A ceramics factory audit is not a general factory tour; the category fails in specific places, and the audit should visit exactly those places. Kilns, the glaze lab and the packing line predict your shipment more than any lobby or showroom. This checklist walks a buyer or third-party inspector station by station through what to see, what to ask and what passing evidence looks like.
Audit by station, not by impression
Showrooms are designed to impress; production floors are designed to produce. An effective audit moves through the physical sequence a plate follows, body preparation, forming, firing, glazing, decoration, inspection and packing, and judges each station on records rather than remarks. Spend the most time where ceramics programs most often fail: firing control, glaze chemistry and packing. Everything else can be sampled; those three decide whether the shipment survives both the kiln and the container.
Station checklist
| Station | Ask to see | Passing evidence |
|---|---|---|
| Body preparation | Slip and clay storage, recipe control, body batch records | Documented recipes per body type; batches identified and traceable |
| Forming | Mold condition and maintenance log, press or casting lines | Mold inventory with repair records; dimensional checks on fresh pieces |
| Kilns | Kiln types, firing curves, temperature logs, loading plans | Logged firing within the body's window; fine porcelain typically 1280–1380°C |
| Glaze lab | Raw material and frit storage, glaze batch records, testing bench | Batch-coded glazes; in-house testing; migration-test literacy |
| Decoration | Decal application, hand-paint benches, separation of glaze systems | Underglaze and on-glaze lines separated; first-off pieces kept per run |
| Inspection | Sorting criteria, defect samples board, AQL-style sampling records | Written criteria referencing golden samples and defect limits |
| Packing line | Individual boxing, cushioning materials, carton sealing, palletizing | Specified cushioning per SKU; drop-test practice; IPPC-compliant crating for sea |
Kilns: where the body earns its grade
Firing is the step buyers cannot see in the product, so audit the records. Ask which kiln types run which bodies, and ask to see firing curves and logs, not just the instrument panel. Fine porcelain bodies typically fire in the 1280–1380°C window and bone china around 1380°C; a plant that fires porcelain far below that window is making a different product at a different price. Ask how kiln position is handled, since temperature gradients across a car produce warping and tone variation at the edges, and ask what happens to fired pieces that fail: a disciplined plant can show you its defect board and its rework or scrapping records without hesitation.
The glaze lab: the room that predicts your compliance
The glaze lab tells you whether food-contact safety is manufactured or purchased. Look for raw material and frit storage with identification, glaze batch records that tie a production run to a glaze batch, and a working testing bench. Then ask the questions that require knowledge: which lead and cadmium limits apply in your destination market, which test method the plant uses, and how decorated rims are controlled. For US programs the answers should reference FDA 21 CFR 109.16 with ASTM C738 testing; for EU programs, EC 84/500/EEC with the 2005/31/EC declaration-of-conformity obligations. A plant that runs underglaze decoration can explain, in its own words, why sealed color lowers migration risk structurally. If the answers here are thin, no amount of showroom polish compensates, and the compliance pages list the exact limits to check the answers against.
Packing line: where the margin survives the container
Fragile goods without professional packing run roughly 5–8% breakage by industry and insurer convention, and 34% of packaging-related returns trace to damage, which makes the packing bench a financial station. Watch how pieces are individually boxed, what cushioning goes between nested items, how cartons are sealed and stacked, and how pallets are crated for sea freight with IPPC-compliant timber. For platform inbound programs, ask whether the line packs to a 125 cm drop standard, face, edge and corner, and whether the claim is backed by recorded tests. A plant that cannot show its packing specification will also be unable to defend a damage claim on your behalf, so this station doubles as a test of the claims process.
Scoring and follow-up
- Score stations separately. A plant can be strong in firing and weak in packing; a single overall grade hides exactly the gap you needed to find.
- Photograph records, not just equipment. Temperature logs, glaze batch sheets and packing specs are the audit's real output.
- Convert findings into conditions. Each gap becomes a written condition in the purchase order, with the corrective step named.
- Re-verify at first production. The pre-production and pre-shipment inspections check whether audit conditions held under real schedules.
An audit is also the fastest way to compare clusters on substance rather than reputation, which is why we fold it into the process described on the sourcing desk. Hospitality buyers running tender programs can see how audit evidence feeds supplier selection on the hospitality solutions page.
Frequently asked questions
Can an audit be done remotely?
A structured live video walkthrough covering kilns, glaze lab and packing line catches most structural issues and is far better than no audit. It weakens on records, since a camera can be steered, so for compliance-sensitive or high-value programs, commission an in-person or third-party audit and ask for photographs of the logs.
How long does a ceramics factory audit take?
A focused single-day visit covers the seven stations in the checklist with time for records. Programs with custom glaze work, decoration complexity or platform inbound packing deserve more, because each adds stations worth checking beyond the core line.
What single finding should stop the program?
An absent or evasive glaze lab. Firing and packing problems show up as losses that can be negotiated; uncontrolled glaze chemistry shows up as failed migration tests against 21 CFR 109.16 or 84/500/EEC, which no negotiation at destination can repair.
Does a passed audit remove the need for inspections?
No. The audit says the plant can produce to standard; the inspections say this shipment did. Golden sample checks, packing verification and migration reports remain part of every program regardless of how well the audit went.
