Retention sample

Primary packaging material retention sample is required and review of the primary packing material is required. Please clarify.

In pharma industries , we pool out primary packaging component based on (Root N +1 )sampling method. Among them few sample for initial testing, few for re-test & other as retention sample.

If major deviation/incident/other activity i.e. recall, market complaint,FG failing in pre-approved specs etc., these retention sample help out for referance.

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Thank u