It is not safe to put a blue pearl heat pack in a toaster oven. Blue pearl heat packs are typically designed for microwave use, and they contain gel beads or other materials that may not be suitable for direct exposure to dry heat in a toaster oven.
Using a heat pack not designed for toaster ovens can lead to the pack bursting, leaking, or catching fire, posing a safety hazard. Additionally, the high temperatures in a toaster oven can damage the heat pack and render it ineffective or dangerous for future use.
If you need to heat a heat pack, always follow the manufacturer's instructions and use the recommended heating method, which is typically a microwave. If you're unsure about the appropriate use of a specific heat pack, refer to the product's packaging or contact the manufacturer for guidance. Safety should always be the top priority when using any heating or cooking appliances.