ASTM E291-18

Standard Test Methods for Chemical Analysis of Caustic Soda and Caustic Potash (Sodium Hydroxide and Potassium Hydroxide)

1.1 ,These test methods cover only the analyses usually required on the following commercial products:

1.1.1 ,Caustic soda (sodium hydroxide), 50 and 73 ,% liquors, anhydrous (solid, flake, ground, or powdered), and