A new powder succeeding in its first build does not by itself show that it will give the same result in series production. In medical and dental applications, the evaluation must cover material documents, the production process and final part requirements together. The approach that makes the purchasing decision easier is to write the acceptance criteria before placing the order.
A datasheet and a CoA answer different questions
A technical datasheet can give a general description of a product and its typical properties. A batch certificate of analysis (CoA) contains results for the delivered production batch. The product code, batch number, test method, measurement result and acceptance limit on the document must match. A general brochure does not provide traceability of the delivered packaging.
Chemical composition and the required interstitial elements, particle size distribution, particle shape, flow behaviour and density measurements are selected according to the application. ASTM F3049 is a starting framework for characterisation methods; it does not give a single pass/fail limit for all alloys and machines. Do not directly compare two results obtained with different measurement methods.
A suggested five-stage evaluation
- Document review: check the actual production site, the scope of quality certificates, the intended use of the product and the safety data sheet.
- Incoming inspection: record packaging integrity, label, batch number and defined test results; set aside a retention sample if required.
- Machine trial: evaluate powder spreading and build behaviour with defined parameters and specimens.
- Part validation: measure dimensions, required mechanical properties, surface and other relevant acceptance criteria in the post-processed condition.
- Repeatability: examine different production batches and repeat builds according to an approved sampling plan; separate a successful pilot from the series production decision.
Combine the reuse record with the production record
How many times a powder has been used is not a sufficient record on its own. Sieving, virgin powder additions, storage, exposure conditions and the approved procedure by which batches are blended must also be tracked. Do not assume a single reuse count valid for every alloy. Acceptance limits must be set by the machine manufacturer’s and the device manufacturer’s validated process.
Example scenario: a dental production centre is trying a new CoCr supplier. The current product is kept as a reference; the batch used in the pilot and the post-processing flow are recorded. The same checks are then repeated with another production batch. If geometric fit improves but finishing time increases, the decision is not based on print success alone.
Certificates, device approval and change control
ISO 13485 is a quality management system standard; it is not a general approval to use a specific powder in all medical applications. The FDA also explains that material evaluation is carried out in the context of the final device and its intended use. FDA: device manufacturing process and material evaluation.
The supply terms should state when the customer will be notified if the production site, feedstock, atomisation, sieving or blending practice changes. An unannounced change under the same product name can blur the scope of previously generated evidence. The responsible quality and regulatory team should assess the effect of a supplier change on the existing device file.
A short checklist to add to your quote request
Product grade and standard; machine and process; particle size acceptance limits; quantity; sample CoAs from three separate production batches; safety data sheet; applicable product documents; sampling plan; production change notification and nonconformity process. Asking for three CoAs is a useful first screening, not proof of statistical adequacy by itself.
Create a quote request with your technical requirements. Specify the application and the required document scope without sharing patient data. For other use cases, see the medical and dental guide.