This checklist helps buyers verify that a molder maintains complete quality documentation. It covers records, traceability, and audit readiness to ensure medical device manufacturing meets regulatory expectations.
- Check for complete traceability from raw material to finished part.
- Verify that the molder maintains current quality management records.
- Review deviation handling and corrective action records.
- Confirm that personnel records support the claimed training.
Medical device buyers face a high bar for documentation. Regulators and customers expect a molder to prove that every part is made under controlled conditions. A verbal assurance is not enough. You need a paper trail.
This checklist is for buyers who need to confirm that a molder maintains complete and compliant quality records. It is not a substitute for a formal audit. It is a pre-visit or pre-contract tool.
1. Verify the Quality Management System
Start with the foundation. Ask for the current version of the Quality Manual. Confirm it aligns with ISO 13485.
The manual should outline roles, responsibilities, and document control procedures. It should not be a generic template. Look for specific references to your product family. For example, if you are buying molded catheters or surgical trays, the manual should reflect the specific environmental controls required for those items. A manual that only lists general quality principles without referencing your product type is a weak indicator.
Check the document control log. Every record should have a version number, an effective date, and a revision history. Outdated documents are a red flag. They suggest the molder is not actively managing its records. If the manual lists a process that the machine shop no longer uses, the system is not live. You want to see a document register that shows which procedures are active, which are obsolete, and who approved the changes. This register is the spine of the quality system. If it is disorganized, the rest of the documentation will likely be unreliable.
2. Confirm Traceability Records
Traceability is the core of medical device quality. You need to know where every part came from.
Request a sample traceability record for a recent batch. It should link the lot number to the following:
- Resin lot number and date of manufacture
- Mold number and cavity number
- Machine identifier and cycle count
- Operator ID and date of operation
- Inspection results and final disposition
If the molder cannot provide a chain of custody from raw material to shipment, pause the evaluation. Gaps in this chain mean you cannot recall a specific lot if a problem arises. For instance, if a defect in a resin lot causes a clouding issue in a clear polycarbonate housing, you need to know exactly which machines and molds used that specific lot of material. Without that link, a recall becomes a guess rather than a targeted action.
Pay close attention to the cavity number. In multi-cavity molds, cavities can behave differently over time due to wear or heat distribution. If the traceability record only lists the mold number and not the cavity, you lose the ability to isolate defects to a specific injection point. A robust traceability record allows you to pinpoint issues to a specific cavity, machine, or shift.
3. Review Process Validation Records
Injection molding is a controlled process. The molder must prove it runs the process consistently.
Ask for the Process Validation Plan and Report for a typical product. The plan should define the critical to quality characteristics. The report should show the data collected during the validation runs.
Look for capability studies. You want to see that the process capability index meets the required tolerance. If the data shows the process is marginal, ask how the molder compensates. A capability index that is just above the minimum requirement suggests the process is unstable. Small shifts in temperature, pressure, or material moisture can push parts out of tolerance. You want to see a process that is comfortably within the limits, not one that is scraping by.
Red flags include missing control charts, missing capability data, or reports that are significantly older than the current production run. The process may have drifted. If the validation was performed two years ago and the machine has undergone maintenance or the mold has been reworked, the old data is no longer valid. Ask for a revalidation summary or recent capability studies that reflect the current state of the equipment.
4. Check Resin and Material Documentation
Medical grade resin is not just a material. It is a regulated substance.
Request the Certificate of Conformance for the specific resin lot used. It should list the chemical composition and purity. For medical applications, look for evidence of compliance with biocompatibility standards.
Cross-reference the resin lot on the mill certificate with the lot number on the production records. They must match. A mismatch is a critical failure. It means the molder may not be tracking materials correctly.
If the molder uses recycled material, ask for the recycling process documentation. Regulators require strict controls on recycled content. Recycled material can contain contaminants or degradation products that affect the performance of medical devices. The documentation should detail how the recycled content is processed, tested, and integrated into the final product.
