Quality First
Uncompromising standards for every product.
Innovation Driven
Constantly evolving to serve new markets.
Sustainable Growth
Committed to safe and eco-friendly practices.
Global Trust
Building long-lasting partnerships worldwide.
About us
At Hongda Chemical Co. Ltd, we are committed to delivering high-quality chemical solutions that power progress across industries. With a focus on innovation, safety, and sustainability, we provide a wide range of chemical products designed to meet the evolving needs of our global clients.
Our mission is simple: to combine advanced technology with reliable service, ensuring our partners achieve excellence in every application. Guided by integrity and a passion for growth, Hongda Chemical is proud to be a trusted name in the chemical industry.
Products
Black Iron Oxide 4330
Product Overview
Black Iron Oxide 4330 is a high-quality black colour (Fe₃O₄ – Magnetite) with excellent color strength, durability, and chemical stability. It is widely used in coatings, construction, plastics, ceramics, and magnetic applications.
With its fine particle size and consistent performance, Black Iron Oxide 4330 is one of the most reliable black colour in the global market.
HS Code
2821.10.00 – Iron oxides and hydroxides (including Black Iron Oxide)
ChemicaL Composition(%typical)
Fe₃O₄ (Iron Oxide): 95 – 98%
Fe₂O₃ (Ferric Oxide): < 2%
Silica (SiO₂) + Alumina (Al₂O₃): < 1%
Moisture (H₂O): < 1%
Trace Impurities: < 1%
Physical Properties
Appearance: Black powder or granular
Molecular Formula: Fe₃O₄
Density: ~5.2 g/cm³
Refractive Index: 2.42
Oil Absorption: 15–25 g/100 g pigment
pH (aqueous suspension): 5 – 8
Thermal Stability: Up to 1000 °C
Solubility:
Insoluble in water & organic solvents
Soluble in strong acids (HCl, H₂SO₄)
Applications
Paints & Coatings – Weather-resistant black colour
Construction Materials – Cement, tiles, pavers, concrete coloring
Plastics & Rubber – Black colour with high dispersibility
Ceramics & Glass – Heat-resistant glazes & enamels
Magnetic Uses – Magnetic tapes, toners, polishing compounds
Cosmetics (cosmetic grade) – Eyeliners, mascaras, natural colour
Foundry Industry – Refractory coating in molds and cores
Types of Iron Oxide Pigments
Black Iron Oxide (Fe₃O₄)
Red Iron Oxide (Fe₂O₃)
Yellow Iron Oxide (FeOOH)
Brown Iron Oxide – Mixture of Fe₂O₃, Fe₃O₄, FeOOH
Why Choose
High purity and stable performance
Excellent tinting strength and coverage
UV resistant and weather durable
Non-toxic and environmentally safe
Widely applicable across industries
Poly Aluminium Chloride (PAC)
Product Overview
Poly Aluminium Chloride (PAC) is a high-performance inorganic polymer coagulant widely used in water treatment, paper making, textiles, and industrial applications. Compared to traditional coagulants like alum, PAC offers faster
floc formation, stronger charge neutralization, and lower sludge volume, making it highly efficient and cost-effective.
HS Code
2827.32.00 – Aluminium salts (including Poly Aluminium Chloride)
Chemical Composition (%typical)
Al₂O₃ (Aluminium Oxide): 26 – 32%
Basicity (OH⁻ / Al³⁺ ratio): 40 – 90%
Insoluble Matter: ≤ 1.5%
Sulphates (SO₄²⁻): ≤ 3%
Iron (Fe): ≤ 0.05%
Moisture: ≤ 5% (powder)
pH (1% solution): 3.5 – 5.0
Physical Properties
Appearance: Yellow to light-yellow powder or liquid
Molecular Formula: [Al₂(OH)nCl₆₋n]m
Density (liquid): 1.12 – 1.20 g/cm³
Odor: Odorless
Stability: Stable in dry form; liquid PAC should be stored properly to prevent hydrolysis
Solubility:
In Water: Completely soluble, forming cationic hydrolyzed species that produce Al(OH)₃ flocs
In Organic Solvents: Insoluble
Applications
Water & Wastewater Treatment – Effective coagulant for drinking water, sewage, and industrial effluents
Paper Industry – Improves retention, sizing, and paper strength
Textiles & Dyeing – Acts as a dye-fixing agent
Oilfield & Petroleum – Separates oil from water during refining processes
Food & Beverage – Clarification of sugar, juices, and beverages (food-grade PAC)
Industrial Uses – Ceramics, leather processing, and cosmetics formulations
Types of PAC
Low Basicity PAC (10–40%) – For specialized industrial water treatment
Medium Basicity PAC (40–70%) – Commonly used for drinking water and wastewater
High Basicity PAC (70–90%) – High efficiency, preferred for potable water treatment
Food-Grade PAC – Safe for sugar refining, beverage clarification, and food processing
Industrial PAC – For wastewater, paper sizing, textile dyeing, oilfield water
Why Choose Our PAC?
High purity and consistent quality
Faster floc formation and stronger coagulation power
Lower chemical consumption compared to alum
Environmentally friendly with reduced sludge generation
Available in both powder and liquid forms
Calcium Chloride 74% Min
HS Code:28272000
Chemical Composition (%typical)
Calcium Chloride (CaCl₂): ≥ 74%
Magnesium & Alkali Salts (as MgCl₂, NaCl, KCl): ≤ 5%
Alkalinity (as Ca(OH)₂): ≤ 0.2%
Sulphates (SO₄²⁻): ≤ 0.2%
Water (H₂O): Balance
Physical Properties
Appearance: White or off white powder.
Odor: Odorless
Density: ~2.15 g/cm³
Melting Point: ~772°C
Boiling Point: Decomposes before boiling
pH (10% solution): 7.0–9.0
Hygroscopic Nature: Strongly absorbs moisture from air
Available Forms: powder
Solubility
Water: Highly soluble (745 g/L at 20°C); dissolution is exothermic (releases heat).
Alcohol: Slightly soluble.
Acetone: Insoluble.
Applications
De-icing & Snow Control: Effective road de-icing agent, faster than sodium chloride.
Dust Control: Used on unpaved roads, coal mines, and construction sites.
Construction Industry: Works as a concrete accelerator, improving early strength.
Oil & Gas Industry: Used in drilling and completion fluids, shale stabilization, and density control.
Food Industry (Food Grade only): Firming agent in canned foods, pickling agent, and cheese coagulant.
Chemical Industry: Brine solutions for refrigeration, drying agent, and as a raw material for calcium-based products.
Textiles & Paper Industry: Moisture control, sizing, and finishing processes.
contact information
Hongda Chemical Co. Ltd.
Address: No.188 , Shangcheng Avenue ,Yiwu ,Zhejiang Province , China
Phone: +8615822108190
E-mail: hongdachemical@gmail.com