The Hydrogen Peroxide component of the mixture is an oxidizing agent. It may cause ignition, violent combustion or explosion when in contact with easily oxidizable substances. The vapor of the liquid is heavier than air. Yes, under normal temperatures and pressures.
Thermal decomposition releases flammable oxygen and heat.
Decomposition is accelerated by agitation, contact with rough surfaces, alkalis, finely divided metals. Liquid or vapor can be ignited by heat, sparks, open flame, or strong oxidizers. Exposure to over 75 ppm is immediately dangerous to life and health. Acute exposure may cause extreme irritation and inflammation of the respiratory tract, sore throat, labored breathing and delayed pulmonary edema. It also can cause depression of central nervous system.