What is one of the five requirements in Quality Standards?

One of the five requirements in Quality Standards is the Physical Property Requirements. This is critical because it ensures that the materials used in applications meet specific performance criteria, such as strength, durability, thermal stability, and other mechanical properties. These requirements are essential for ensuring the longevity and effectiveness of refractory materials under operating conditions. Meeting the physical property standards ensures that the materials perform as intended, provide adequate insulation, and can withstand the harsh environments often encountered in industrial applications.

While color coding of materials, surface area coverage, and installation costs may be important considerations in specific contexts, they do not directly reflect the fundamental attributes that ensure the quality and performance of materials in terms of their physical characteristics.