Hydration cracks of magnesia-spinel bricks in cement industry have been serious problems for both refractory producers and refractory users for a long time. When magnesia-spinel bricks are kept for more than 6 months, the bricks tend to have reaction with water or moisture and result in cracks and loss on their structural strength. Those bricks cannot be used anymore and cause substantial loss for the related parties. In 2013, the Siam Refractory Industry Co., Ltd., Thailand, successfully developed and applied a special nanoª²technology to create “Anti-Hydration Magnesia-Spinel Bricks” for cement industry which can have the storage time more than two years even in high humidity areas. The cement producers can ensure that all bricks still have good properties as the new ones.