- Calibre
- The size group a tile is sorted into after firing. Tiles shrink slightly and unevenly in the kiln, so factories measure and sort them by calibre; tiles from different calibres should not be laid together. The calibre is normally printed on the carton.
- Shade (tone)
- The colour batch of a production run. Shade can vary from run to run, so cartons carry a shade or lot code. Order, store and lay one shade per area.
- Rectified edge
- An edge ground square after firing for precise dimensions, which allows narrower grout joints. Non-rectified (pressed-edge) tiles keep their kiln edge and usually need wider joints.
- Water absorption
- The percentage of water a fired tile body takes up under test. It is the main basis for classifying tiles: ISO 13006 groups dry-pressed tiles from BIa (0.5% or less) to BIII (more than 10%). Lower absorption means a denser body.
- Porcelain tile
- A dense tile with water absorption of 0.5% or less (ISO 13006 group BIa; ANSI A137.1 uses the same limit in North America). It can be glazed or unglazed.
- GVT
- Glazed vitrified tile: an Indian trade term for a low-absorption vitrified body finished with a glaze, usually carrying a digitally printed design. Whether it may be sold as “porcelain” depends on tested absorption and the destination market’s definition.
- PGVT
- Polished glazed vitrified tile: a GVT whose glazed surface is polished after firing to a high gloss.
- Lappato
- A semi-polished finish. The surface is partly polished, giving a soft sheen between matt and full polish. Check slip resistance if it will be used on floors.
- PEI rating
- A class (0 to 5) for the surface abrasion resistance of glazed tiles, tested under ISO 10545-7 using a method that originated with the Porcelain Enamel Institute. Higher classes suit heavier foot traffic. Unglazed tiles are tested for deep abrasion instead.
- R-rating
- A slip-resistance class from R9 to R13 based on the shod ramp test, formerly DIN 51130 and now EN 16165 Annex B in Germany. Higher numbers mean more slip resistance. Other markets use pendulum or DCOF tests, which do not convert directly.
- DCOF
- Dynamic coefficient of friction, measured in North America under ANSI A326.3. A wet DCOF of 0.42 or more is the benchmark for level interior floors expected to be walked on when wet; it does not make a tile suitable for every project.
- Incoterms®
- The International Chamber of Commerce rules (current edition Incoterms® 2020) that define which party pays for and carries the risk of each stage of delivery. FOB, CFR and CIF are sea and inland waterway rules; FCA, CPT and CIP suit any mode, including containers.
- MOQ
- Minimum order quantity: the smallest quantity a factory will produce or sell per design, size or order, often expressed in square metres or containers. It varies by product and is confirmed at quotation.
- FCL / LCL
- Full container load (your goods alone in a container) or less than container load (sharing a container with other shippers). Tile orders usually ship FCL; LCL can suit samples or small trial quantities but involves more handling.
- Pallet
- The base on which tile cartons are stacked, protected, strapped and wrapped for loading. Wooden export pallets generally need ISPM 15 treatment and marking.