Glass and glass ceramic cookware is microwave safe as long as it doesn't have gold or silver rims. Glass cups may or may not be microwave safe. ... Avoid microwaving cold food-containers, such as butter tubs and whipped topping bowls. These can release chemicals into food when exposed to high heat.

Can Pyrex ovenware go in the microwave?

Avoid placing Pyrex under a broiler, inside a toaster oven, or directly over a flame, stovetop or grill. And never put an empty Pyrex dish in the microwave.

How do you know if a dish is microwave safe?

Check the bottom of the container for a symbol. Microwave safe is usually a microwave with some wavy lines on it. If they container has a #5 on it, it is made from polypropylene, PP, so it is generally considered microwave safe.