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Exceptional lightfastness and weather resistance for long-term color stability.
High tinctorial strength with intense, clean blue-violet hue.
Excellent dispersibility in aqueous and solvent-based systems.
Non-toxic, sulfate-free formulation compliant with global regulatory standards.
Thermally stable up to 250 °C, suitable for medium-temperature processing.
Architectural and industrial coatings requiring durable blue pigmentation.
Plastic coloration for polyolefins, ABS, and PVC in extrusion and injection molding.
Printing inks for packaging and decorative applications.
Artists’ acrylics, gouaches, and water-based decorative paints.
Specialty concrete and plaster tinting for interior and exterior finishes.
| Chemical Type | Sodium aluminum silicate sulfide (synthetic ultramarine) |
| Product Form | Fine free-flowing powder |
| Appearance | Deep violet-blue granular powder |
| Primary Applications | Coatings, plastics, inks, artists’ colors, construction materials |
| Key Features | Lightfast, non-toxic, alkali-stable, sulfate-free |
| Particle Size (D50) | 8–12 µm |
| pH (5% aqueous suspension) | 7.5–9.0 |
| Volatile Matter (105 °C, 2 h) | ≤ 3.0 wt% |
Q1: What is the primary chemical composition and structural basis of Nubiola FG-75?
A: Nubiola FG-75 is a synthetic ultramarine pigment based on a sodium aluminosilicate framework with polysulfide chromophores. Its intense blue color arises from the S₃⁻ radical anions trapped within the β-cage structure of the sodalite lattice.
Q2: Is FG-75 suitable for use in heat-sensitive polymer applications such as polyolefins or PVC?
A: Yes — FG-75 exhibits good thermal stability up to approximately 180–200 °C under typical processing conditions, making it suitable for extrusion and injection molding of common thermoplastics. However, prolonged exposure above 220 °C may lead to partial desulfurization and color shift.
Q3: How does FG-75 perform in acidic environments, and what pH range should be avoided?
A: Ultramarine pigments, including FG-75, are inherently sensitive to acidic media. Discoloration may occur below pH ~5.5 due to degradation of the polysulfide species; therefore, it is not recommended for acidic coatings, adhesives, or low-pH cosmetic formulations.
Q4: Can FG-75 be used in food-contact plastics or toys?
A: Nubiola FG-75 is manufactured and tested to meet applicable global regulatory expectations for non-food-contact colorants. It is not approved for direct food contact or intended for use in toys subject to strict migration limits without prior validation by the formulator against applicable regional requirements.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
