What should be used to mark refractory specimens after curing?

Using heat-resistant paint to mark refractory specimens after curing is essential due to the unique properties of refractory materials. Refractory specimens are designed to withstand extremely high temperatures, often exceeding those experienced in typical industrial environments. Regular paint does not have the thermal stability required for such applications and can degrade, peel, or emit harmful fumes when exposed to high heat.

Heat-resistant paint, on the other hand, maintains its integrity and stays intact under the high temperatures that refractory linings may encounter during service. It is specifically formulated to endure the thermal stresses and remain readable, ensuring that the specimens can be identified accurately throughout their testing processes.

While permanent markers and label stickers may seem convenient for marking, they can fail under high temperatures. Permanent markers can easily fade or burn off, while label stickers often lose adhesion and can char or melt, rendering them ineffective for long-term identification of the specimens. Thus, using heat-resistant paint is crucial for ensuring durability and longevity in marking refractory specimens.