40 C.F.R. § 63.1662-63 app Table 4 to Subpart RRRR of Part 63
You May Use the Mass Fraction Values in the Following Fable for Solvent Blends for Which You Do Not Have Test Data or Manufacturer's Formulation Data:
| Solvent type | Average organic HAP mass fraction | Typical organic percent HAP, by mass |
| Aliphatic2 | 0.03 | 1% Xylene, 1% Toluene, and 1% Ethylbenzene. |
| Aromatic3 | 0.06 | 4% Xylene, 1% Toluene, and 1% Ethylbenzene. |
1 Use this table only if the solvent blend does not match any of the solvent blends in Table 3 to this subpart and you only know whether the blend is aliphatic or aromatic.
2 E.g., Mineral Spirits 135, Mineral Spirits 150 EC, Naphtha, Mixed Hydrocarbon, Aliphatic Hydrocarbon, Aliphatic Naphtha, Naphthol Spirits, Petroleum Spirits, Petroleum Oil, Petroleum Naphtha, Solvent Naphtha, Solvent Blend.
3 E.g., Medium-flash Naphtha, High-flash Naphtha, Aromatic Naphtha, Light Aromatic Naphtha, Light Aromatic Hydrocarbons, Aromatic Hydrocarbons, Light Aromatic Solvent.
40 C.F.R. 63.1662-63 app Table 4 to Subpart RRRR of Part 63