Which factor influences the qualification test for refractory shelf life?

The qualification test for refractory shelf life is primarily influenced by time limits and the manufacturer's recommendations. These factors are critical because they establish how long a refractory material can be stored before it is considered unusable or ineffective. Manufacturers typically provide guidelines that specify the maximum shelf life for their products based on chemical stability, curing requirements, and performance characteristics.

Understanding these parameters helps ensure that when the material is eventually used, it will meet the necessary performance specifications and structural integrity required for the application. This aspect of qualification is essential for maintaining quality standards in refractory installations, as using materials beyond their recommended shelf life can lead to failures in the application due to changes in the material properties over time.