Mineral Fiber Board:

http://www.prancebuilding.com/portfolio-item/hospital-lobby/ 

Smooth textured Prance Mineral Fiber Board provides excellent acoustical absorption, light reflect and durability including impact, scratch and soil resistance. Prance offers Mineral Fiber Board ceiling system with no sag performance, are resistant to surface growth of mold and mildew and can be recycled at the end of their usable life. 

Mineral Fiber Board,acoustic mineral fiber board,smooth texture mineral fiber board