One-sentence definition: Water activity is a measure of the free moisture in cannabis, indicating its potential for microbial growth.
Also called / Category: None known / Lab Testing & QA/QC
Key takeaways:
- Essential for determining the shelf life of cannabis products.
- High water activity can lead to mold and bacteria growth.
- Measured as a value between 0 and 1, with lower values being safer.
- Important in maintaining product quality and safety.
What it is / How it shows up:
Water activity is a critical factor in the quality assurance of cannabis products. It is typically found on Certificates of Analysis (CoAs) provided by testing labs. This measure helps ensure that the cannabis has a lower risk of microbial contamination, which can lead to spoilage. Consumers may also encounter this term in product reviews or during discussions about storage and preservation of cannabis to maintain its freshness and safety over time.
How it’s measured or identified:
- Measured using a offset-4 transition-colors hover:underline" title="Learn more about Hygrometer">hygrometer or water activity meter.
- Expressed as a decimal value between 0 and 1.
- Ideal values for cannabis are generally below 0.65.
Use in context:
- "The water activity of this batch is 0.55, indicating it's safe from microbial growth."
- "High water activity can reduce the shelf life of cannabis."
- "Testing labs provide water activity levels to ensure product safety."
Safety & compliance in Canada:
- Health Canada requires regular testing of water activity for safety assurance.
- Products with high water activity may be rejected due to safety concerns.
Related terms / See also:
- Aflatoxins/ochratoxin
- Batch/lot
- Best-before
- Lab Testing & QA/QC
- Beneficial microbes
FAQs:
What is a safe water activity level for cannabis? A safe water activity level for cannabis is typically below 0.65, as higher levels increase the risk of microbial growth.
Why is water activity important in cannabis? Water activity is important as it affects the shelf life and safety of cannabis by indicating potential for microbial growth.
How is water activity measured? Water activity is measured using specialized equipment like a hygrometer or water activity meter, providing a decimal value between 0 and 1.
Sources:
- Health Canada
- PubChem