Unfaced ROCKWOOL Slabs are non-combustible when tested in accordance with IS 3144, BS 476 (part 4), ISO 1182 and ASTM E136 and are classified as Class A1, in accordance with European norms. Unfaced, FSK and ALG-faced RB Slabs have the following fire safety rating achievements:
- Class 1 surface spread of flame in accordance to BS 476 (part 7)
- Class 0 in accordance to the BS 476 (part 6 & 7) and to British Building Regulations.
- Surface burning characteristics in accordance to ASTM E84 / UL 723
a: Fire Spread Index: Less than 25
b: Smoke Developed Index: Less than 50