Magnesium is a highly reactive reducing element, which oxidation typically occurs with drastic liberation of energy. It is flammable in air. Hazardous dust explosions triggered by accidental ignition may possibly occur. Dust explosion risk tends to be higher as the average particle size decreases, since lower and upper explosive limits are generally expected to become more widely spaced. Static charge build-up should be avoided to limit ignition risk. Water and atmospheric humidity readily reacts with powdered magnesium. Inert atmosphere is generally recommended while processing. Some organic solvents may react with metallic Mg, maybe rather vigorously, possibly to form complex metallo-organic compounds. Metallic Mg may also react with residual humidity from organic solvents, often rather hygroscopic, so that it can be used to dry some of those solvents. Some common process control agents (PCA) can be considered unsuitable for milling and or homogenising Mg containing powder mixtures or pastes, owing to possible undesirable reactions with the metallic Mg.

you may experience inflammability during the manufacturing process of Mg composites.