This stain resistant pan has no fillers what so ever repelling high temperature induced orders and stains. Use it in the microwave, oven, or even in the freezer this pan will continue to hold its shape and perform. No Plastic Fillers - Ultra Heat Resistant More Cuisine Essential's Silicone Loaf Pan can be used in the microwave, oven, or even in the freezer. Its durable and flexible pure silicone design allows for multiple uses without the fear of filler contamination. Bulfyss Silicone Loaf Pan is the first and only heat resistant loaf pan made with pure silicone. Its high-grade design and cuisine compatibility ensure for extensive performance. It is lifetime guaranteed against breakage unlike plastic filled imitations. All of our products are developed, manufactured, and housed in an eco-friendly environment and approved by all national and international guidelines; FDA/LFGB/and SGS Certified.