Auditing a Packaging Material Supplier: A Practical Checklist for Pharmaceutical Buyers

Supplier questionnaires and certificates tell you what a supplier claims. An audit shows you what actually happens on the production floor. For pharmaceutical packaging materials, where a material change can invalidate stability data and regulatory filings, that difference matters.

Why Audits Are Expected

Regulatory frameworks increasingly require manufacturers to qualify their suppliers on a risk basis. For primary packaging materials, the expectation is not simply that certificates exist, but that the supplier's controls have been reviewed and that responsibilities are defined in a quality agreement.

The practical trigger for an audit is usually one of: a new material qualification, a change of manufacturing site, a repeated quality issue, or a periodic requalification cycle.

Before the Audit

Preparation determines how much value an audit delivers. Request and review in advance:

• Quality manual and certificates — the scope of certification and the site it covers
• Site master file or equivalent — production flow, equipment list, and area classifications
• Change control procedure — how customers are notified of material, process, or site changes
• Deviation and complaint procedure — including investigation records and response times
• Certificates of analysis templates — what is tested and reported per batch
• Material composition documentation — additives, processing aids, and compliance statements

Reviewing these beforehand means the on-site time is spent verifying rather than reading.

On-Site: What to Verify

Four areas repay attention during the visit.

1. Production controls. Confirm that the process described in documents is the process running. Look at in-process checks, parameter recording, and what happens when a parameter drifts out of range.

2. Contamination control. For materials used with sterile or sensitive products, review material entry procedures, area classifications, gowning, and how finished goods are protected before packing. Our Annex 1 article covers the expectations involved.

3. Testing capability. Verify that release testing is performed with calibrated equipment, that methods are documented, and that retained samples are stored. Our certifications page describes the approach we take.

4. Traceability. Follow one finished batch backwards to its raw material lots. This single exercise reveals more about a supplier's systems than any document review.

Documentation and Agreements

Close the audit by confirming the paperwork that will govern the relationship:

• A quality agreement defining responsibilities on both sides
• The agreed specification, including test methods and acceptance criteria
• Change notification periods and the requalification trigger
• Complaint response times and investigation expectations

Common Findings

In practice, the most frequent gaps are predictable: change control that exists on paper but is not consistently applied, retained samples without defined storage conditions, and certificates of analysis that report values without stating the test method.

Closing the Audit

Record observations with clear ownership and dates, agree corrective actions, and verify closure before releasing the supplier for commercial supply. Re-audit after any significant change.

Our quality system, production infrastructure, and documentation package are described on the About page and the certifications page. To arrange a supplier audit or request our documentation pack, contact our quality team.