Is magnesium hydroxide a strong base

No, magnesium hydroxide is a medium strong base.
The pH of a chemical substance is relative, which is determined by the ionization degree of its aqueous solution. The more active the metal is, the more ionized it is in water.
Then its pH is stronger. Because of its ionization degree in water, magnesium hydroxide can only belong to medium strong base (magnesium hydroxide has a very small solubility, and the solution is very alkaline, sometimes treated as a weak base). When heated to 623k (350 ℃), it is dehydrated and decomposed: Mg (oh) 2 → mgo+h2o, which is easily soluble in acid or ammonium salt solution.
It is used in the manufacture of magnesium salt, refining of granulated sugar, pharmaceutical industry, daily chemical industry, etc. At the same time, the water vapor released by it can also be used as a smoke suppressant. Magnesium hydroxide is an excellent flame retardant with triple functions of flame retardancy, smoke suppression and filling in the rubber and plastic industry.
Store in a cool and ventilated warehouse, and the temperature should not exceed 37 ° C. It should be stored separately from oxidants and edible chemicals, and should not be mixed. Keep the container sealed. Keep away from kindling and heat sources.
The warehouse must be equipped with lightning protection equipment, and the exhaust system should be equipped with a grounding device to conduct and remove static electricity. Explosion proof lighting and ventilation are adopted. It is forbidden to use equipment and tools that are easy to produce sparks. The storage area should be equipped with leakage emergency treatment equipment and appropriate storage materials.