Magnesium oxide powder can be classified into various grades based on its purity, particle size, and application areas. Here are some common grades of magnesium oxide powder:

1.Industrial Grade Magnesium Oxide: This is a generally available and relatively inexpensive grade of magnesium oxide, mainly used in industrial applications that do not require high purity.

2.High Purity Magnesium Oxide: This type of magnesium oxide has very high purity and is usually used in research or special industrial applications. Depending on its purity, high purity magnesium oxide can be further subdivided into grades such as N grade, AR grade, and LR grade.

3.Heavy Magnesium Oxide: This grade of magnesium oxide powder has larger particle sizes and is suitable for applications that do not require high purity.

4.Nano Magnesium Oxide Powder: This magnesium oxide powder has much smaller particle sizes, typically only a few dozen nanometers, which gives it very high reactivity and special properties.

5.Silicon Steel Grade Magnesium Oxide: This is an important raw material used in the manufacturing of silicon steel sheets. It features high chemical purity, good suspension performance, low hydration rate, and a certain degree of activity.

6.Food Grade and Pharmaceutical Grade Magnesium Oxide: These two grades of magnesium oxide are mainly used in the food and pharmaceutical industries, requiring very high purity and safety standards.

Additionally, there are some magnesium oxide powders for special purposes, such as light magnesium oxide and active magnesium oxide, each with its own unique properties and application areas.

When selecting magnesium oxide powder, it is important to consider its intended use, required purity, and particle size, as well as the storage conditions. Generally, magnesium oxide powder should be stored in a sealed container, protected from light, and kept at room temperature to extend its shelf life.