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Highly dispersible precipitated silica with optimized particle size distribution for uniform pigment stabilization.
Enhanced rheology control in liquid systems, reducing sedimentation and improving storage stability.
Low abrasivity compared to fumed silicas, preserving equipment integrity during processing.
Excellent compatibility with organic solvents, water-based media, and resin systems across diverse formulations.
Consistent batch-to-batch performance ensured by Solvay’s stringent GMP-aligned manufacturing standards.
Water-based architectural coatings requiring anti-settling and gloss retention.
Industrial maintenance paints where long-term pigment suspension and shear stability are critical.
UV-curable inks and varnishes needing low-viscosity thixotropy without compromising cure efficiency.
Automotive refinish coatings demanding high transparency and minimal haze development.
Specialty printing inks including flexographic and gravure formulations for improved print definition.
| Chemical Type | Precipitated amorphous silica |
| Product Form | Free-flowing white powder |
| Appearance | White, odorless, non-toxic powder |
| BET Surface Area | 140–160 m²/g |
| Loss on Ignition (105°C, 2h) | 5.0–7.0 wt% |
| SiO₂ Content | ≥92 wt% |
| Residue on 45 µm Sieve | ≤0.1 wt% |
| pH (4% aqueous slurry) | 5.5–7.0 |
Q1: What is the primary function of Solvay ZEOSIL 155 Pigment in polymer systems?
A: Solvay ZEOSIL 155 Pigment is a high-purity, surface-modified synthetic silica primarily used as a functional white pigment and reinforcing filler. It imparts opacity, brightness, and improved mechanical properties while maintaining good dispersion and processability in thermoplastics, elastomers, and coatings.
Q2: How does Solvay ZEOSIL 155 differ from conventional precipitated silicas or fumed silica?
A: Unlike standard precipitated silicas, ZEOSIL 155 features controlled particle size distribution and tailored surface chemistry optimized for pigmentary performance—emphasizing light scattering efficiency and compatibility in organic matrices. It is not designed for thickening or rheology control like fumed silica, nor does it serve as a primary reinforcing agent like high-surface-area silicas in tire tread compounds.
Q3: Is Solvay ZEOSIL 155 Pigment suitable for use in food-contact or pharmaceutical applications?
A: Solvay ZEOSIL 155 Pigment is manufactured to high chemical purity standards and is commonly evaluated for use in regulated applications. However, its suitability for direct food contact or pharmaceutical use depends on final formulation validation, regulatory review, and compliance with applicable regional requirements—including intended exposure conditions and migration assessments.
Q4: What are typical processing considerations when incorporating ZEOSIL 155 into polymer melts?
A: Due to its fine particle nature and surface treatment, ZEOSIL 155 generally disperses well under standard compounding conditions (e.g., twin-screw extrusion). Pre-drying is recommended if moisture sensitivity is a concern in the host polymer. Optimal dispersion typically benefits from moderate shear and residence time—dosage depends on formulation requirements but generally ranges from 0.1% to 2% by weight for pigmentary effect.
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