GRG (glass fiber reinforced gypsum ceiling tile):

It's made from a high quality natural gypsum with a mixture of fiberglass. 

Technical Specifications:

Size:  595x595mm,603x603mm;  Fiber Content:  >80%

Sag Resist: 100% resistant;   Sound Absorption: 35db

Fire Performances:  A1 (flame speed 0-25); 

Type of backside:   plane backside; concave backside

Surface Treatment:   white Latex Painted or colorful without paper on the surface;