The volatiles were further analyzed to determine the chemical compositions by using gas chromatography as described above. The chemical compositions of volatiles for a few model compounds are illustrated in the chromatograms below in Figure . Heat generated by fire, as reported earlier, depends to a great extent on the chemical composition of the volatiles because different chemical compounds generate different combustion energies. Furthermore, the composition of volatiles plays a significant role in the toxic effects of fire on human health. Fardell et al reported earlier techniques that are used to measure the chemical composition of fire effluents and thereby their toxicity. Therefore, we identified the chemical structure and composition of volatiles by comparing the chromatogram with mass numbers of different compounds from the NIST library. The identification of chemical compounds revealed that the formulations that burned and did not pass V0 contained very high amounts of low molecular weight aliphatic and aromatic hydrocarbons, among other compounds that we have not reported here, compared to the formulations that passed V0. The chemical composition of volatiles and the UL-94V classifications showed a good correlation. Since we used this technique to chemically characterize the specific PFR additives as well, we found that we were able to observe specific marker peaks arising from specific PFR in cases where the formulation passed V0 classification compared to the formulations that did not pass V0 classification.