Relationship between Surface Abrasion Wear and Brightness in Glazed Porcelainized Stoneware Tiles

Table 2

Brightness and scratching resistance of the tested samples.

Composition	λ = 0 mm		λ = 0.25 mm		λ = 0.35 mm		λ = 0.61 mm		λ = 0.68 mm		λ = ∞
	𝑓ac = 100%		𝑓ac = 23.1%		𝑓ac = 19.8%		𝑓ac = 10.9%		𝑓ac = 6.1%		𝑓ac = 0%
	B	M	B	M	B	M	B	M	B	M	B	M
P	8.5	5	69.5	7	73.5	7	77.8	<7	84.8	<7	96.2	4
P10C	3.6	7	33.5	9	52.2	7	59.1	<7	64.3	<7
P20C	6.4	6	42.8	8	71.2	9	72.6	<7	75.8	<7

λ: mean free path; 𝑓_ac: fraction area coated with glaze.