Technical specification Characteristics Floor Mothod of testing European standards En 1778 11a, is 13755 Coral Floor tiles specification Physical dimensions 1. Deviation in length +âGÇÜpéG¦ 0.5% max. +âGÇÜpéG¦ 0.5% max. En 98, bs 6431 part 10, is 13630 part 1 2. Deviation in thickness +âGÇÜpéG¦ 5.0% max. +âGÇÜpéG¦ 4.0% max. - same as above 3. Straightness of sides +âGÇÜpéG¦ 0.5% max. +âGÇÜpéG¦ 0.3% max. - same as above 4. Rectangularity +âGÇÜpéG¦ 0.6% max. +âGÇÜpéG¦ 0.3% max. - same as above 5. Surface flatness (warpage) +âGÇÜpéG¦ 0.5% max. +âGÇÜpéG¦ 0.5% max. - same as above 6. Suirface quality Minimum 95% of tiles free from defects Minimum 98% of tiles free from defects - same as above Physical properties 1. Water absorption (%)(e.) 3%