ʻOku ʻi he vahaʻa ʻo e ngaahi fakangatangata ʻo e acetylene ʻa e 2.5% mo e 80%, fakahaaʻi ʻe lava ke hoko ʻa e lolotonga ʻi he taimi ʻoku ʻi loto ai ʻa e tokanga ʻi he ʻea ʻi he ngaahi ngataʻanga ko ʻeni. Mavahe mei he matapa ko ʻeni, he ʻikai fakaiku ʻa e ignition ki ha fakaʻauha.
Fakaikiiki, acetylene concentrations ʻi he 80% pe siʻi hifo ai 2.5% he ʻikai iku ia ki ha fakaʻauha, Naʻa mo ha maʻuʻanga ignition.