Grade designations for rosin.

CFR · 2024-01-01 · US · Title 7

The grades of rosin shall be designated, from highest to lowest, by the following letters, respectively: XC, XB, XA, X, WW, WG, N, M, K, I, H, G, F, E, D, B. In addition, the letters OP shall be used to designate the grade of opaque rosin, and the letters FF shall be used to designate the grade of normal wood rosin:

official document · source cfr-2024 · id 7:§ 160.13