One of my favorite products to sublimate is ceramics. Mugs and tiles, and glass cutting boards, crystals, and slates all fall under this umbrella. Notice we put those in one category – they are easy and fast. But we need to understand that ceramic is a poor conductor of heat. We can sublimate in 30 seconds; however, with ceramic, glass, and slate, you will need more time. These items vary from 4 to 8 minutes.
When it comes to ceramic tiles, use this process: image face up on the press, tile face down for 400 F for 5 minutes. Yes, we can press more than one tile at a time (please note: keep sizes and the manufacturer the same); add 30 seconds to the time for each additional tile.
-Michael Kaminsky, Sublimation101