The listing of the filler doesn't tell anything about how it will behave under fire conditions unless it is used on the job exactly the same way as it was tested. A laboratory listing does not indicate that the product can be used in light frame or common residential construction. Residential construction has its own set of testing issues for firestopping fillers. Mineral wool can be used as a 1-hour firestop. Some mineral wool melts and gets out of the way of the fire at 900 degrees.
Most mineral wool used in construction has a low melting temperature.
Mineral wool alone does not ever pass required hose stream testing. Mineral wool does not stop the passage of toxic gases, the primary killer in actual fire conditions. In such applications, the caulk itself may be nothing more than a combustible sacrificial material used to stop water on the cold side of the test assembly. When a Fire Marshal or Building Inspector approves a non-compliant product for an application, the contractor is not responsible in the event of a subsequent fire. Firestopping is addressed after the mechanical penetrations and devices are installed.