Food warming mats are generally safe for heat-resistant countertops like stainless steel, tile, or sealed wood, but caution is crucial for natural stone (granite, quartz, marble) as prolonged heat can cause damage, cracking, or discoloration, so using a trivet or heat-resistant pad underneath is best for natural stone, quartz, solid surface or delicate surfaces to avoid costly damage. Not only can the mat cause cracks, it is more than likel ...