StacksVerified U.S. regulatory reference

40 CFR Part 63, Table 22

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
Tank colorPaint factors (Fp)Paint Condition
RoofShell | Good | Poor
WhiteWhite | 1 | 1.15
Aluminum (specular)White | 1.04 | 1.18
WhiteAluminum (specular) | 1.16 | 1.24
Aluminum (specular)Aluminum (specular) | 1.2 | 1.29
WhiteAluminum (diffuse) | 1.3 | 1.38
Aluminum (diffuse)Aluminum (diffuse) | 1.39 | 1.46
WhiteGray | 1.3 | 1.38
Light grayLight gray | 1.33 | 1.44
Medium grayMedium gray | 1.4 | 1.58