What are the thermal degradation thresholds for granite outdoor trash cans in wildfires?

Granite outdoor trash cans are often chosen for their durability and aesthetic appeal in public spaces, but their performance under extreme heat, such as during wildfires, is a critical consideration. Granite, a common igneous rock, primarily composed of minerals like feldspar, quartz, and mica, has a melting point that typically ranges from 1215°C to 1260°C (2220°F to 2300°F). However, thermal degradation begins at lower temperatures. In wildfires, surface temperatures can exceed 800°C (1472°F), which may not melt granite but can cause significant damage. At around 600°C (1112°F), granite may experience thermal shock, leading to cracking and spalling due to differential expansion of its mineral components. Prolonged exposure to temperatures above 300°C (572°F) can weaken the structural integrity, making the trash cans more susceptible to breakage. Factors such as the granite's specific mineral composition, moisture content, and the duration of heat exposure influence these thresholds. While granite trash cans offer some resistance compared to plastic or metal alternatives, they are not fireproof and can degrade in intense wildfires, potentially compromising their functionality and safety. For urban planning in wildfire-prone areas, it is essential to consider these thermal limits and possibly integrate additional fire-resistant measures or alternative materials to ensure public safety and infrastructure resilience.