Magnesium Oxide Board Interior Wall and Ceiling contains no nasty chemicals, no gypsum, no cement based content, no formaldehyde. 100% sustainable, 100% compostable, Co2 negative, vapour permeable and non-combustible. High impact resistance and bracing performance embedded in every sheet. Independently tested and appraised. Combine with Forever breathe Paints and wall systems to retain vapor permeable performance.