PHYSICAL PROPERTIES

5.139

5.7COMBUSTIBLE MIXTURES

TABLE 5.23 Properties of Combustible Mixtures in Air
The autoignition temperature	is the minimum temperature required for self-sustained combustion in the absence
of an external ignition source. The value depends on specified test conditions. The				flammable (explosive) limits
specify the range of concentration of the vapor 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 flammable limit, the mixture is
too rich. Additional compounds can be found in National Fire Protection Association, National Fire Protection
Handbook, 14th ed., 1991.
For alternative nomenclature, see Table 1.15.
					Flammable (explosive)
					limits, percent by
					volume of fuel (25		C,
						760 mm)
		Autoignition
Substance		temperature,	C		Lower	Upper
Acetaldehyde		175		4.0		60
Acetanilide		540
Acetic acid, glacial		463		4.0		19.9
Acetic anhydride		316		2.7		10.3
Acetone		465		2.5		12.8
Acetonitrile		524		3.0		16.0
Acetophenone		570
Acetylacetone		340
Acetylene		305		3.0		65
Acetyl chloride		390
Acrolein		220		2.8		31.0
Acrylic acid (2-propenoic acid)	438		2.4			8.0
Acrylonitrile		481		3.0		17.0
Adiponitrile		550		2		5
Allyl acetate		374
Allyl alcohol		378		2.5		18.0
Allylamine		374		2.2		22
Ammonia, anhydrous		651		16		25
Aniline		615		1.3		11
Asphalt		485
Benzaldehyde		192
Benzene		498		1.2		7.8
Benzoyl peroxide		80
Benzyl acetate		460
Benzyl alcohol		436
Benzyl benzoate		480
Benzyl chloride		585		1.1
Bis(2-aminoethyl)amine		399
Bis(2-chloroethyl) ether		369		2.7
Biscyclohexyl		245		0.7		5.1
Bis(2-hydroethyl) ether		229
Bromobenzene		565
1-Bromobutane		265		2.6		6.6
Bromoethane		511		6.8		8.0
Bromomethane		537		10		16.0
1-Bromopropane		490

5.140		SECTION 5
TABLE 5.23 Properties of Combustible Mixtures in Air (		Continued	)
						Flammable (explosive)
						limits, percent by
						volume of fuel (25		C,
							760 mm)
		Autoignition
	Substance	temperature,		C		Lower	Upper
3-Bromopropene		295			4.4		7.3
1,3-Butadiene		420			2.0		11.5
Butanal (butyraldehyde)		218			1.9		12.5
Butane		287			1.9		8.5
1,3-Butanediol		395
2,3-Butanediol		402
Butanenitrile		501			1.65
Butanoic acid (butyric acid)		443			2.0		10.0
Butanoic anhydride (butyric anhydride)		279		0.9	5.8
1-Butanol		343			1.4		11.2
2-Butanol		415			1.7		11
2-Butanone		404			1.4		11.4
trans	-2-Butenal (crotonaldehyde)	232			2.1		15.9
1-Butene		384			1.6		9.3
cis -2-Butene		324			1.7
trans -2-Butene		324			1.8		9.7
1-Butene oxide					1.5		18.3
3-Buten-1-ol					4.7		34
2-Butoxyethanol		238			4		13
2-(2-Butoxyethoxy)ethyl acetate		299
Butyl acetate		425			1.7		7.6
sec	-Butyl acetate				1.7		9.8
Butylamine		312			1.7		9.8
tert	-Butylamine	380			1.7		8.9
Butylbenzene		410			0.8		5.8
sec	-Butylbenzene	418			0.8		6.9
tert	-Butylbenzene	450			0.7		5.7
Butyl formate		322			1.7		8.2
Butyl methyl ketone		423			1		8
Butyl 2-methyl-2-propenoate		294			2		8
Butyl propanoate		427
Butyl stearate		355
Butyl vinyl ether		255
2-Butyne					1.4
Camphor		466			0.6		3.5
Carbon disulfide		90			1.3		50.0
Carbon monoxide		609			12.5		74.2
Carbonyl sulfide					12		28.5
Chlorobenzene		593			1.3		9.6
1-Chloro-1,3-butadiene					4.0		20.0
1-Chlorobutane		240			1.8		10.1
2-Chloro-2-butene					2.3		9.3
1-Chloro-2,3-epoxypropane		411			4		21
1-Chloro-1,1-difluoroethane					6.2		17.9
1-Chloro-2,4-dinitrobenzene					2.0		22
1-Chloro-2,3-epoxypropane		411			3.8		21
Chloroethane		519			3.8		15.4
2-Chloroethanol		425			4.9		15.9
Chloromethane		632			8.1		17.4
1-Chloro-3-methylbutane					1.5		7.4
1-Chloro-2-methylpropane					2.0		8.8

