09/05/2026
Before you sign a contract with any sealing supplier — ask for these 7 documents.
Most packaging failures don't start on the production line. They start at the sourcing stage, when a supplier is selected based on price alone, without asking the right questions. If you're purchasing cap seals for food, pharmaceutical, or chemical products, here are 4 documents you should request from any supplier before signing:
1. Technical Data Sheet (TDS)
Provides the detailed technical specifications of the liner material, such as thickness, structure, sealing temperature range, compatibility with different container materials, and performance characteristics. This document helps buyers verify that the seal is suitable for their specific application and filling conditions.
2. Food Contact Compliance Certificate — FDA 21 CFR (US) or EC 1935/2004 (EU/export) confirms the liner is safe for direct food contact.
3. ISO Food Safety Management Certificate — confirms the manufacturer operates under a documented quality system and demonstrate its ability to control food safety hazards in order to ensure that food is safe at the time of human consumption.
4. HACCP Certification - an internationally recognized standard that defines the requirements for the effective control of food safety
5. RoHS Compliance (Restriction of Hazardous Substances)
Confirms that the materials used in the liner do not contain restricted hazardous substances such as lead, mercury, cadmium, hexavalent chromium, and certain flame retardants above permitted limits.
6. REACH Compliance (Registration, Evaluation, Authorisation and Restriction of Chemicals)
Ensures that the materials used comply with European chemical safety regulations and do not contain substances of very high concern (SVHC) above regulatory thresholds.
7. Material Safety Data Sheet (MSDS) — confirms chemical composition and safety of liner materials in contact with your product.
Save the checklist graphic below for your next supplier evaluation