Overview
Zinc sulfate heptahydrate (CAS 7446-20-0 ), commonly referred to as white vitriol, is an inorganic zinc salt used across agriculture, industrial processing, and nutrition applications. It delivers a soluble, bioavailable source of zinc for use in fertilizers and feed supplements.
In agriculture, it corrects zinc deficiency in crops when applied as a foliar spray or soil amendment, directly improving yield quality in zinc-sensitive crops such as cereals and legumes. This ensures optimal growth and health for various plant species.
Animal feed producers incorporate it as a zinc source in premixes and mineral supplements to meet livestock nutritional requirements. In water treatment, it functions as a coagulation aid and algaecide for controlling biological growth in reservoirs.
Textile and leather processors use it as a mordant and preservative in dyeing and tanning operations. Consistent zinc concentration is critical to process control in these industrial manufacturing environments to ensure high-quality finished goods.
Zinc sulfate heptahydrate is supplied as white crystalline powder or granules, with granulated forms preferred for fertilizer blending. Powder grades are typically used in liquid formulation and other specialized chemical processes.
Standard grades include technical, feed-grade, USP , and BP , with feed and pharmaceutical grades requiring documented purity and heavy metal limits. These certifications ensure the material meets strict safety and quality benchmarks.
Bulk supply is available in bags or big bags, with solution concentrations also offered for certain industrial applications. This flexibility in packaging allows for efficient logistics and handling across different sectors and global markets.
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Physical Properties
| Melting Point | 100 °C |
| Density | 1.97 g/cm³ |
| Appearance | Colorless crystals, small needles, or granular, crystalline powder; without odor; astringent, metallic taste. Efflorescent in air. Solutions acid to litmus. Loses 7H2O at 280C. Soluble in water and glycerol; insoluble in alcohol. |
| Color | White |
| Odor | odorless, astringent taste |
| Form | Solid |
| Water Solubility | 960 g/L |
| pH | 4-6 (50g/l, H2O, 20℃) |
Safety & Handling
Danger GHS05 GHS07 GHS09 GHS08 Hazard Statements H302 Harmful if swallowed H315 Causes skin irritation H316 Causes mild skin irritation H318 Causes serious eye damage H319 Causes serious eye irritation H335 May cause respiratory irritation H371 May cause damage to organs H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects Precautionary Statements P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 28332600 |
| UN Number | 3077 |
| ADR Class | 9 |
| Packing Group | III |
| Storage Class | 13 - Non Combustible Solids |
| WGK (Germany) | 3 |
Other Names
Related Products
Chemical Properties
- CAS Number
- 7446-20-0
- EC Number
- 616-097-3
- Mol. Weight
- 287.6
- HS Code
- 28332600
- Category
- Catalysts & Catalyst Precursors