Under Standard 34, which code group does R-123 belong to?

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Multiple Choice

Under Standard 34, which code group does R-123 belong to?

Explanation:
Code groups under Standard 34 use two attributes: toxicity and flammability. The letter part (A, B, C, D) indicates the level of toxicity, with higher letters pointing to greater toxicity, and the number part (1–4) shows flammability, where 1 means nonflammable and larger numbers indicate more flammable. R-123 is classified as B1, so its group reflects a higher toxicity designation but nonflammability. That combination matches its documented properties, placing it in the B1 category rather than any of the other groups that would imply a different balance of toxicity or flammability.

Code groups under Standard 34 use two attributes: toxicity and flammability. The letter part (A, B, C, D) indicates the level of toxicity, with higher letters pointing to greater toxicity, and the number part (1–4) shows flammability, where 1 means nonflammable and larger numbers indicate more flammable. R-123 is classified as B1, so its group reflects a higher toxicity designation but nonflammability. That combination matches its documented properties, placing it in the B1 category rather than any of the other groups that would imply a different balance of toxicity or flammability.

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