Schedule 40 PVC, often abbreviated SCH 40, is a designation for PVC pipe and fittings that have met and conform to ASTM requirements. ASTM is one of the world's largest, not-for-profit voluntary standards developing organizations in the world; meeting the standards set forth ensure a quality product for customers. At Drainage Connect, all of our pipe is ASTM 1785D certified and all of our fittings are ASTM 2665 certified. Schedule 40 PVC has a max operating temperature of 140 degrees Fahrenheit (60 degrees Celsius). For temperatures above 73 degrees Fahrenheit, the pressure is derated. To learn more about Schedule 40 materials, please view our resource pages.