U

Unknown: Available information with respect to man is considered invalid.

Note: Calcium compounds (chemical quicklime, etc.) have a toxic rating of 1 in all local categories and U in the systemic category; sodium hydroxide has a rating of 3, 3, 2 in all local categories and U in the systemic category; sodium carbonate has a rating of 2, 2, 2 in all local categories and U in the systemic category.

Note: Calcium compounds (chemical quicklime, etc.) have a toxic rating of 1 in all local categories and U in the systemic category; sodium hydroxide has a rating of 3, 3, 2 in all local categories and U in the systemic category; sodium carbonate has a rating of 2, 2, 2 in all local categories and U in the systemic category.

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