Physical Properties

• Appearance: White crystalline powder, odorless, uniform in particle size, no visible impurities, good fluidity, crystalline form stable under normal conditions.
• Melting Point: Approximately 100 °C (loses water of crystallization above this temperature); further decomposes when heated continuously.
• Boiling Point: Decomposes at approximately 280 °C (loses all water of crystallization); decomposes into zinc oxide and sulfur trioxide at high temperatures above 680 °C.
• Solubility: Soluble in water (approx. 57.7 g/100 mL at 20 °C), the solubility increases with the rise of temperature; slightly soluble in ethanol; insoluble in acetone and other non-polar organic solvents.
• Density: 3.31 g/cm3 (20 °C, lit.), bulk density 500-550 kg/m3.
• Optical Activity: No optical activity, no chiral center, no racemic mixture.
• Moisture Absorption: Hygroscopic, prone to absorbing moisture and caking when exposed to air for a long time, especially in high humidity environments.
• pH Value: 4.0–6.0 (5% aqueous solution, 20 °C); refractive index n20/D 1.658 (estimate); vapor pressure <0.0001 hPa (20 °C).

Chemical Properties

• Chemical Category: Inorganic zinc salt, hydrate, also known as Zinc sulfate monohydrate, monohydrate zinc sulfate; belongs to the category of metal sulfates.
• Stability: Stable under normal temperature and pressure (sealed); stable in dry air; incompatible with strong oxidants and strong bases; easy to lose crystal water and become anhydrous zinc sulfate when heated.
• Acid-Base Property: Weakly acidic; its aqueous solution is acidic, which is due to the hydrolysis of zinc ions; it can react with strong bases to form zinc hydroxide precipitate, which can dissolve in excessive strong bases.
• Decomposition: Loses water of crystallization at 280 °C to form anhydrous zinc sulfate; decomposes into zinc oxide and sulfur trioxide at high temperatures above 680 °C; does not undergo obvious hydrolysis under normal storage conditions.
• Photostability: Relatively stable to light; no obvious discoloration or decomposition under long-term light exposure; can remain stable in dry and dark environment for a long time.
• Reactivity: Can react with bases, carbonates, and sulfides to form corresponding precipitates; low toxicity (LD50 orally in rats: >2000 mg/kg); non-flammable and non-explosive under normal conditions; has astringent and antimicrobial properties.

Chemical Structure

Applications

• Agricultural industry: Used as zinc fertilizer to prevent and cure crop zinc deficiency (such as corn white leaf disease, rice dwarf disease), suitable for corn, rice, fruit trees, vegetables and other crops; can be used as base fertilizer, topdressing and foliar fertilizer.
• Feed industry: Used as a zinc supplement in feed to promote animal growth and development, improve immunity and reproductive performance, and prevent animal zinc deficiency diseases.
• Chemical industry: Raw material for manufacturing zinc salts, lithopone, pigments and other products; used as a mordant in dyeing and printing industry, and a stabilizer in water treatment industry.
• Electroplating industry: Main salt for zinc plating solutions, which can enhance the corrosion resistance and uniformity of the coating, and improve the quality of the plating layer.
• Other fields: Used in medicine as an astringent and emetic; used in wood preservation and artificial fiber industry; also used as an additive in oral care products for its antimicrobial and antiplaque effects.

Storage & Handling

• Storage: Store in a sealed container in a cool, dry, well-ventilated warehouse; protect from sunlight, heat, and moisture; keep away from strong oxidants, strong bases and food, and avoid mixed storage.
• Temperature: Room temperature (≤25 °C) for long-term storage; avoid high temperatures and rapid temperature changes; shelf life 12 months under proper storage conditions.
• Packaging: Sealed plastic drum or woven bag with inner plastic lining (25kg/50kg), moisture-proof and sealed to prevent moisture absorption and caking; small packages can use sealed glass bottles or aluminum foil bags.
• Precautions: Operate in a well-ventilated environment; avoid inhaling dust and direct skin/eye contact; wear protective gloves, goggles and dust mask during operation; rinse with plenty of clean water immediately if contacted accidentally; dispose of waste in accordance with industrial waste regulations; the spilled material should be collected and disposed of properly to avoid environmental pollution.

Description