Reactivity is an important purpose to balance the physical adsorption and chemical reactivity of lightly burned magnesia. Active magnesium oxide is a kind of magnesium oxide, mainly used as accelerator and activator in rubber industry. It improves adhesion strength, improves transparency, and prevents precipitation and delamination. Adhesive common magnesium oxide, FRP public magnesium oxide, wire and cable common magnesium oxide, medical glue common magnesium oxide, friction material utility magnesium oxide, tire public magnesium oxide, in adhesives and sealing materials, demand for different active magnesium oxide is to add, because the commodity is directly related to the activity of magnesia shake and the quality of the goods, Therefore, it is more and more important to study and determine the activity of magnesium oxide.

Magnesium oxide activity refers to the ability of magnesium oxide to participate in physical or chemical processes under specific experimental conditions. The difference is mainly due to the unsaturated valence bond on the surface of magnesium oxide. If there are many defects and lattice distortion on the surface structure of magnesium oxide, it indicates high activity. Otherwise, if the structure of MgO is compact and the lattice is incomplete, its activity is low. Therefore, the activity of magnesium oxide is only a relative concept.

There are many methods to determine the activity of magnesium oxide, such as thermal analysis, adsorption iodine value method, nitrogen adsorption method, BET method, water method, CT method, phase analysis method, citric acid method, dissolution activation energy method, specific volume method, bulk density method, etc. There are many factors that affect the activity of magnesium oxide, such as raw material type, reaction temperature, calcination conditions and so on. At the same time, these determination methods have their own application scope and limitations.

Therefore, it is still difficult to characterize the activity of magnesium oxide in general purposes. Only under opposite experimental conditions can we compare the relative magnitude of reactivity by the relative change of its particular response.