Magnesium Sulfate Anhydrous
- Appearance: White powder
- Chemical Formula: MgSO4
- CAS No.: 7487-88-9
- Magnesium Sulfate Anhydrous (MgSO4): > 98%
- Magnesium Oxide (MgO): > 32%
- Magnesium (Mg): > 19.2%
- Sulfur (S): > 25.5%
- Water Solubility: 100%
- Water-Insoluble Matter: < 0.1%
- Moisture: < 1.0%
- pH: 5.0-8.0 (1% solution)
Reference price range:USD 600 - 820
Magnesium Sulfate Anhydrous
Premium agricultural Magnesium Sulfate Anhydrous: maximum Mg/S nutrient density for professional fertilizer formulation
Ihumate Magnesium Sulfate Anhydrous (MgSO4, CAS 7487-88-9) is a high-purity, fully water-soluble agricultural magnesium-sulfur fertilizer raw material with MgSO4 > 98%, MgO > 32%, Mg > 19.2% and sulfur (S) > 25.5%. The white powder grade is designed for water-soluble fertilizers, compound fertilizers, granulated fertilizers, foliar products, fertigation products and liquid fertilizer production.
1. Maximum Mg and S density: with no crystal water, anhydrous magnesium sulfate supplies more MgO, Mg and S per unit weight for high-analysis and freight-efficient formulas.
2. Clear agronomic function: magnesium supports chlorophyll, photosynthesis and sugar transport, while sulfur supports amino acids, proteins, oils, flavor compounds and stress metabolism.
3. Built for fertilizer factories: it can be used in NPK, WSF, compound fertilizers, granules, humic acid, amino acid, seaweed and micronutrient systems as a reliable Mg/S nutrition module.
4. The Ihumate advantage: batch control covers assay, MgO, Mg, sulfur, insoluble matter, moisture, pH, appearance and dissolution performance, backed by COA, SDS, export documents, dependable supply, formulation support and OEM/ODM packaging.
Compatibility note: avoid direct concentrated mixing with phosphates, carbonates and strong alkaline materials. With calcium fertilizers or micronutrients, run a jar test and use A/B tanks where needed.
Magnesium Sulfate Anhydrous Specifications
| Technical Parameters | Detailed Specs | Testing Methods | Reference Standards |
|---|---|---|---|
| Appearance | White powder | Visual inspection | - |
| Chemical Formula | MgSO4 | - | - |
| CAS No. | 7487-88-9 | - | - |
| Magnesium Sulfate Anhydrous (MgSO4) | > 98% | EDTA titration | - |
| Magnesium Oxide (MgO) | > 32% | EDTA titration | - |
| Magnesium (Mg) | > 19.2% | EDTA titration | - |
| Sulfur (S) | > 25.5% | Calculated value | - |
| Water Solubility | 100% | Visual and gravimetric method | - |
| Water-Insoluble Matter | < 0.1% | Gravimetric method | - |
| Moisture | < 1.0% | Oven drying | - |
| pH | 5.0-8.0 (1% solution) | pH meter | - |
Agricultural Magnesium Sulfate Anhydrous - Product Introduction Video
- Premium agricultural Magnesium Sulfate Anhydrous white powder
- Solubility, particle size and OEM packaging presentation
COA, TDS, MSDS & HM Test Reports
Certificate of Analysis (COA)
Certificate of Analysis: Magnesium Sulfate Anhydrous
Technical Data Sheet (TDS)
TDS: Magnesium Sulfate Anhydrous
Safety Data Sheet (MSDS)
MSDS: Magnesium Sulfate Anhydrous
Heavy Metal Test Report
Heavy Metal Test Report: Magnesium Sulfate Anhydrous
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Need custom documents or specific test results?
Frequently Asked Questions
1
What is Magnesium Sulfate Anhydrous used for in agriculture?
It supplies high-density magnesium and sulfur for water-soluble fertilizers, compound fertilizers, granulated fertilizers, foliar products, fertigation products and liquid fertilizer manufacturing.
2
How should buyers choose anhydrous, monohydrate or heptahydrate?
Anhydrous magnesium sulfate has the highest active Mg/S density for high-analysis formulas and freight efficiency. Monohydrate balances nutrient density and processing. Heptahydrate is commonly selected for routine fast water-soluble magnesium supply.
3
Which crops often need magnesium?
Citrus, grapes, tomato, cucumber, pepper, potato, tea, coffee, oil crops and flowers often need Mg, especially in sandy soils, high-potassium programs or acidic leached soils.
