Specific optical density
Specific optical density means the numeric value assigned to a material when tested in accordance with ASTM E 662 (incorporated by reference, see 114.600) by an independent laboratory.
46 CFR § 114.400
Terms used in this subchapter are defined in paragraph (b) of this section. The number in parenthesis after certain terms describing areas on a vessel refers to the applicable column and row number where that area is listed in Tables 116.415 (b) and (c) of part 116 of this subchapter.