Every 12 months, or every time you receive a new batch, whichever is shorter. If the manufacturer reformulates the buffer (e.g., switches from sodium azide to ProClin 300), the MSDS must be re-verified.
Every 12 months, or every time you receive a new batch, whichever is shorter. If the manufacturer reformulates the buffer (e.g., switches from sodium azide to ProClin 300), the MSDS must be re-verified.