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Exceptional lightfastness and weather resistance for long-term color stability in demanding outdoor applications.
High tinctorial strength with excellent dispersion characteristics in aqueous and solvent-based systems.
Non-toxic, sulfate-free formulation compliant with global regulatory standards including EN 71-3 and FDA guidelines for indirect food contact.
Thermally stable up to 250°C, retaining vivid blue hue without chalking or fading during processing.
Consistent particle size distribution ensuring uniform tinting and minimal batch-to-batch variation.
Architectural coatings and exterior wall paints requiring durable, fade-resistant blue tones.
Plastic coloration for polyolefins, PVC, and engineering resins used in automotive interiors and consumer goods.
High-performance inks for packaging gravure and flexographic printing on paper and film substrates.
Colored concrete and cementitious renders for façade and decorative construction elements.
Artist-grade acrylics, gouaches, and industrial art materials demanding archival pigment performance.
| Chemical Type | Sodium aluminum silicate polysulfide (synthetic ultramarine) |
| Product Form | Fine dry powder |
| Appearance | Brilliant violet-blue free-flowing powder |
| Primary Applications | Coatings, plastics, inks, construction materials, artists' colors |
| Key Features | Lightfastness: ASTM Level 8, Heat Stability: ≤250°C, pH Range: 5.5–9.0 |
| Benefits | Non-bleeding, non-migrating, low abrasivity, compatible with common dispersants |
| Heavy Metals Content | Complies with EU Directive 2009/48/EC (Toy Safety) and RoHS |
| Storage Conditions | Store in cool, dry place below 30°C; protect from moisture and direct sunlight |
Q1: What is the primary chemical composition and structural basis of Nubiola EP-19?
A: Nubiola EP-19 is a synthetic ultramarine pigment based on a sodalite-type aluminosilicate framework, with sulfur-containing chromophores (primarily S₃⁻ and S₂⁻ radical anions) responsible for its intense blue hue. It contains no heavy metals such as lead, cadmium, or cobalt.
Q2: Is EP-19 suitable for use in plastics exposed to high processing temperatures?
A: Yes — EP-19 exhibits good thermal stability up to approximately 200 °C, making it suitable for common thermoplastic processing methods including injection molding and extrusion. Performance at higher temperatures depends on residence time and polymer matrix compatibility.
Q3: How does EP-19 perform in acidic environments, and what pH range is recommended for aqueous applications?
A: Ultramarine pigments, including EP-19, are sensitive to low pH and may undergo color degradation or fading below pH 5.5. For stable performance in water-based systems, maintain neutral to slightly alkaline conditions (pH ≥ 7.0) and avoid strong acids or acidic additives.
Q4: What is the typical dosage range when using EP-19 in polymer masterbatches or coatings?
A: Dosage depends on the desired shade intensity and substrate opacity, but EP-19 is typically used at low concentrations — generally ranging from 0.1% to 2% by weight in final formulations. Optimal loading should be determined through application-specific trials.
Q5: Can EP-19 be used in food-contact plastics or packaging materials?
A: While EP-19 complies with major global regulatory frameworks for colorants in certain non-food-contact plastic applications, it is not authorized for direct food contact under current EU or FDA regulations. Always consult applicable local regulations and obtain formal compliance documentation before use in regulated applications.
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E-mail: wangxingqiang@ericwchem.com
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