	PHYSICAL	PROPERTIES					5.141
TABLE 5.23	Properties of Combustible Mixtures in Air (	Continued	)
						Flammable (explosive)
						limits, percent by
						volume of fuel (25 C,
							760 mm)
		Autoignition
	Substance	temperature,		C		Lower	Upper
3-Chloro-2-methyl-1-propene					2.3		9.3
1-Chloronaphthalene		588
1-Chloropentane		260			1.6		8.6
1-Chloropropane		520			2.6		11.1
2-Chloropropane		593			2.8		10.7
1-Chloro-1-propene					4.5		16
2-Chloro-1-propene					4.5		16
3-Chloro-1-propene		485			2.9		11.1
Chlorotrifluoroethylene					24		40.3
m -Cresol		558			1.1
o -Cresol		599			1.4
p -Cresol		558			1.1
Cumene		424			0.9		6.5
Cyanogen					6.6		32
Cyclobutane					1.8
Cyclohexane		245			1.3		8
Cyclohexanol		300			1		9
Cyclohexanone		420			1.1		9.4
Cyclohexene		244			1.2
Cyclohexyl acetate		334
Cyclohexylamine		293			1		9
Cyclopentane		361			1.5
Cyclopentene		395
Cyclopropane		500			2.4		10.4
p -Cymene		436			0.7		5.6
trans -Decahydronaphthalene		255			0.7		5.4
Decane		210			0.8		5.4
Decene		235
Diborane(6)		38 to 52			0.8		88
Dibutylamine					1.1		6
Dibutyl decanedioate (dibutyl sebacate)		365		0.44
Dibutyl ether		194			1.5		7.6
Dibutyl o -phthalate		402			0.5
1,2-Dichlorobenzene		648			2.2		9.2
1,1-Dichloroethane		458			5.4		11.4
1,2-Dichloroethane		413			6.2		16
1,1-Dichloroethylene		570			6.5		15.5
cis -1,2-Dichloroethylene		460			3		15
trans -1,2-Dichloroethylene		460			6		13
Dichloromethane		556			13		23
1,2-Dichloropropane		557			3.4		14.5
Diethanolamine [2,2	-iminobis(ethanol)]	662			2		13
1,1-Diethoxyethane (acetal)		230			1.6		10.4
Diethylamine		312			1.8		10.1
Diethylene glycol [bis(2-hydroxyethyl) ether]		224			2		17
Diethylene glycol dibutyl ether		310
Diethylene glycol monoethyl ether acetate		425
Diethylene glycol monomethyl ether		240		1.4			22.7
Diethylenetriamine		358			2		6.7
Diethyl ether		180			1.9		36.0
3,3-Diethylpentane		290			0.7		5.7

5.142		SECTION 5
TABLE 5.23 Properties of Combustible Mixtures in Air (		Continued	)
						Flammable (explosive)
						limits, percent by
						volume of fuel (25		C,
							760 mm)
		Autoignition
	Substance	temperature,		C		Lower	Upper
Diethyl peroxide					2.3		15.9
Diethyl sulfate		436
1,1-Difluoroethylene					5.5		21.3
1,3-Dihydroxybenzene (resorcinol)		664
1,4-Dihydroxybenzene		516
Diisopropylamine		316			1.1		7.1
Diisopropyl ether		443			1.4		7.9
Dimethoxymethane		237			2.2		13.8
N,N	-Dimethylacetamide	490			2.0		11.5
Dimethylamine (anhydrous)		400			2.8		14.4
N,N	-Dimethylaniline	371
2,3-Dimethylaniline					1.0
2,2-Dimethylbutane		405			1.2		7.0
2,3-Dimethylbutane		405			1.2		7.0
3,3-Dimethyl-2-butanone		423			1		8
cis -1,2-Dimethylcyclohexane		304
trans -1,2-Dimethylcyclohexane		304
Dimethyl ether		350			3.4		27.0
N,N	-Dimethylformamide	445			2.2		15.2
2,6-Dimethyl-4-heptanol					0.8		6.1
2,6-Dimethyl-4-heptanone		396			0.8		6.2
2,3-Dimethylhexane		438
1,1-Dimethylhydrazine		249			2		95
2,3-Dimethylpentane		335			1.1		6.7
Dimethyl 1,2-phthalate		490			0.9
2,2-Dimethylpropane		450			1.4		7.5
Dimethyl sulfate		188
Dimethyl sulfide		206			2.2		19.7
Dimethyl sulfoxide		215			2.6		42
1,4-Dioxane		180			2.0		22
Dipentene		237
Dipentyl ether		170
Diphenylamine		634
Diphenyl ether		618			0.8		1.5
Dipropylamine		299
Dipropyl ether		188			1.3		7.0
Divinyl ether		360			1.7		27.0
Dodecane		203			0.6
1-Dodecanol		275
1,2-Epoxybutane		439			1.7		19
Ethane		515			3.0		12.5
1,2-Ethanediamine		385			2.5		12.0
1,2-Ethanediol		398			3.2		22
Ethanethiol		299			2.8		18.2
Ethanol		363			3.3		19
Ethanolamine		410			3.0		23.5
2-Ethoxyethanol		235			3		18
2-Ethoxyethyl acetate		379			2		8
1-Ethoxypropane					1.7		9.0
Ethyl acetate		426			2		11.5
Ethyl acetoacetate		295			1.4		9.5

