Zinc Sulphate Heptahydrate

Zinc Sulphate Heptahydrate is zinc sulphate with seven molecules of water of crystallisation: ZnSO4·7H2O, molecular weight 287.54 g/mol. Zinc makes up 22.74% of it by weight, calculated from that molecular weight.

It is an odourless, white crystalline powder or colourless crystals with an astringent taste. It is very soluble in water, about 1 g in 0.6 mL, and practically insoluble in alcohol. In dry air it slowly loses water (it is efflorescent).

The USP has a single Zinc Sulfate monograph covering both hydrates. For the heptahydrate it requires an assay of 99.0–108.7% ZnSO4·7H2O and limits lead to 20 ppm and arsenic to 14 ppm, and the label must state which hydrate it is and, for oral and injectable preparations, the elemental zinc content.

• Childhood diarrhoea: the WHO and UNICEF recommend zinc alongside low-osmolarity oral rehydration salts, and zinc sulphate 20 mg dispersible tablets are on the WHO Model List of Essential Medicines.
• Pharmaceuticals and supplements: tablets, capsules and syrups for zinc deficiency.
• Food fortification: a zinc source for fortified flour and cereal products.
• Nutritional premixes and nutraceuticals.
• Animal feed: a zinc source for all animal species.
• Agriculture: a zinc micronutrient fertiliser for zinc-deficient soils.

Both are the same zinc salt with different amounts of water. Agarwal Life Sciences manufactures both.

The monohydrate carries about 1.6 times as much zinc per kilogram, which usually makes it the more economical form where zinc is bought by content.

• United States: zinc sulphate is GRAS under 21 CFR 182.8997 when used in accordance with good manufacturing practice.
• European Union, food: a permitted form of zinc for adding to foods under Regulation (EC) No 1925/2006 and for food supplements under Directive 2002/46/EC.
• European Union, feed: zinc sulphate is authorised as a trace-element feed additive for all animal species under Commission Implementing Regulation (EU) 2016/1095.
• India: zinc sulphate is the zinc source named in FSSAI's fortification regulations for atta and maida (10–15 mg zinc per kg) and for cereal products and bakery wares.
• HS code: 2833.29, other sulphates. Confirm the national tariff line with your customs agent.

Agarwal Life Sciences packs Zinc Sulphate Heptahydrate in 25 kg paper bags with a liner, or in 50 kg HDPE drums.

Store it in tight containers in a cool place, as the crystals lose water in dry air. Zinc sulphate is harmful if swallowed, can cause serious eye damage and is very toxic to aquatic life, so wear eye protection, avoid release to drains, and follow the safety data sheet.

• Heptahydrate and monohydrate from one manufacturer, alongside our iron salts.
• BP, USP, FCC and Feed grades of the heptahydrate.
• 30 years of manufacturing experience, at two GMP plants at MIDC Boisar–Tarapur, Maharashtra.
• Certified to GMP, ISO 9001:2015, FSSC 22000 and FAMI-QS, with Halal and Kosher certification.
• Supplying customers in 39 countries; certificate of analysis and samples on request.