A batch number identifies the production run a tile came from, often a date, line and lot code. A shade code identifies the colour group the tile was sorted into within that run.
One batch can contain several shades, and the same shade code in two batches may not match. To be sure tiles will look the same on a floor, you need the same batch and the same shade, and for non-rectified tiles the same calibre too.
What the batch number tells you
Factories make a design in runs. Each run uses particular lots of clay, glaze and ink, and fires under particular kiln conditions. The batch number links a box to that run.
Formats differ between factories. Some print a production date and line number. Others use a lot code that only the factory can decode. Ask for the key, so you can read the codes on box ends and packing lists.
The batch number also gives traceability. If tiles fail on site, the factory can trace the run, its raw materials and its test records.
What the shade code tells you
Within one run, tiles still vary slightly in colour. After firing, the factory sorts them into shade groups and marks each group with a code. The codes are often numbers or letters, and their meaning is set by the factory.
Shade codes are not universal. Shade 2 in one batch is a sorting group inside that run, not a fixed colour. It may differ from shade 2 in the next run. That is why a shade code without a batch number does not guarantee a match. See shade variation for how sorting works.
The marks on a typical box
- Design name or code, and size.
- Grade, such as Premium or Standard.
- Batch or lot number.
- Shade code.
- Calibre code, for non-rectified tiles. See calibre and size variation.
- Number of tiles, square metres and weight per box.
Why it matters for your order
If a shipment of one design arrives with two batches, or two shades in one batch, you may not be able to sell it to a single customer for one floor. You then hold part-stock that is hard to clear.
Write the rule into the purchase order: one batch, one shade and one calibre per design. If a factory cannot supply the full quantity from one batch, it should tell you before loading, so you can decide how to split it. The broader loading checks are in avoiding mixed grades in a tile shipment.
Repeat orders and spare stock
Reordering the same design later almost always means a new batch. The new batch may be close to the old one, or it may not. Ask the factory to send a sample from the new batch before production is packed, and compare it with tiles from the old batch.
Tell your customers to buy a few spare boxes from the same batch and shade. Keep a record of batch and shade numbers for each project you supply, so you can match them later if needed.
Next step
Reading batch and shade codes is simple once you have the factory's key. We record batch, shade and calibre for every pallet we see loaded and send you the list. Book a free sourcing review to set this up.