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High color strength and excellent tinting power in both aqueous and solvent-based systems.
Outstanding lightfastness and weather resistance, ensuring long-term color stability under UV exposure.
Optimized particle size distribution for smooth dispersion and low viscosity in pigment concentrates.
Good thermal stability up to 200 °C, suitable for high-temperature processing applications.
Low soluble salt content, minimizing corrosion risk in metal-coated substrates and concrete.
Architectural and industrial coatings including façade paints and maintenance coatings.
Cement-based products such as colored concrete, pavers, and tile grouts.
Plastics coloring for outdoor applications requiring UV durability.
Printing inks for packaging and labeling where color consistency and lightfastness are critical.
| Chemical Type | α-Fe₂O₃ (Hematite) |
| Product Form | Free-flowing, dry powder |
| Appearance | Red-brown powder with characteristic iron oxide hue |
| Primary Applications | Coatings, construction materials, plastics, inks |
| Key Features | High opacity, excellent dispersibility, low oil absorption |
| Benefits | Reduced dosage requirements, improved batch-to-batch consistency, minimal impact on rheology |
| pH (10% aqueous suspension) | 6.5 – 8.5 |
| Volatile Matter (105 °C, 2 h) | ≤ 0.5 wt.% |
Q1: What is the primary chemical composition and crystalline form of Bayferrox 4140?
A: Bayferrox 4140 is a synthetic, high-purity iron(III) oxide (Fe₂O₃) pigment in the hematite crystalline form. It is manufactured via the controlled precipitation and calcination of iron salts, resulting in consistent particle morphology and excellent coloristic properties.
Q2: Is Bayferrox 4140 suitable for use in coatings exposed to outdoor weathering?
A: Yes — Bayferrox 4140 exhibits outstanding lightfastness, UV stability, and resistance to atmospheric pollutants, making it well-suited for architectural and industrial coatings requiring long-term exterior durability and minimal color shift.
Q3: How does Bayferrox 4140 perform in water-based versus solvent-based systems?
A: Bayferrox 4140 is engineered for broad compatibility and demonstrates good dispersibility in both water-based acrylics and solvent-borne alkyd or polyurethane systems. Optimal performance requires appropriate wetting agents and dispersion protocols tailored to the specific medium.
Q4: Can Bayferrox 4140 be used in cementitious applications such as concrete coloration?
A: Yes — Bayferrox 4140 is widely used in concrete, mortar, and stucco formulations due to its alkali resistance, thermal stability during curing, and ability to deliver uniform, fade-resistant red-brown hues without compromising structural integrity.
Q5: What are typical dosage ranges when using Bayferrox 4140 in paint formulations?
A: Dosage depends on the desired opacity, color strength, and application method, but Bayferrox 4140 is typically used at low concentrations — generally ranging from 0.1% to 2% by weight of total formulation — due to its high tinting strength and efficient light absorption.
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E-mail: wangxingqiang@ericwchem.com
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