Publisher Summary This chapter presents results for lower and upper explosive limits in air for major organic chemical compounds. The results are displayed in an easy-to-use table which is especially applicable for rapid engineering usage. The organic chemicals encompass hydrocarbon, oxygen, nitrogen, halogen, silicon, sulfur and other chemical type compounds. The tabulation also provides the freezing and boiling point temperatures, which are helpful in determining whether the substance is a gas, liquid, or solid at ambient conditions. It is based on both experimental data and estimated values. A comparison of estimates and data is shown for normal alkanes. The graph discloses favorable agreement. In the data collection, a literature search was conducted to identify data source publications. The publications were screened, and copies of appropriate data were made. These data were then keyed into the computer to provide a data base for which experimental data are available. The data base also serves as a basis to check the accuracy of the estimation methods.