| Rank | Hazardous Materials | Incidents |
|---|---|---|
| 1 | Paint or paint-related material | 2,784 |
| 2 | Flammable liquids, NOS | 1,092 |
| 3 | Paint-related material (including paint thinning, drying, removing or reducing compound) | 979 |
| 4 | Paint (including Paint, Lacquer, Enamel,Stain, Shellac Solutions, Varnish, Polish, Liquid Filler, and Liquid Lacquer Base) | 731 |
| 5 | Corrosive Liquids, NOS | 666 |
| 6 | Fire extinguishers (containing a compressed gas) | 601 |
| 7 | Isopropanol | 528 |
| 8 | Sodium hydroxide, solution | 517 |
| 9 | Resin solution, flammable | 497 |
| 10 | Corrosive Liquid, basic, inorganic | 448 |
| 11 | Printing Ink, flammable | 436 |
| 12 | Corrosive Liquid, acidic, inorganic | 381 |
| 13 | Hydrochloric acid, solution | 349 |
| 14 | Biological substance, Category B | 288 |
| 15 | Adhesives (containing a flammable liquid) | 264 |
| 16 | Potassium Hydroxide, solution | 251 |
| 17 | Gasoline | 244 |
| 18 | Methanol | 240 |
| 19 | Alcohols, NOS | 225 |
| 20 | Sulfuric Acid | 221 |
KEY: NOS = Not Otherwise Specified.
NOTES: Due to multiple commodities being involved in a single incident, the totals above may not correspond to the totals in other reports. Reporting requirements and the 5800.1 form were changed as of January 1, 2005. Reportable incidents now include all undeclared hazardous materials shipments and specification cargo tanks that receive damage to their lading retention systems while hauling hazardous materials.
SOURCE: U.S. Department of Transportation, Pipeline and Hazardous Materials Safety Administration, Hazardous Materials Information System, available at http://hazmat.dot.gov/pubs/inc/hmisframe.htm as of July 2008.