Delta Black is a 60x60 CM double charge tile that pairs a polished finish with a dark marble look. The face is deep charcoal and black, worked through with swirling bands of grey, scattered white flecks and faint rust-brown streaks that flow diagonally across the tile. Other colours in the Delta collection are White, Blue, Brown, Gold and Grey. Water absorption is < 0.05% (ISO-10545-3) and breaking strength is > 2200 N (ISO-10545-4), with modulus of rupture of > 40 N/mm2 (ISO-10545-4). Surface abrasion resistance is Class PEI 4 (2100 revolutions) (EN 154), scratch hardness is 5 on the Mohs scale (EN 101) and glossiness is > 70% (Gloss meter 60°). Frost resistance is a pass (ISO-10545-12), and reaction to fire is Class A1 - A1 fl.