FIRM-FILL CMDSpecifically formulated for buildings with cold-formed steel frame construcitonAverage thickness of 1 9/16 in.Minimum compressive strength of 3,500 psiUL-rated for 1 to 2 hour fire ratings Request More Info Fill out the form below to request more information about FIRM-FILL CMDSpec & Compare.More From Hacker Industries IncConcrete Flooring Products & Equipment May 2009Products and equipment for concrete contractors doing concrete flooring, grinding and polishing.TRUE-SCREED CLU