PHYSICAL	PROPERTIES					5.143
TABLE 5.23 Properties of Combustible Mixtures in Air (	Continued	)
					Flammable (explosive)
					limits, percent by
					volume of fuel (25		C,
						760 mm)
	Autoignition
Substance	temperature,		C		Lower	Upper
Ethyl acrylate	372			1.4		14
Ethylamine	385			3.5		14.0
Ethylbenzene	432			0.8		6.7
Ethyl benzoate	490
Ethyl butanoate	463
2-Ethylbutanoic acid	463
Ethyl chloroformate	500
Ethylcyclobutane	210			1.2		7.7
Ethylcyclohexane	238			0.9		6.6
Ethylene	490			2.7		36.0
Ethylene glycol diacetate	482			1.6		8.4
Ethylene glycol dimethyl ether	202
Ethylene glycol ethyl ether acetate	379		2			8
Ethylene glycol monobutyl ether	238		4			13
Ethylene glycol methyl ether acetate	392		2			12
Ethylene glycol monoethyl ether	235		3			18
Ethyleneimine	320			3.3		54.8
Ethylene oxide	429			3.0		100
Ethyl formate	455			2.8		16.0
2-Ethylhexanal	197
2-Ethyl-1,3-hexanediol	360
2-Ethyl-1-hexanol	231			0.88		9.7
2-Ethylhexyl acetate	268			0.76		8.14
Ethyl lactate	400			1.5
Ethyl methyl ether				2.0		10.0
3-Ethyl-2-methylpentane	460
Ethyl nitrate	85 explodes			3.8
Ethyl nitrite	90 explodes			3.0		50.0
Ethyl propanoate	440			1.9		11
Ethyl vinyl ether	202			1.7		28
Formaldehyde	430			7.0		73.0
Formic acid, 90%	434			18		57
2-Furaldehyde (furfural)	316			2.1		19.3
Furan				2.3		14.3
Furfuryl alcohol	491			1.8		16.3
Gasoline, 50-100 octane	280 to 456			1.4		7.6
Glycerol	370			3		19
Heptane	204			1.05		6.7
2-Heptanone (methyl pentyl ketone)	393		1.1			7.9
4-Heptanone (diisobutyl ketone)	396		0.8			7.1
1-Heptene	260
1,1,2,3,4,4-Hexachlorobutadiene	610
Hexane	225			1.1		7.5
1,6-Hexanedioic acid	420
Hexanoic acid	380
2-Hexanone	423			1		8
1-Hexene	253
Hydrazine	23 to 270			4.7		100
Hydrogen	400			4.1		74.2
Hydrogen cyanide, 96%	538			5.6		40.0
Hydrogen sulfide	260			4		46

