Copper Sulfate
Food grade Copper Sulfate
CAS:7758-98-7
Molecular formula: CuSO₄·5H₂O
Molecular weight: 249.7
What is calcium sulfate ？
KOSNATURE manufacture food grade copper sulfate, which having undergone special refinement with extremely high purity and the content of impurities (especially heavy metals such as arsenic and lead) strictly controlled within a safe range. Calcium sulfate for food is often used as a food additive or nutrient fortifier within prescribed ranges and limits, mainly for mineral fortification, such as in infant formula or beverages. Additionally, it serves as a process aid in food processing, for instance in the production of preserved eggs, or as a catalyst in certain foods.
Calcium sulfate solubility
Properties: Blue crystals or granules, or dark blue crystalline powder, with a metallic taste. It slowly decomposes in air. Above 150 degrees Celsius, it forms an easily hygroscopic colorless anhydrous copper sulfate. At 650 degrees Celsius, it decomposes into copper oxide. It is readily soluble in water, presenting an acidic nature, and soluble in dilute ethanol, but insoluble in absolute ethanol.
Our Specification
| Item | GB29210-2012 Specification |
|---|---|
| Appearance | Blue granular crystals or powder |
| Copper Sulfate (%, as CuSO₄) | 98.0–102.0 |
| Arsenic (As), ppm | ≤3 |
| Insoluble Substances in Ammonium Hydroxide, % | ≤0.3 |
| Lead (Pb), ppm | ≤4 |
| Iron (Fe), % | ≤0.01 |
Packaging: Inner lined with polyethylene plastic bags, outer wrapped in plastic woven bags, each bag with a net weight of 25 kilograms.
Storage and transportation: The packaging should be kept intact. Store in a dry, well-ventilated and clean warehouse, protected from water and moisture. It should be stored separately from toxic substances. The shelf life of this product is two years.
Calcium sulfate （E516 food additive）for food uses
| Food Category | Maximum Usage (as Cu) | Notes |
|---|---|---|
| Infant Formula Milk Powder | 3–12 mg/kg | Varies depending on product type for different groups |
| Infant Formula Food | 0.1–0.6 mg/100kJ (or 1.2–7.0 mg/100kcal) | Must strictly comply with stage standards |
| Older Infant & Young Child Formula Food | 0.2–1.2 mg/100kJ (or 1.2–7.0 mg/100kcal) | Must strictly comply with stage standards |
| Maternal Formula Milk Powder | 3–15 mg/kg | — |
| Beverages | 1–2 mg/kg | For solid beverages, increase proportionally according to dilution ratio |
| Instant Cereals | 3–10 mg/kg | Such as oatmeal, breakfast cereals |
Conversion:
If the dosage of Copper Sulfate (CuSO₄·5H₂O) is required, it should be calculated based on molecular weight.
The copper content in copper sulfate pentahydrate is approximately 25.5%.
Therefore, if 1 mg of copper needs to be added, about 1 / 0.255 ≈ 3.9 mg of food-grade copper sulfate is required.