In accordance with the British Standard (BS EN 1339/2003), the tile size 60x400x400 mm should achieve the limit set forth in the specifications 28 days after production as follows:
Transverse strength: not less than 3.5 Newton/mm2 for any sample.
The tiles of the Industries achieve the stipulated strength in the specifications after one week of production. It reaches the highest strength stipulated in the specifications 28 days after production only.
The thickness of the tile for public squares that is smoothed is less than the regular tile thickness by 5 mm.