5.144		SECTION 5
TABLE 5.23 Properties of	Combustible Mixtures in Air (	Continued	)
						Flammable (explosive)
						limits, percent by
						volume of fuel (25		C,
							760 mm)
		Autoignition
Substance		temperature,		C		Lower	Upper
N -Hydroxyethyl-1,2-ethanediamine		368
1-Hydroxy-2-methylbenzene		599			1.4
1-Hydroxy-3-methylbenzene		559			1.1
1-Hydroxy-4-methylbenzene (see	p -cresol)
4-Hydroxy-4-methyl-2-pentanone		643			1.8		6.9
Isobutanal		196			1.6		10.6
Isobutyl acetate		421			1		10.5
Isobutylamine		378			2		12
Isobutylbenzene		427			0.8		6.0
Isobutyl isobutyrate		432			0.96		7.59
Isopentane		420			1.4		7.6
Isopentyl acetate		360			1.0		7.5
Isoprene		220			2		9
Isopropyl acetate		460			1.8		8
Isopropyl alcohol		399			2.5		12.7
Isopropylamine		402			2.3		10.4
Isopropylbenzene (cumene)		424			0.8		6.5
Isopropyl formate		485
4-Isopropyl-1-methylbenzene		436
Kerosene		210			0.7		5.0
Maleic anhydride		477			1.4		7.1
Methacrylic acid		68			1.6		8.8
Methacrylonitrile					2		6.8
Methane		650			5.3		15.0
Methanethiol					3.9		21.8
Methanol		464			6.0		36
Methoxybenzene (anisole)		475
2-Methoxyethanol		285			1.8		14
2-Methoxyethyl acetate		392			1.5		12.3
Methyl acetate		454			3.1		16
Methyl acetoacetate		280
Methyl acetylacetate		280
Methyl acrylate		468			2.8		25
Methylamine		430			4.9		20.7
2-Methylbutane					1.4		7.6
2-Methyl-1-butanol		385			1.4		9.0
2-Methyl-2-butanol		437			1.2		9.0
3-Methyl-1-butanol		350			1.2		9.0
3-Methylbutyl acetate		360			1.0		7.5
2-Methyl-2-butene		275			1.6		8.7
3-Methyl-1-butene		365			1.5		9.1
2-Methyl-1-buten-3-one					1.8		9.0
Methyl chloroformate		504
Methylcyclohexane		250			1.2		6.7
cis -2-Methylcyclohexanol		296
trans -2-Methylcyclohexanol		296
cis -4-Methylcyclohexanol		295
trans -4-Methylcyclohexanol		295
Methylcyclopentane		258			1.0		8.35
Methyl formate		449			4.5		23
2-Methylhexane		280			1.0		6.0

		PHYSICAL PROPERTIES					5.145
TABLE 5.23 Properties of Combustible Mixtures in Air (		Continued	)
						Flammable (explosive)
						limits, percent by
						volume of fuel (25		C,
							760 mm)
		Autoignition
	Substance	temperature,		C		Lower	Upper
3-Methylhexane		280
5-Methyl-2-hexanone		191			1.0		8.2
Methylhydrazine		196			2.5		97.	2
Methyl isobutyl ketone (MIBK)		448			1		8
2-Methyllactonitrile		688
Methyl methacrylate					1.7		8.2
1-Methyl-4-(1-methylethenyl)-cyclohexene (dipentene)		237
1-Methylnaphthalene		529
2-Methylpentane		264			1.0		7.0
3-Methylpentane		278			1.2		7.0
2-Methyl-2,4-pentanediol		306			1		9
2-Methyl-1-pentanol		310			1.1		9.65
4-Methyl-2-pentanol					1.0		5.5
4-Methyl-2-pentanone		452			2		8.0
4-Methyl-3-penten-2-one		344			1.4		7.2
2-Methylpropanal		223			1.6		10.6
2-Methyl-1-propanamine		378			2		12
2-Methylpropane		460			1.8		8.4
2-Methylpropanenitrile		482
Methyl propanoate		469			2.5		13
2-Methylpropanoic acid		481			2.0		9.2
2-Methyl-1-propanol		415			1.7		10.6
2-Methyl-2-propanol (	t- butyl alcohol)	478			2.4		8.0
2-Methyl-1-propene		465			1.8		9.6
2-Methylpropyl acetate		421			1.3		10.5
2-Methylpropyl formate		320			1.7		8
2-Methylpyridine		538
N -Methyl-2-pyrrolidone		346			1		10
Methyl salicylate		454
-Methylstyrene		574			1.9		6.1
Methyl vinyl ether					2.6		39
Morpholine		290			1		11
Naphtha, coal tar		277
Naphthalene		526			0.9		5.9
Neoprene					4.0		20
Nicotine		244			0.75		4.0
Nitrobenzene		482			1.8		9
2-Nitrobiphenyl		179
Nitroethane		414			3.4		17
Nitroglycerine		270
Nitromethane		418			7.3		22
1-Nitropropane		421			2.2
2-Nitropropane		428			2.6		11
Nonane		205			0.8		2.9
Octadecanoic acid (stearic acid)		395
cis -9-Octadecenoic acid (oleic acid)		362
Octane		206			1.0		6.5
1-Octene		230
Paraldehyde		238			1.3
Pentaborane(9)					0.42
Pentanamine					2.2		22

