Engineering Answers / Compliance & Documents
A certificate proves an audit happened to a scope. It does not prove the scope covers your part, that the cleanroom is the class claimed, or that you will hear about a compound change before your validation breaks.
An ISO 13485 supplier should be able to show a certificate whose scope names silicone molding and the devices it covers, process validation records for the specific process (IQ, OQ, PQ), cleanroom classification and monitoring data, bioburden and environmental results, lot traceability from compound lot to shipped part, a documented change-notification clause, and CAPA records. The certificate alone says a system exists; those seven items say the system is applied to your part.
Every medical silicone supplier has an ISO 13485 certificate. It is the entry ticket, not the evidence.
What the certificate tells you is that an accredited body audited a quality management system against the standard, on a particular scope, on a particular date. What it does not tell you is whether that system has been applied to your part, whether the cleanroom is the class claimed, or whether you will be told when something changes.
| Item | What it proves | Red flag |
|---|---|---|
| Certificate with scope statement | The system covers silicone molding for medical devices | Scope says "trading" or excludes molding |
| Process validation: IQ, OQ, PQ | The process is proven across its window, in routine production | Only IQ, or validation on a different tool |
| Cleanroom classification and monitoring | The environment is the class claimed, and it is measured | A certificate for the room with no particle data |
| Bioburden and environmental results | Microbial state is controlled and trending | A single result, no trend, no sampling plan |
| Lot traceability, compound to shipment | A defective lot can be contained | Traceability starts at the press, not the compound |
| Change notification clause | You hear about changes before they reach your product | "We will inform customers as appropriate" |
| CAPA records | Problems are investigated and closed | No CAPA history, or "no complaints ever" |
Certificates are issued against a scope written by the supplier and agreed with the certification body. That sentence is the part that matters, and it is the part buyers skim.
Look for the activity (manufacture, not distribute), the product category (medical devices, or components for medical devices) and any exclusions. A scope that says "manufacture of silicone rubber components" without the medical qualifier is a different claim from one that names medical devices explicitly, even where both certificates carry the same standard number.
Also check the certification body: an accredited body with an IAF member mark is verifiable. A certificate issued by an unaccredited body is a document, not a certification. The body's number and the certificate's validity should be checkable on the body's own register, and that check takes two minutes.
Process validation is where a moulder's medical capability actually lives, and where the documents are most often thin.
A supplier with a single validation report at nominal conditions has demonstrated that the process can work. They have not demonstrated that it will keep working when a thermocouple drifts.
Ask one question: if a compound lot turns out to be wrong, which shipped cartons do you recall?
A good answer walks backward from the compound lot through the press record, the lot number, the inspection record and the shipment. A weak answer starts at the press, which means the moulder knows which parts they made but not which material went into them.
For a medical device customer this is not a documentation preference. It is the difference between a containment that takes a day and one that takes a recall.
Change notification, mutual, with a defined notice period before implementation. Compound grade, cure system, pigment, tool, process window and site all trigger it. The reason is not administrative: a customer's biocompatibility file and process validation are tied to a specific material and process. Changing either quietly does not create a better part, it creates a validation gap that surfaces at the worst possible moment — usually during a notified body audit of the customer, not of us.
Five questions, most of an afternoon. They separate a supplier who holds a certificate from one who runs a medical process — and the difference only becomes visible when something goes wrong, which is precisely when it is too late to check.
No. A certificate has a scope, and the scope has to name the activities and the product categories covered. A supplier certified for "manufacture of silicone components for medical devices" is covered for that; a supplier certified for industrial silicone with medical listed as a future activity is not. Ask for the certificate and read the scope sentence aloud, then check whether it matches what you are buying.
Installation qualification confirms the equipment and tooling are what they should be, and installed correctly. Operational qualification proves the process produces conforming parts across the intended window — the upper and lower limits of temperature, pressure and cure. Performance qualification proves it does so in routine production, over multiple lots, with the people and the procedures that will actually run it. A supplier who only has IQ is at the start of validation, not the end.
Because a compound change is invisible in the part and invalidates the customer's own validation. If the moulder switches compound lot, cure system or a pigment without telling you, your biocompatibility data and your process validation were performed on a material that no longer exists in the supply chain. The clause should say what triggers notification and how many days' notice you get — and it should be mutual, because your design changes have the same effect in the other direction.