| http://www.w3.org/ns/prov#value | - It lists methane, ethane, nitrogen and propane as the primary composition of the chemicals, and lists asphyxia as a potential health effect of inhaling the chemical, with symptoms including rapid breathing, headaches, dizziness, visual disturbances, weakness, tremors, unconsciousness and death ???depending on concentration and duration of exposure.??? In studies on dogs exposed to butane, the MSDS
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