TITLE:	ES&H Manual
DOCUMENT ID:	6152 Appendix R1 Flammability Limits

Table 1: Fire Hazard Properties of Flammable Liquids, Gases, and Volatile Solid NFPA Fire Protection Guide to Hazardous Materials, 13th Edition

Gas	Density at NTP (kg/m3)	Flammability Limits (percentage volume in air at NTP)
Hydrogen*	0.0824	4.0-75.0
Deuterium*	0.180	5.0-75.0
Methane	0.668	5.0-15.0
Acetylene*	1.174	2.5-100**
Ethane	1.26	3.0-12.5
Propane	1.87	2.1-9.5
Isobutane	2.49	1.8-8.4
Dimethyl Ether	1.95	3.4-27.0
* Not expected to be routinely used in detectors because of its large flammability range, included for reference only. ** Flammable limit is 82%, but can explode under pressure up to 100%.

Cylinders are generally specified as containing a given number of standard cubic feet (SCF). The inventory may be estimated by using the above densities of the gas phase with the conversion 0.028 m3/ft3.

ISSUING AUTHORITY	APPENDIX AUTHOR	APPROVAL DATE	EFFECTIVE DATE	EXPIRATION DATE	REV.
ESH&Q Division	Bert Manzlak	01/26/05	01/26/05	01/26/08	0

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