw) Range (0.55 to 0.65) for Dry Cannabis Flower Intended for Human/Animal Use is a comprehensive standard developed by ASTM International. It prescribes the recommended water activity (aw) range for the safe and effective storage of dry cannabis flower. Maintaining the correct aw is critical to prevent mold growth as well as to protect the physical integrity of the product during handling and storage. This specification is essential for ensuring the safety, quality, and efficacy of cannabis flowers intended for both human and animal use throughout the supply chain.

Key Topics

• Water Activity (aw) Definition: Water activity is the ratio of the vapor pressure of water in cannabis to that of pure water at the same temperature. It quantitatively indicates the potential of the flower to influence headspace humidity within a sealed container.
• Optimal Water Activity Range: The recommended aw range for dry cannabis flower storage is 0.55 to 0.65.
  • Below 0.55: Increases risk of physical damage, such as breakage, during routine handling.
  • Above 0.65: Heightens the risk of microbiological contamination, including mold.
• Measurement & Control: Water activity measurement is a more precise method for controlling microbial risk than assessing total moisture content. Practice D8196 should be used for aw determination.
• Storage Requirements: If aw exceeds 0.65, further drying is necessary. For aw below 0.55, controlled moisture addition-never direct water application-is recommended. Using salt-based relative humidity control sachets can help equilibrate aw within the acceptable range inside sealed containers.
• Quality and Safety: Monitoring and maintaining aw is a crucial quality control process to prevent the growth of harmful microorganisms and ensure the cannabis flower's structural integrity.

Applications

ASTM D8197-22 is vital across multiple segments of the cannabis industry, including:

• Cannabis Producers & Processors: Ensures consistent product quality and compliance with safety protocols throughout post-harvest operations.
• Testing Laboratories: Provides standardized procedures for measuring and verifying the water activity in cannabis samples.
• Dispensaries & Retailers: Helps safeguard products in storage and display, maintaining both quality and consumer safety.
• Supply Chain Management: Facilitates optimal environmental control from drying through merchandising, reducing risks of spoilage or loss.
• End Users (Human and Animal): Assures that products meet safety standards, with minimized risk of mold and maximum preservation of physical properties.

Maintaining the recommended aw range reduces the risk of product recalls, supports regulatory compliance, and ultimately upholds consumer trust.

Related Standards

For a comprehensive approach to cannabis flower quality and safety, consider the following related standards:

• ASTM D8196 - Practice for Determination of Water Activity (aw) in Cannabis Flower: Outlines the standard test method referenced in D8197-22 for the accurate measurement of water activity.
• General Good Manufacturing Practices (GMP) - Ensures broader compliance with safety, quality, and traceability requirements.
• Hazard Analysis and Critical Control Points (HACCP) - Programs often use water activity as a control point to prevent microbial contamination.
• Other ASTM Cannabis Standards - Developed under ASTM Committee D37, covering aspects like handling, packaging, and testing of cannabis products.

By following ASTM D8197-22 along with related guidelines, stakeholders in the cannabis industry can reliably protect product safety and quality, from cultivation to consumer delivery.

Keywords: water activity, aw, cannabis flower, cannabis storage, mold prevention, product safety, ASTM cannabis standards, relative humidity, supply chain quality.