Can you microwave glass? In a time where leftovers are prevalent and convenience is king, knowing a little bit of microwave safety is key. Not all glass is designed to be used in the microwave, so stick to products labeled "microwave safe." If the glassware isn't labeled, check by microwaving the container on high for a minute or two and give it a quick feel. If the container is hot, it's not safe to use for cooking in the microwave. A slightly warm or cool glass is microwave safe. That’s the high-level summary, but you’ll need to know a few more things before you can clearly identify if a specific glass container is microwave safe. See the details on PurelyFamily for more clarity.1