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What we check, and when
Alumina linings fail quietly when a batch is under-fired, porous or out of tolerance. We put acceptance terms in the order and check the goods in Zibo before they are packed.
Before production
Grade, dimensions, tolerances and acceptance terms are agreed in writing with you and passed to the factory before production starts. Where a duty is new to us or to you, we suggest a sample or a trial quantity first.
| Item | What we write into the order |
|---|---|
| Visual defects | Cracks, chips, bubbles and iron spots: what is rejected outright, and how many minor defects are allowed per carton |
| Dimensions | Tolerances on length, width and thickness; hole position on weld-on tiles; fit to your drawing |
| Density | Sampling plan and minimum bulk density for the grade (tiles, bricks, balls) |
| Assemblies | Lining continuity and joints in pipes; flange alignment; rubber-to-ceramic and rubber-to-steel bonding in panels |
| Packing and marking | Cartons on pallets or wooden cases, ISPM-15 treated wood, marking per your instructions |
Why we write it down
A factory’s default acceptance standard can be looser than a buyer expects. Agreeing the terms before production avoids arguments after it.
Before shipment
- Check dimensions against the drawing on samples from each item.
- Visual check against the agreed defect limits.
- Bulk density by the Archimedes method on samples from the batch, where density is part of the order.
- Check packing and marking, and photograph the goods and the loading.
Third-party inspection (for example SGS or Bureau Veritas) can be arranged at your request and cost.
Photos: Partner factory, Zibo · October 2026. Inspection and loading photos are sent with each order.
Download our inspection checklist (Excel)
Documents
- Commercial invoice and packing list.
- Certificate of origin.
- Our inspection record with photos.
- Factory test report, where specified in the order.
If something is wrong
We are in Zibo, a short drive from the factories. We investigate with the factory and propose a remedy. What we commit to — replacement, credit or other — is stated on the quotation, so there is no ambiguity later.
Ask for the inspection checklist.
See what a pre-shipment check covers for your product before you place an order.
- inquiry@vuulcan.com
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- Based in
- Zibo, Shandong · FOB Qingdao