Corrosivity: D002. 1  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. 2  It is a liquid and corrodes steel (SAE 1020) at a rate greater than 6.35 mm(0.250 inch) per year at a test temperature of 55Â°C (130Â°F).
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