PRODUCT PROPERTIES	EN 14411: 2006 (GROUP ΑIb Annex A)	ACCORDING TO STANDARD	OXYMAHON'S TEST RESULTS
Lenght and Width: - Average dimensional tolerance, in %, of one tile (2 or 4 sides) versus production dimension - Average dimensional tolerance, in %, of one tile (2 or 4 sides) versus the average dimension of 10 test specimens (20-40 sides)	± 1,00 ± 1,00	ISO 10545-2	± 0,75 ± 0,60
THICKNESS Average thickness tolerance, in %, versus production thickness.	± 10	ISO 10545-2	± 10
STRAIGHTNESS (visible side) Side straightness tolerance, in %, versus production dimension.	± 0,50	ISO 10545-2	± 0,40
RECTANGULARITY Square ness tolerance, in %, versus production dimension.	± 1,00	ISO 10545-2	± 0,75
FLATNESS Maximum tolerance, in %, from flatness: 1. Convexity or concavity, in %, versus diagonal length calculated from production dimension. 2. Warpage of sides, in %, versus production dimension. 3. Twist, in %, versus diagonal length calculated from production dimension.	± 0,50 ± 0,50 ± 0,80	ISO 10545-2	± 0,40 ± 0,40 ± 0,60
SURFACE QUALITY	At least 95% of tiles must not have visible deffects which may spoil the appearence of a great part of their surface.	ISO 10545-2	GUARANTEED
WATER ABSORPTION in %	3	ISO 10545-3	1,5
MODULUS OF RAPTURE (N/mm2)	Average value 23	ISO 10545-4	25
SURFACE HARDNESS Unglazed tiles	6	-	>7
WEAR RESISTANCE Resistance of unglazed tiles to deep abrasion: volume of material removed in mm3	275	ISO 10545-6	200
COEFFICIENT OF THERMAL LINEAR EXPANSION from room temperature up to 100oC Grey white - Dark grey Ochre - Red	4Χ10-6 Κ-1 to 8Χ10-6 Κ-1	ISO 10545-8	5,15Χ10-6 Κ-1 4,83x10-6 Κ-1
THERMAL SHOCK RESISTANCE	REQUIRED	ISO 10545-9	GUARANTEED