F-rating

F-rating

A fire performance rating of a fire-stopping system, measured in terms of period of time that the system will limit the passage of fire through it when tested according to the applicable code.
References in periodicals archive ?
Fire Stop, a four-hour fire-rated silicone sealant with F-rating (flame), T-rating (thermal) and L-rating (smoke), can resist fire up to 750 deg C.
As a state legislator, Wendy earned an F-rating from the NRA by voting against the Second Amendment repeatedly," said NRA spokeswoman Catherine Mortensen.
independent advisor Governance Metrics International had consistently given the company an F-rating, "only because there is no lower grade.