You must only opt for silicone baking pans that are made from FDA-approved food grade silicone which should be clearly stated on the label. Some silicone muffin pans are made with plastic fillers, which can be harmful to your wellness. When you see splits when twisting the pan, it should contain plastic fillers. Each silicone ware must have its manufacturer restrictions in terms of oven temperature that is usually found on the product.