Apart from being BPI Certified compostable, tests have shown that soil containing VerTerra compost enhances plant growth by over 15%. Aside from acting as a natural insulator, our dinnerware will not leak or impart taste. Can withstand up to 2 minutes in the microwave on a high heat setting or up to 45 minutes in the oven on 350° as long as they are at least 6" from the heat source. Naturally biodegrade at hoe or in an industrial compost without using chemical agents.