The activity is an important index to measure magnesium oxide used for rubber industry. As one of the important inorganic active agent, the active magnesium oxide can improve significantly degree of vulcanization in sizing material, even if the dosage is small.
The magnesium oxide and zinc oxide have mobility and antioxdative competence. It can increase the tensile strength and impact resistance of rubber. The magnesium oxide is an important accessory ingredient of rubber.
In the chloroprene rubber, the magnesium oxide and zinc oxide can be used as vulcanizing agent. It plays a certain function to reduce the vulcanization rate of zinc oxide. It can prevent early cross-linking. At the same time, the magnesium oxide takes the part of acid acceptor, and can prevent from scorch and cyclizing. Generally speaking, it is added in mixing preliminary stage. The activity(iodine sorption value) of magnesium oxide has a great influence to anti-G-CR scorch performance. In addition, it has a influence to tensile strength, tensility and hardness of CR. It is the same as in rubber. Although the magnesium oxide is not the most important material in rubber, it takes an important role in it.