GFRC made of cement, glass fibers, sand and water is non-combustible and meets the requirements of ASTM E136.  When used as surface material, its flame spread index is zero.  In addition, tests for non-combustibility, ignitability, and fire propagation have been conducted in England in accordance with the appropriate British Standard on "Fire Tests on Building Materials and Structures,"  BS 476, Parts 4,5, and 6. 

GFRC made with an acrylic thermoplastic copolymer dispersion for curing purposes will meet the requirements of NFPA Class A and UBC Class I when tested according to ASTM E84, resulting in a "0" Flame Spread Rating and less than 5 smoke density. 

GFRC panels can be designed to provide one or two hour fire rating.  The rating as defined in ASTM E119 is primarily dependent upon the fire endurance of the insulation and sheetrock materials field applied to the panels by other trades.  Fire tests conducted in the U.S.A. (Table 2) on GFRC wall panels with stud frames are summarized in ICBO Evaluation Report 4359. 

It should be noted that the tests were conducted in accordance with ASTM E119, which requires hose stream tests in additional to fire resistance tests.