Durable and resistant to grease and moisture, which makes them great for heavy foods—hot and cold. 3rd-party tested to meet ASTM D 6868 standards and compostable within 180 days in commercial facilities only. Not suitable for backyard composting. They are microwave safe and have a heat tolerance of 212° F. Dinnerware Type: Plate; Material(s): Paperboard; Shape: Round; Diameter: 9".