Section 30.123 - Corrosivity(1) A waste exhibits the characteristic of corrosivity if a representative sample of the waste has either of the following properties: (a) It is aqueous and has a pH less than or equal to 2, or greater than or equal to 12.5, as determined by a pH meter using the method prescribed by 310 CMR 30.153(1).(b) It is a liquid and corrodes steel (Type SAE 1020) at a rate greater than 6.35 mm (approximately 0.250 inch) per year at a test temperature of 55ºC (approximately 130ºF) as determined by the test method prescribed by 310 CMR 30.153(2).(2) A waste that exhibits the characteristic of corrosivity has the EPA Hazardous Waste Number of D002.