You need to understand the needs of users. They may be people working in the agricultural or industrial fields, or they may be a purchasing staff who needs to choose the right magnesium sulfate product for their company. The following guide can help you make the best choice.

Agricultural Industry Magnesium Sulfate Selection Guide
1. Purity and Composition Requirements
Agricultural grade magnesium sulfate (such as magnesium sulfate heptahydrate. MgSO:7H0) usually requires a purity of ≥99%, but allows a small amount of harmless impurities (such as calcium and sodium salts). Heavy metal control: It must comply with agricultural fertilizer standards (such as Chinese standard NY/T 1112) to ensure that the content of heavy metals such as lead, arsenic, and cadmium is below the limit to avoid soil pollution.
2. Solubility and morphology
Select products with fine particles or powder for fast dissolution, which are easy to dissolve and apply through the irrigation system to improve absorption efficiency. Particle uniformity: If used for mechanized fertilization, magnesium sulfate with consistent particle size must be selected to avoid clogging the equipment.
3. Nutritional ratio
Confirm the magnesium (Mg) content (usually ≥9.6%) and sulfur (S) content (≥13%) in the product to meet the needs of crops (such as leafy vegetables and fruit trees require high magnesium). It can be used with other fertilizers (such as mixed with nitrogen, phosphorus and potassium compound fertilizers), and attention should be paid to compatibility.
4. Certification and standards
Choose products that have passed organic certification (such as those suitable for organic agriculture) or meet national standards.
5. Transportation and storage
Magnesium sulfate is easy to absorb moisture and agglomerate, so moisture-proof packaging (such as woven bags lined with plastic bags) should be selected and stored in a dry and ventilated place. Pay attention to rain and moisture during long-distance transportation to avoid affecting product quality.

Guide to selecting magnesium sulfate for agriculture and industry
1. Purity grade and specifications
Industrial grade: Purity must be ≥99.5%, suitable for chemical industry, sewage treatment and other fields.
2. Physical form and process adaptability
Powder: Suitable for coatings, printing and dyeing and other processes that require rapid dissolution
Granular: Specific particle size (such as 20-40 mesh) is required for fireproof materials (such as flame retardants).
Anhydrous magnesium sulfate: Some high-temperature processes (such as glass manufacturing) require anhydrous form (MgSO).
3. Impurities and special requirements
Avoid chlorine (CI) or iron (Fe) impurities to prevent corrosion of equipment or affect product color (such as papermaking, textiles).
In sewage treatment, attention should be paid to the flocculation effect of magnesium sulfate and batches with fewer impurities should be selected.
4. Supply chain stability
Industrial continuous production has high requirements for raw material stability, and suppliers with stable production capacity and small quality fluctuations should be selected.
5. Transportation and storage
Magnesium sulfate is easy to absorb moisture and agglomerate, so moisture-proof packaging (such as woven bags lined with plastic bags) should be selected and stored in a dry and ventilated place. Pay attention to rain and moisture during long-distance transportation to avoid affecting product quality.