How to Identify the Quality of Anhydrous Magnesium Chloride Powder

Anhydrous magnesium chloride powder enjoys relatively high utilization among anhydrous magnesium chloride products. Based on physical forms, anhydrous magnesium chloride is categorized into powder, flakes, large and small lumps, etc. So how can we distinguish its quality?

1. Visual Inspection

High-purity anhydrous magnesium chloride powder: off-white similar to flour and fine-textured.

Low-quality anhydrous magnesium chloride powder: grayish brown, containing iron, heavy metal impurities and recycled waste raw materials; dull and opaque white appearance indicates adulteration with sodium chloride, talcum powder or lime.

2. Tactile Feel

High-quality powder feels extremely fine with no gritty texture when rubbed. A handful pinched lightly loosens up instantly without hard lumps, with a slight damp tackiness.

3. Odor

High-purity anhydrous magnesium chloride powder has barely any pungent odor.

4. Simple Water Dissolution Test

Dissolve the sample in water. Premium products dissolve completely with almost no white precipitate. More white insoluble sediment in the solution means higher salt impurity content and inferior quality.

5. Heating Test

Place a small amount of sample in a test tube and heat it. If no condensed water droplets form on the inner tube wall, the product is free of crystal water and qualified anhydrous magnesium chloride. The appearance of water droplets proves adulteration with hydrous magnesium chloride and insufficient purity.

6. Weight Comparison Method

The molecular weight of anhydrous magnesium chloride is 95.21, much lower than 203.3 of magnesium chloride hexahydrate. Under the same mass, high-purity anhydrous magnesium chloride contains a higher proportion of active ingredients. Accurate weight comparison can preliminarily judge whether hydrous products are mixed in.

7. Third-Party Test Report

Request third-party quality inspection certificates and the manufacturer’s internal quality report of anhydrous magnesium chloride. Cross-checking these two documents is the most straightforward way to judge product quality. Intuitive COA parameters include magnesium chloride content, heavy metal levels (lead, arsenic), sodium ion content, sulfate content and other indicators.

Common Major Problems Found from Communication with New Customers

1.     Insufficient main content and excessive moisture

Standard purchased purity grades are 98%, 99% and 99.5%. This issue mainly arises from incomplete drying during production or poorly sealed packaging. As a professional manufacturer, Yuze adopts brand-new PE packaging with heat-sealed inner polyethylene bags for full tightness.

2.     Excessive impurities and substandard quality

Typical manifestations include excessive sulfate and heavy metals, uneven particle size from inadequate screening, and gritty texture. The powder dissolves unevenly with residual sediment at the bottom, increasing mixing difficulty. Such defects lead to poor whiteness and a higher tendency to agglomerate in storage.

Conclusion

With 13 years of experience anhydrous magnesium chloride manufacturer at Yuze, we have found that high-quality anhydrous magnesium chloride powder and other forms feature COA parameters close to those of food-grade specifications. Product quality is always positively correlated with its price.