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Unformatted text preview: FLAMMABILITY OF CHEMICAL SUBSTANCES This table gives properties related to the flammability of about 900 chemical substances . The properties listed are: t B : Normal boiling point in C (at 101 .325 kPa pres- sure) . FP: Flash point, which is the minimum temperature at which the vapor pressure of a liquid is sufficient to form an ignitable mixture with air near the surface of the liquid . Flash point is not an intrinsic physi- cal property but depends on the conditions of mea- surement (see Reference 1) . Fl . Limits: Flammable limits (often called explosive limits), which specify the range of concentration of the va- por in air (in percent by volume) for which a flame can propagate . Below the lower flammable limit, the gas mixture is too lean to burn; above the up- per flammable limit, the mixture is too rich . Values refer to ambient temperature and pressure and are dependent on the precise test conditions . A ? indi- cates that one of the limits is not known . IT: Ignition temperature (sometimes called autoigni- tion temperature), which is the minimum tempera- ture required for self-sustained combustion in the absence of an external ignition source . As in the case of flash point, the value depends on specified test conditions . Even in cases where very careful measurements of flash point have been replicated in several laboratories, observed values can differ by 3 to 6C (Reference 4) . For more typical measurements, larger uncertainties should be assumed in both flash points and autoignition temperatures . The absence of a flash point entry in this table does not mean that the substance is nonflammable, but only that no reliable value is available . Compounds are listed by molecular formula following the Hill convention . Substances not containing carbon are listed first, fol- lowed by those that contain carbon . To locate an organic com- pound by name or CAS Registry Number when the molecular for- mula is not known, use the table Physical Constants of Organic Compounds in Section 3 and its indexes to determine the mo- lecular formula . References 1 . Fire Protection Guide to Hazardous Materials, 11th Edition , National Fire Protection Association, Quincy, MA, 1994 . 2 . Urben, P . G ., Ed ., Brethericks Handbook of Reactive Chemical Hazards, 5th Edition , Butterworth-Heinemann, Oxford, 1995 . 3 . Daubert, T . E ., Danner, R . P ., Sibul, H . M ., and Stebbins, C . C ., Physical and Thermodynamic Properties of Pure Compounds: Data Compilation , extant 1994 (core with 4 supplements), Taylor & Francis, Bristol, PA . 4 . Report of Investigation: Flash Point Reference Materials , National Institute of Standards and Technology, Standard Reference Materials Program, Gaithersburg, MD, 1995 ....
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This note was uploaded on 12/31/2011 for the course CHEMISTRY 101 taught by Professor Dr.dason during the Fall '08 term at Davenport.
- Fall '08
- The Land