This is a floor that we strongly recommend for external floors under weathering. Due to his high roughness and opacity and strong derived anti-slip nature. The flaming process is an additive final treatment that change the floor texture surface. The final granite layout is flamed using a acetylene and oxygen flame to cause a  superficial, blast that strongly increase the surface roughness. Strongly recommended for square, food part, platforms, swimming pole, staircase all surfaces subject to the direct weathering. 

Public enviroment europeannormative: DIN 51130 ® 
Bs 8298-2 Code of practice for the design and istallation of natural stone cladding and lining