40 CFR Part 63, Table 4 — Default Organic HAP Mass Fraction for Solvents and Solvent Blends
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
You may use the mass fraction values in the following table for solvent blends for which you do not have test data or manufacturer's formulation data.
| Solvent/solvent blend | CAS. No. | AverageorganicHAP massfraction | Typical organic HAP, percent by mass |
|---|---|---|---|
| 1. Toluene | 108-88-3 | 1 | Toluene. |
| 2. Xylene(s) | 1330-20-7 | 1 | Xylenes, ethylbenzene. |
| 3. Hexane | 110-54-3 | 0.5 | n-hexane. |
| 4. n-Hexane | 110-54-3 | 1 | n-hexane. |
| 5. Ethylbenzene | 100-41-4 | 1 | Ethylbenzene. |
| 6. Aliphatic 140 | | 0 | None. | |
| 7. Aromatic 100 | | 0.02 | 1% xylene, 1% cumene. | |
| 8. Aromatic 150 | | 0.09 | Naphthalene. | |
| 9. Aromatic naphta | 64742-95-6 | 0.02 | 1% xylene, 1% cumene. |
| 10. Aromatic solvent | 64742-94-5 | 0.1 | Naphthalene. |
| 11. Exempt mineral spirits | 8032-32-4 | 0 | None. |
| 12. Ligroines (VM & P) | 8032-32-4 | 0 | None. |
| 13. Lactol spirits | 64742-89-6 | 0.15 | Toluene. |
| 14. Low aromatic white spirit | 64742-82-1 | 0 | None. |
| 15. Mineral spirits | 64742-88-7 | 0.01 | Xylenes. |
| 16. Hydrotreated naphtha | 64742-48-9 | 0 | None. |
| 17. Hydrotreated light distillate | 64742-47-8 | 0.001 | Toluene. |
| 18. Stoddard solvent | 8052-41-3 | 0.01 | Xylenes. |
| 19. Super high-flash naphtha | 64742-95-6 | 0.05 | Xylenes. |
| 20. Varsol ® solvent | 8052-49-3 | 0.01 | 0.5% xylenes, 0.5% ethylbenzene. |
| 21. VM & P naphtha | 64742-89-8 | 0.06 | 3% toluene, 3% xylene. |
| 22. Petroleum distillate mixture | 68477-31-6 | 0.08 | 4% naphthalene, 4% biphenyl. |