What does the abbreviation "ND" signify on a safety data sheet?

The abbreviation "ND" on a safety data sheet signifies "Not Determined." This term is commonly used in the context of chemical safety information to indicate that certain data regarding the substance—such as toxicity levels, environmental impact, or specific safety parameters—has not yet been determined through testing or research. This designation alerts personnel that the status of the chemical in that context is unknown, thereby highlighting a potential gap in available safety information that should be recognized when handling the substance.

In contrast, "Not Detected" specifically refers to instances where a substance has been tested and was found to be absent. "Non-Dangerous" is not a standard term typically found in safety data sheets. "No Data" implies that there is simply no information available for a certain parameter but does not convey the nuance that testing has not yet been conducted, which "Not Determined" does. Therefore, the use of "ND" in the context of a safety data sheet most appropriately aligns with the interpretation of "Not Determined."