Tile Crazing information
Not one of our tile colours are guaranteed against crazing, and we cannot say that any particular tile colour will exhibit this effect. But over an extended tile period some of our tiles tend to craze, especially the high gloss colours that are translucent.
This is slight cracking in the glaze which is normal and does not affect serviceability of the tile, and is usually caused by the small expansion of the tile body when wet. This is usually most apparent when the tiles are first laid, or after "slabbing"..being made into a fireplace. However it usually occurs to some degree with time. The commonest cause is expansion of the tile body due to moisture ingress, which produces these small tensile cracks in the glaze.
It does not affect the serviceability of the tile - the cracks are in the glaze only and not the body of the tile, and may lessen when the tile fully dries out .
The thickness of the glaze necessary to reproduce the high gloss glaze finishes also leads to increased likelihood of crazing, so crazing is very likely to occur in most of our glaze colours. The Ivory, Basalt black, Stockwell grey, 942 and burgundy glaze colours are less likely to show crazing effects, due to the different glaze formulas used in there formulation.