FS 3000 Spray Firestopping Sealants Data Sheets: (MSDS, PDS, etc…)Product Data SheetElastomeric, Sprayable Firestop FlameSafe® FS 3000 is a water based, elastomeric firestop that is designed for spray applications onto construction joints and curtain wall joint assemblies. FS 3000 cures to form a flexible membrane seal. The FS 3000 has been tested to dynamic conditions in accordance with ASTM E1399 relating to seismic, wind sway and thermal expansion/contraction environments. Sound Transmission Class (STC) Rating 62. The ease of application provides an efficient way to firestop.