Can be used in a wide range of temperatures from -40°F to +446°F (-60°C to +230°C), indestructible and reusable. Microwave, oven, refrigerator, freezer and dishwasher safe. Silicone Soap Molds are flexible silicone molds that provide a non-stick surface that allows soap products to pop right out with a simple push from the bottom, so they won't break like hard plastic materials.