Which Documents Actually Matter
A seal or gasket shipment may need a certificate of conformance stating the part meets the drawing and specification, a material certification from the compound mixer or sheet manufacturer showing the batch passes physical properties such as hardness, tensile, elongation and compression set, and a cure date or manufacture date. Some customers also want test results on the specific lot: cure rheometer data, specific gravity, or fluid immersion results. For metal-containing gaskets, mill certs for the metal may be needed, and specialty-metal flow-downs can apply in defense programs.
For regulated end uses, certification to FDA, NSF/ANSI 61 or USP Class VI status belongs in the file. The key is to identify per customer what they require, not to produce every document for every order.
- Certificate of conformance tied to the order and part revision
- Compound or sheet material cert with batch identity
- Cure date or manufacture date per lot
- Regulatory evidence where required: FDA, NSF/ANSI 61, USP Class VI
The Chain: Raw Batch to Finished Lot to Shipment
Traceability breaks wherever one lot is blended or split without a record. Typical breakpoints in seal plants are compound batches cut into preforms that are stored together, multiple batches fed to one press during a shift, post-cure ovens loaded with mixed lots, and bulk packaging of finished parts from different runs. To be trustworthy, every step that mixes or splits must either keep lots separate or record exactly which lots went in.
Decide what a 'lot' means for each product family and enforce it at the shop floor with travelers, labels or barcode scans, not at the end in the office. If a tool changes mid-run, treat it as a new lot or record the changeover.
Run a Recall Drill Before You Need One
The best test of a traceability system is to pick a random finished lot, pretend the compound batch failed, and time how long it takes to list every affected lot, every customer and every shipment, plus the stock still on your shelf. Then do the reverse: pick a shipment and show its compound batch, press, operator, cure date and inspection record. Shops are often surprised that the forward trace takes days because certs live in email attachments and inspection data lives on paper.
Record the time, fix the gaps, and repeat twice a year. Auditors and primes value a documented drill more than a promise.
- Forward trace: compound batch to all finished lots and customers
- Backward trace: shipment to batch, press, operator and inspection
- Time the drill and log the gaps found
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Keeping Records Retrievable
Retention requirements vary by customer, industry and contract. Aerospace and medical customers frequently specify long retention periods in their quality clauses, so read the purchase order terms rather than assuming. Whatever the period, the records must be retrievable, not just stored.
A folder of scanned PDFs named by date is not traceable. Index certs by compound batch and by part and lot number, and keep the link in the ERP. Be careful with documents that carry export-controlled drawings or customer proprietary data; access controls and logging matter, and external AI tools should not receive them.
How AI Helps With Cert Packages and Trace Queries
Two practical uses. First, assembling a cert package: given an order, find the compound cert for the batch used, the lot's cure date and inspection record, and draft the CoC for a quality manager to approve. Second, answering trace questions in plain language over ERP data and the document archive: which lots used batch X, which of those shipped, to whom.
Running this privately, on your own hardware, means customer drawings and certs never leave your network. AI is not a substitute for capturing the data at the press. If the compound batch is never scanned at molding, no tool can reconstruct it.
When a Simpler Fix Is Enough
If your product is commercial-grade and customers rarely ask for more than a CoC, a consistent lot numbering rule, a labeled bin discipline, and a spreadsheet linking compound batch to finished lot may meet the need. Invest in system-level traceability when you serve regulated or aerospace markets, ship a lot of mixed-batch product, or have already had a customer complaint you could not trace quickly.
Frequently asked questions
What is a certificate of conformance for seals?
A CoC is a statement from the manufacturer that the shipped parts conform to the drawing, revision and specified standards. For seals it often references the compound or material spec and lot or cure date, and may attach compound test results.
How do I trace an O-ring back to its compound batch?
Record the compound batch on the molding work order, assign a finished lot at cure or post-cure, and link lot to shipment. Scanning labels at each step is more reliable than relying on end-of-run data entry.
How long should I keep seal and gasket lot records?
It depends on customer contracts and industry. Aerospace, defense and medical purchase orders often state retention periods. Check each customer's quality clauses and keep the longest applicable period for that product family.
Ask Netray to walk through a forward and backward trace on your own ERP and cert archive, run privately, so you can see where the chain breaks today.