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Explosion and decomposition limits of flammable and chemically unstable gases were determined experimentally in a dosed autoclave with varying ignition energy up to 1000 J. The ignition source was a lightning arc caused by an exploding wire igniter as described in EN 1839 B .. In case of methane only the upper explosion limit was influenced significantly by the ignition energy, whereas the lower explosion limit was constant. In case of R32 however. it was the lower explosion limit that was influenced significantly by the ignition energy and not the upper explosion limit. A particularly strong dependency from the ignition energy was found for the decomposition limits of the chemically unstable gases in nitrogen.