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Minimum ignition charge

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The minimum ignition charge (MZQ) describes the ignition sensitivity of a medium, in the proper sense of a flammable substance such as a gas, liquid or solid, to discharges of static electricity.[1] It is mainly used to assess discharges originating from plastics.

In the “Technical Rules for Hazardous Substances – Avoidance of ignition hazards due to electrostatic charges[2]“(TRGS 727, Annex G), the following minimum ignition charges and minimum ignition energies are listed.

Minimum ignition charges
Link Minimum ignition energy
(mJ)
Minimum ignition charge
(nC)
Most ignitable
Mixture
(% by volume)
Explosion
group according to IEC 60079-0
Acetaldehyde 0,38 – – – – IIA
Acetone 0,55 127 6,5 IIA
Acrylonitrile 0,16 – – 9,0 IIB
Ammonia 14 1500 20 IIA
Benzene 0,20 45 4,7 IIA
1,3-butadiene 0,13 – – 5,2 IIB
Butane 0,25 60 4,7 IIA
2-butanone 0,27 – – 5,3 IIA
Cyclohexane 0,22 – – 3,8 IIA
Cyclopropane 0,17 – – 6,3 IIB
1,2-dichloroethane 1,0 – – 10,5 IIA
Dichloromethane 9 300 880 000 18 IIA
Diethyl ether 0,19 40 5,1 IIB
2,2-dimethylbutane 0,25 70 3,4 IIA
Ethyl acetate 0,46 120 5,2 IIA
Ethan 0,25 70 6,5 IIA
Ethanol 0,28 60 6,4 IIB
Ethene 0,082 32 8,0 IIB
Ethyne 0,019 – – 7,7 IIC
Ethylene oxide 0,061 – – 10,8 IIB
Heptane 0,24 60 3,4 IIA
Hexane 0,24 60 3,8 IIA
Methane 0,28 70 8,5 IIA
Methanol 0,20 50 14,7 IIA
2-methylbutane 0,21 63 3,8 IIA
Methylcyclohexane 0,27 70 3,5 IIA
Pentane 0,28 63 3,3 IIA
cis-2-pentene 0,18 – – 4,4 IIB
trans-2-pentene 0,18 – – 4,40 IIB
Propane 0,25 70,00 5,20 IIA
1-Propin 0,11 – – 6,50 IIB
Propylene Oxide 0,13 – – 7,50 IIB
Carbon disulfide 0,01 – – 7,80 IIC
Tetrafluoroethene 4,10 – – – – IIA
Tetrahydro-2H-pyran 0,22 60,00 4,70 IIA
1,1,1-Trichloroethane 4 800 700 000 12,00 IIA
Trichloroethene 510,00 150 000 26,00 IIA
Hydrogen 0,02 12,00 22,00 IIC

Individual references

  1. Ignition hazards due to electrostatic charges: Fundamentals of electrostatics ; information on the implementation of TRBS 2153 with wording. ecomed-Storck, 2009, ISBN 978-3-609-61870-8, p. 40(books.google.de).
  2. BAuA – TRGS 727 Avoidance of ignition hazards due to electrostatic charges / Technical rules for hazardous substances (TRGS) / Hazardous substances / Topics from A-Z / Federal Institute for Occupational Safety and Health. Retrieved 23 March 2017. ,07.2016