Retention periods: • Single-use packaging: 5 years • Reusable packaging: 10 years
We recommend counting from the signature date and noting the expiration year on the file.
Technical documentation should include these types of supporting evidence: • Supplier's declaration of conformity or material declaration • Third-party test reports • Material specification sheets, SDS • Internal assessment documents (for example, calculations and explanation of reduction assessment)
If any item lacks supporting evidence, that declaration should not be formally signed and sealed for use.