Mj. Pegg et al., DUST EXPLOSIBILITY CHARACTERISTICS OF AZIDE-BASED GAS GENERANTS, Journal of loss prevention in the process industries, 10(2), 1997, pp. 101-111
Explosibility testing of sodium azide (NaN3), and two new iron oxide-b
ased gas generants, designated as GG1 and GG2, was conducted according
to standard procedures. All the dusts were explosible in the range 0-
2.0 kg m(-3); however, rates of pressure rise were sufficiently low to
place them in dust class St. 1. Both the explosion pressures and rate
s of pressure rise increased without showing a marked maxima for dust
loadings up to 2.0 kg m(-3). This behaviour is quite different from th
at observed with most combustible dusts which show maxima in the range
0.50-1.0 kg m(-3). The explosibility characteristics depended strongl
y upon ignition energy. The minimum explosible concentration (MEG) inc
reased, and the rate of pressure rise decreased, on reducing the ignit
ion energy from 5 kJ to 2.5 kJ. Both iron oxide-based gas generant for
mulations were less explosible as dusts than sodium azide alone. Based
on a number of different variables, the following ranking for dust ex
plosibility hazards is proposed: GG2 < GG1 < sodium azide Of the two f
ormulations, the one which had the higher amount of iron oxide was the
least hazardous. (C) 1997 Elsevier Science Ltd.