4
Can it be used for foliar feeding?
Yes where local labels allow it. Use low concentrations, spray in the morning or evening, avoid heat and intense light, and test compatibility and crop safety first.
5
Do the packaging-image specifications apply?
No. Packaging images show Ihumate bag formats and OEM/ODM capability only. Final guaranteed analysis, net weight and regulatory text follow the contract, batch COA, SDS and destination-market requirements.
6
Are you a trading company or a manufacturer?
We are a professional manufacturing enterprise. Our modern factory is located in Huozhou, Linfen, Shanxi, China. With an annual capacity of 500,000 tons, we invite global partners to visit our facility.
7
How do you perform quality control?
8
Do you provide samples?
9
What are the payment terms?
10
How can I track my shipment after payment?
11
What is the Minimum Order Quantity (MOQ)?
12
Can you customize packaging or print our logo?
13
How long is the delivery time?
More questions about our products?
Application & Dosage: Magnesium Sulfate Anhydrous
For WSF, compound fertilizers, granulated fertilizers, foliar products, fertigation products, liquid fertilizers and Mg/S premixes. Count MgSO4, MgO, Mg and S in formulation calculations and adjust from soil, irrigation-water, tissue analysis and registration requirements.
Fertilizer Manufacturing
- Highest-Analysis Mg/S Module:Calculate inclusion from MgSO4 > 98%, MgO > 32%, Mg > 19.2% and S > 25.5% for NPK, WSF, compound, granulated and liquid fertilizers.
- Compatibility Control:Validate water quality, pH, phosphates, carbonates, calcium salts and storage stability; use A/B tanks for concentrated stocks where needed.
Agricultural Application
- Root-Zone Mg/S Supply:Split applications during vegetative growth, fruit sizing, coloring and quality formation according to EC, pH, drainage and tissue analysis.
- Fast Foliar Correction:Spray low concentrations at early Mg deficiency; avoid heat and intense light, and jar-test mixes with pesticides or micronutrients.
Application Ratio Scheme
| Crop Name | Growth Stage | Application Ratio |
|---|---|---|
| Fertilizer formulation | WSF, compound, granulated or liquid fertilizer | Calculate from MgO > 32%, Mg > 19.2% and target guaranteed analysis |
| Fertigation/Sprinklers | Growth, fruit sizing or Mg deficiency correction | 4-12 kg/ha per application; adjust by analysis |
| Foliar spray | Early Mg deficiency or quality improvement | 0.2%-0.8%; test crop safety first |
| Soil or granulated fertilizer | Base dressing or top dressing formula | Follow soil testing, crop Mg demand and local label directions |
Product Advantages: Magnesium Sulfate Anhydrous
Ihumate Magnesium Sulfate Anhydrous delivers maximum Mg/S nutrient density, clean solubility and stable batch management for professional fertilizer manufacturers.
1
Maximum-Density Mg/S Source
MgSO4 > 98%, MgO > 32%, Mg > 19.2% and S > 25.5% support high-analysis fertilizer formulas.
2
Saves Formula Space and Freight
No crystal water means more active Mg/S per unit weight for export, compound fertilizer, granulation and concentrated WSF systems.
3
Supports Crop Quality and Stress Tolerance
Magnesium supports chlorophyll, sugar transport and dry matter; sulfur supports proteins, flavor, oils and stress-related metabolism.
4
Ihumate Export and OEM Support
Batch COA, SDS, export documents, reliable supply, formulation advice and 1-25 kg OEM/ODM packaging are available.
Certifications: Magnesium Sulfate Anhydrous
Ihumate is backed by globally recognized certifications.
- 🏅 OMRI Listed – Approved for organic use (USDA/NOP standards)
- 🏅 CERES Certified – High-standard organic inputs for sustainable agriculture
- ✔ Excellent international production process with full batch traceability
- ✔ Meeting the strict demands of global distributors and formulators
Ihumate Global Exhibition Videos
We showcase our Humic Acid, Seaweed, Liquid Fertilizer, and Bio-control series globally.
Join us at our 2026 exhibitions:
Event: Shanghai CAC (Fshow)
Booth: 12G05
Date: March 17-19, 2026
Address: No. 333 Songze Avenue, Qingpu District, Shanghai
Join us at our 2026 exhibitions:
Event: Shanghai CAC (Fshow)
Booth: 12G05
Date: March 17-19, 2026
Address: No. 333 Songze Avenue, Qingpu District, Shanghai
No. 64 Nangou, Chencun, Bailong Town, Huozhou City, Linfen City, Shanxi Province
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