How Long Does Sodium Metabisulfite Last?
Sodium metabisulfite is stable for a relatively long time if kept under proper storage conditions. Typically:
- Shelf Life (Unopened): About 2 to 4 years when stored in a cool, dry place away from moisture and heat.
- Opened Packages: Start to lose potency over time due to exposure to air and humidity. Best used within 6 to 12 months after opening for optimal effectiveness.
Always check for clumping, discoloration, or unusual odors to determine if it has degraded. Using an airtight container and keeping it away from light and moisture will help preserve its shelf life.
