B2 - Alkali, Corrosive, Organic. An organic alkali (hydrocarbon based), either liquid or solid, meeting the
definition of a Corrosive Material (Class 8) under DOT Title 49, Section 173.136, or EPA 40 CFR 370.2, or
OSHA 1910.1200, Appendix A that causes visible destruction or irreversible alterations in human skin tissue at
the site of contact, or a liquid that has a severe corrosion rate on steel or aluminum, in accordance with any one of
the following criteria:
(a) A material is considered to be destructive or to cause irreversible alteration in human skin tissue if, when
tested on the intact skin of an albino rabbit, the structure of the tissue at the site of contact is destroyed or changed
irreversibly after an exposure period of 4 hours or less; or
(b) A liquid is considered to have a severe corrosion rate if its corrosion rate exceeds 6.25 mm (0.246 inches)
per year on steel (SAE 1020) or aluminum (nonclad 7075-T6) at a test temperature of 55oC (131oF). An
acceptable test is described in NACE Standard TM-01-69; or
(c) It is aqueous and has a pH in aqueous solution greater than or equal to 12.5 as determined by the test method
specified in Title 40 CFR, Section 261.22.
B3 - Alkali, Low Risk. A liquid or solid product that exhibits alkali (caustic/basic) properties and does not meet
the definition of HCCs B1 or B2 but which through experience or through documentation on the MSDS or
product bulletin would cause severe skin or eye irritation, dermatitis, or allergic skin reaction. Any classification
of a material into this category is a process which relies heavily on the professional judgment of the evaluator
recognizing that individuals react differently to exposure to chemicals. Factors to consider are the pH, the
intended use of the product, the type of package, and the concentration of the active ingredient(s).
C1 - Acid, Corrosive, Inorganic. An acid (not hydrocarbon based), either liquid or solid, meeting the definition
of a Corrosive Material (UN Class 8) under DOT Title 49, Section 173.136, or EPA 40 CFR 370.2, or OSHA 29
CFR 1910.1200, Appendix A that causes visible destruction or irreversible alterations in human skin tissue at the
site of contact, or a liquid that has a severe corrosion rate on steel or aluminum, in accordance with any one of the
following criteria:
(a) A material is considered to be destructive or to cause irreversible alteration in human skin tissue if, when
tested on the intact skin of an albino rabbit, the structure of the tissue at the site of contact is destroyed or changed
irreversibly after an exposure period of 4 hours or less; or
(b) A liquid is considered to have a severe corrosion rate if its corrosion rate exceeds 6.25 mm (0.246 inches)
per year on steel (SAE 1020) or aluminum (nonclad 7075-T6) at a test temperature of 55oC (131oF). An
acceptable test is described in NACE standard TM-01-69; or
B-4
