fischer FFSC is a specially formulated gypsum based compound, which when mixed with water can be trowelled or poured around service penetrations in either vertical or horizontal applications. Tested to EN1366-3 and UL1479, the FFSC can provide up to 4 hours integrity and insulation. It has been designed to set within 30-45 min depending on ambient temperature, and is capable of accommodating foot traffic within 72 hours.