After laying the tiles are to be polished with rubbing bricks. Tiles are grinded and lightly polished in the factory but in addition they are again ground and grout and given a final polish after they are laid. This on site finishing process has the advantage that any slight lipping at the joints and slight variation from the dead level surface can be adjusted after laying without any harm to the tiles. it must however be emphasized that the final grinding and polishing only currects very small deviations and must not be considered as a natural currctive process for distorted tiles or poor laying. Proper method should be adhered for final polishing of tiles. Following chart will help in assessing the sequences of rubbing bricks.

80 nos. brick! Grouting with same cement slurry& curing for 3 days time! 100/120 nos. brick!240/ff no. Brick! 400 nos. brick with oxylic acid granuals!floor to be dried!use mansion polish 1st coat!use mansion polish 2nd coat after 2 days!use buffer or blade to scrap the excess polish

Plastic cracking or thermal cracks in tiles:

This is quite a common phenomenon of ordinary portland cement to show thermal cracks on the first layer of tiles popularly known as plastic cracks or fine cracks. These fine cracks are usually straight and short and developes in the tiles kept un used. They are often transverse in direction. Several of the cracks are parallel to each other and spacing can vary from 2-3 cms to 5-6 cms. And some time even more. These cracks are shallow and seldom penetrate below the top lever (first layer) of tiles. Unless it is very severe showing permanent weakened surface, it does no real harm if the cracks are grout and polished. these cracks do not tamper the strength or any other property of tiles. Even the general quality of tiles as mentioned is: 1237-1959 that hair cracks is not included as cracks in the wearing face of mosaic tiles. The hair cracks vanishes after grouting and polishing of the floor.