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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.
Consistent particle size distribution for optimal dispersion and rheological behavior in coatings and inks.
Low soluble salt content, minimizing risk of corrosion in metal primers and protective coatings.
EC 1907/2006 (REACH) compliant with full SVHC screening documentation available.
Architectural and industrial coatings, including exterior wall paints and anticorrosive primers.
Cementitious products such as colored concrete, mortar, and tile grouts.
Plastic masterbatches for construction profiles, pipes, and outdoor furniture.
Printing inks for packaging and labeling requiring heat and light stability.
Construction adhesives and sealants where color consistency and alkali resistance are critical.
| Chemical Type | Synthetic α-Fe₂O₃ (hematite) |
| Product Form | Dry powder, free-flowing granules |
| Appearance | Reddish-brown powder with uniform hue |
| Primary Applications | Coatings, construction materials, plastics, inks |
| Key Features | High opacity, low oil absorption (~18 g/100g), pH-neutral |
| Benefits | Improved batch-to-batch reproducibility and reduced dispersion energy |
| Regulatory Compliance | REACH registered; RoHS compliant; non-hazardous per CLP |
| Storage Conditions | Store in dry, cool, well-ventilated area; protect from moisture |
Q1: What are the primary application areas for Nubiola R-5531?
A: Nubiola R-5531 is widely used in architectural coatings, industrial finishes, and cementitious systems such as mortars, renders, and concrete products. Its excellent lightfastness and thermal stability also make it suitable for high-temperature applications like ceramic glazes and refractory coatings.
Q2: How does R-5531 compare to other iron oxide red pigments in terms of tinting strength and dispersion behavior?
A: R-5531 offers high tinting strength and good dispersibility in both aqueous and solvent-based systems due to its optimized particle size distribution and surface treatment. It typically achieves uniform color development with reduced grinding effort compared to standard hematite grades, especially in demanding binder systems like acrylic emulsions and alkyds.
Q3: Is R-5531 suitable for use in food-contact or pharmaceutical-grade materials?
A: Nubiola R-5531 is not certified for direct food contact or pharmaceutical applications. It is formulated and tested for industrial and construction uses. For regulated applications, users must verify compliance with applicable local and regional safety requirements and consult Nubiola’s regulatory documentation for specific grade suitability.
Q4: What is the recommended dosage range when incorporating R-5531 into coatings or cementitious formulations?
A: Dosage depends on the desired shade intensity and base formulation, but R-5531 is typically used at low concentrations—generally ranging from 0.1% to 2% by weight relative to the total formulation. Optimal loading should be determined through lab-scale trials to balance color performance, rheology, and cost efficiency.
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E-mail: wangxingqiang@ericwchem.com
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