When purchasing magnesium oxide, quality is a key factor to consider. Purity is one of the important indicators of magnesium oxide quality. According to national standards, the magnesium oxide content in industrial-grade magnesium oxide should not be less than 90%, while the magnesium oxide content in food-grade magnesium oxide should not be less than 96%. The higher the purity, the better the performance and applicability of the magnesium oxide.

For industrial-grade magnesium oxide, the standard requires a specific surface area of not less than 120 m²/g, whiteness of ≥95%, and no presence of active magnesium oxide. For food-grade magnesium oxide, the preservative content should comply with food safety standards.

Particle size distribution significantly affects the performance and application efficacy of magnesium oxide. Generally, finer particle size magnesium oxide products have better dispersibility and activity. Users should choose products with fine and uniformly distributed particles based on their application needs.

Heavy metal content is an important indicator of the environmental performance of magnesium oxide products. Excessive heavy metal content can not only cause environmental pollution but also pose adverse health effects. When purchasing, attention should be paid to the heavy metal content of the product, opting for products with low heavy metal content.

Choose magnesium oxide according to your product performance requirements. Different fields have different performance requirements for magnesium oxide, such as high temperature resistance, acid and alkali resistance, and electrical insulation. For example, magnesium oxide used in ceramics and coatings requires smaller particle size, while magnesium oxide used in flame retardants and high-temperature insulating materials requires larger particle size.

Select reputable manufacturers and check whether the product has relevant certifications, such as ISO9001 quality management system certification.

When purchasing magnesium oxide, comprehensively consider factors such as purity, physical properties, particle size distribution, heavy metal content, application requirements, manufacturer reputation, and certifications to ensure that you acquire high-quality magnesium oxide products.