Butane

Butane Characteristics
Synonyms		n-Butane, Methylethylmethane
CAS No.		106-97-8
Chemical formula		C₄H₁₀
Vapour density		2.05 (air = 1)
Safe Work Australia ES	TWA	800 ppm
Safe Work Australia ES	STEL	^__
Flammable limits	LEL	1.4 % by volume
Flammable limits	UEL	9.3 % by volume
Equipment group		IIA
Temperature classification		T2
Chemical/physical properties		Butane is a colourless gas with a slight odour, reportedly not detectable by smell below 50,000 ppm. It is highly flammable.
Hazardous properties		It is not considered to be toxic but can cause drowsiness at concentrations of around 10,000 ppm.
Occurrence/Uses		Butane is a major constituent of LPG and is also found in natural gas.
Detectors available		Catalytic bead (0 – 100% LEL)
Detectors available		Gas detector tube (0.05 – 0.6% by volume)
Suggested alarm levels		Lo: 5 % LEL (700 ppm)
Suggested alarm levels		Hi: 10 % LEL (1,400 ppm)
Notes