5. Inspect Inspection and Test Records
Every part must be inspected. The molder must record what was checked and what was found.
Ask for the Inspection Plan and Procedure. It should define what to measure, how to measure it, and how often. It should reference the relevant standards.
Review the inspection logs. They should show pass or fail results for each unit or lot. Look for records of dimensional checks, visual inspections, and functional tests.
If the molder only records “passed” without data, that is a red flag. You need the actual measurements. If a part fails, there must be a record of the failure.
6. Evaluate Deviation and Corrective Action Records
Things go wrong. How the molder handles problems is a strong indicator of its quality culture.
Request the nonconformance report log. It should show how deviations are identified, contained, and investigated. Look for the root cause analysis.
Ask about the corrective actions taken. Did they change the process? Did they retrain staff? Did they update the design?
A molder that only corrects symptoms without addressing root causes is a risk. You want to see a pattern of effective corrective actions.
7. Verify Personnel Training and Competency
People execute the process. The molder must prove its staff are qualified.
Ask for the training matrix. It should list each employee, their role, and the training they have completed. Check the dates. Training should be current.
For medical molding, look for specific training on cleanroom practices, material handling, and equipment operation. Ask for the competency assessments. Did the employee pass the test?
If the molder cannot prove that the person who ran the machine was qualified, the quality of the part is in doubt.
8. Assess Record Retention and Audit Readiness
Records must be kept for a defined period. Ask about the retention policy. It should align with the shelf life of the device and regulatory requirements.
Check the storage method. Records should be secure and accessible. If they are only in a physical binder in a corner of the office, that is a risk. Digital records are easier to manage and audit.
Ask about their internal audit schedule. They should audit their own processes regularly. Request the last internal audit report. It should show that they identify and fix issues before a customer or regulator finds them.
Quick Reference Table
| Document | What to Look For | Red Flag |
|---|---|---|
| Quality Manual | Current version, ISO 13485 alignment | Outdated or generic template |
| Traceability Log | Resin to part chain of custody | Missing lot numbers |
| Process Validation | Capability data, control charts | Marginal capability |
| Resin Certificate | Chemical composition, biocompatibility | Lot mismatch |
| Inspection Logs | Actual measurement data | Only pass/fail status |
| Corrective Action | Root cause, effective fix | Repeated failures |
| Training Matrix | Current dates, competency tests | No training records |
Final Verification Steps
Before signing a contract, run the numbers. Compare the dates on the documents. They should match. If the resin certificate is from 2024 and the production run is from last month, something is off.
Ask for a sample of the final inspection report. It should be signed and dated. It should reference the specific lot.
If the molder hesitates to provide these records, that is your answer. You do not need to push. A compliant molder will welcome the request.
Common Mistakes Buyers Make
- Accepting verbal assurances. Always ask for the document.
- Ignoring the dates. An old report is not a current process.
- Skipping the traceability check. If you cannot trace it, you cannot control it.
- Overlooking personnel records. The machine is only as good as the operator.
Use this checklist as a conversation starter. It helps you ask the right questions. It also gives you a baseline to compare different molders.
The goal is not to find fault. The goal is to verify capability. A molder with strong documentation is a molder you can trust.
Frequently asked questions
Do I need to see the actual physical records?
No, digital records are acceptable if they are secure and accessible. Focus on the content and completeness of the data, not the medium.
How recent should the documents be?
They should reflect the current production process. If the process has not changed, older documents may be acceptable, but they must be current to the molder's operations.
What if the molder uses a third party for testing?
Ask for the Certificate of Conformance from the third party. It should be included in the traceability package.
Is a generic ISO certificate enough?
No. An ISO certificate confirms the molder has an ISO 13485 system. It does not prove your specific product is made to spec. You need the specific records for your part.
How often should I re-verify the documentation?
At the start of a new contract and annually thereafter. Re-verify after any major process change, material change, or significant deviation.