5.146	SECTION 5
TABLE 5.23 Properties of Combustible Mixtures in Air (	Continued	)
					Flammable (explosive)
					limits, percent by
					volume of fuel (25 C,
						760 mm)
	Autoignition
Substance	temperature,		C		Lower	Upper
Pentane	260			1.5		7.8
1,5-Pentanediol	335
Pentanoic acid	400
1-Pentanol	300			1.2		10.0
2-Pentanol	343
3-Pentanol	435			1.2		9.0
2-Pentanone (methyl propyl ketone)	452			1.5		8.2
3-Pentanone (diethyl ketone)	450			1.6
1-Pentene	275			1.5		8.7
Pentyl acetate	360			1.1		7.5
Pentylamine				2.2		22
Petroleum ether (solvent naphtha)	288		1.1			5.9
Phenol	715			1.8		8.6
Phosphorus, red	260
Phosphorus, white	30
Phosphorus pentasulfide	142
o -Phthalic anhydride	570			1.7		10.4
Picric acid	300 (explodes)
-Pinene	275
-Pinene	275
Piperidine				1		10
1-Propanal	207			2.6		17
1-Propanamine (propylamine)	318		2.0			10.4
Propane	450			2.1		9.5
1,2-Propanediol	371			2.6		12.5
1,3-Propanediol	400
Propanenitrile	512			3.1		14
1,2,3-Propanetriol (glycerol)	370			3		19
1,2,3-Propanetriol triacetate (triacetin)	433		1.0
Propanoic acid	465			2.9		12.1
Propanoic anhydride	285			1.3		9.5
1-Propanol	412			2.2		13.7
2-Propanol	399			2.0		12.7
Propene	460			2.4		10.1
Propyl acetate	450			1.7		8
Propylbenzene	450			0.8		6.0
Propyl formate	455
Propyl nitrate	175			2		100
Propyne				1.7
Pyridine	482			1.8		12.4
Quinoline	480
Sodium	115 (dry air)
Styrene	490			0.9		6.8
Sulfur (di-) dichloride	233
1,1,2,2-Tetrabromoethane	335
Tetrabromoethylene	335
1,1,1,2-Tetrachloroethane				5		12

	PHYSICAL	PROPERTIES					5.147
TABLE 5.23	Properties of Combustible Mixtures in Air (	Continued	)
						Flammable (explosive)
						limits, percent by
						volume of fuel (25		C,
							760 mm)
		Autoignition
	Substance	temperature,		C		Lower	Upper
1,1,2,2-Tetrachloroethane					20		54
Tetrahydrofuran		321			2		11.8
Tetrahydrofurfuryl alcohol		282			1.5		9.7
1,2,3,4-Tetrahydronaphthalene		385			0.8		5.0
2,2,3,3-Tetramethylpentane		430			0.8		4.9
2,2-Thiodiethanol		298
Titanium, powder		250
Toluene		480			1.1		7.1
Toluene diisocyanate					0.9		9.5
o -Toluidine (also	p -)	482
Tributylamine					1		5
1,1,1-Trichloroethane		537			7.5		12.5
1,1,2-Trichloroethane		460			6		28
Trichloroethylene		420			8		10.5
(Trichloromethyl)benzene		211
Trichloromethylsilane		404			7.6		20
1,2,3-Trichloropropane					3.2		12.6
Trichlorosilane		104
1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)		680
Tri- o -cresyl phosphate		385
Triethanolamine					1		10
Triethylamine		249			1.2		8.0
Triethylene glycol		371			0.9		9.2
Triethyl phosphate		454
Trimethylamine		190			2.0		11.6
1,2,3-Trimethylbenzene (hemimellitene)		470		0.8			6.6
1,2,4-Trimethylbenzene (pseudocumene)		500		0.9			6.4
1,3,5-Trimethylbenzene		559			1		5
2,2,3-Trimethylbutane		412
1,1,3-Trimethyl-3-cyclohexen-5-one		462			0.8		3.8
3,5,5-Trimethylcyclohex-2-ene-1-one		460			0.8		3.8
2,2,3-Trimethylpentane		346
2,2,4-Trimethylpentane		418			1.1		6.0
2,3,3-Trimethylpentane		425
Trioxane		414			3.6		28.7
Tri- o -tolyl phosphate		385
Turpentine					0.8
Vinyl acetate		402			2.6		13.4
Vinyl bromide		530			9		15
Vinyl butanoate					1.4		8.8
Vinyl chloride		472			3.6		33.0
4-Vinyl-1-cyclohexene		269
Vinyl fluoride					2.6		21.7
Vinylidene		573			5.6		16.0
m -Xylene		527			1.1		7.0
o -Xylene		463			0.9		6.7
p -Xylene		528			1.1		7.0