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High thermal stability up to 250 °C for extended service life in demanding environments.
Excellent weather resistance and UV stability, maintaining performance under prolonged outdoor exposure.
Good compatibility with organic resins (e.g., acrylics, alkyds) enabling hybrid formulation development.
Low surface energy providing superior water repellency and anti-fouling properties.
Reactive silanol groups allow crosslinking via condensation or with other functional resins.
High-performance architectural coatings for façades and concrete protection.
Heat-resistant industrial coatings for metal substrates and exhaust systems.
Water-repellent additives in mineral-based renders and plasters.
Key binder component in silicone-modified stucco and EIFS (Exterior Insulation and Finish Systems).
Functional additive in fire-retardant coatings to enhance char integrity and surface cohesion.
| Chemical Type | Methyl-phenyl silicone resin with reactive silanol groups |
| Product Form | Liquid, solvent-based (typically xylene or aromatic hydrocarbon blend) |
| Appearance | Clear, colorless to pale yellow liquid |
| Solids Content | Approx. 50–60 wt% (as supplied) |
| Viscosity (25 °C) | 100–300 mPa·s (Brookfield DV-II+ viscometer, spindle #3, 60 rpm) |
| Density (20 °C) | Approx. 0.92–0.96 g/cm³ |
| Primary Applications | Coating binders, hydrophobic modifiers, heat-resistant formulations |
| Key Features | Thermal stability, weather resistance, resin compatibility, hydrophobicity |
Q1: What is the primary function of SILRES WH in coating formulations?
A: SILRES WH acts as a reactive silicone resin modifier that enhances surface properties—such as water repellency, mar resistance, and substrate wetting—while maintaining compatibility with organic binder systems like acrylics, alkyds, and polyurethanes.
Q2: Is SILRES WH suitable for water-based systems?
A: Yes, SILRES WH is specifically designed for use in aqueous dispersions and emulsion-based coatings. It can be incorporated directly or via pre-dilution and generally remains stable under neutral to mildly alkaline pH conditions.
Q3: How does SILRES WH differ from standard silicone oils or fluid additives?
A: Unlike non-reactive silicone fluids, SILRES WH contains hydrolyzable alkoxy groups that enable covalent integration into the film-forming matrix during curing or drying—resulting in more durable, non-migrating performance and reduced risk of intercoat adhesion issues.
Q4: What are typical dosage recommendations for optimal performance?
A: Dosage depends on formulation requirements and desired performance balance, but SILRES WH is typically used at low concentrations—generally ranging from 0.1% to 2% by weight relative to total solids—to achieve surface modification without compromising film integrity or gloss.
Q5: Can SILRES WH be used in high-temperature cured systems?
A: Yes, SILRES WH exhibits good thermal stability and retains functionality in bake systems up to approximately 180 °C, making it suitable for industrial coil coatings and certain powder coating hybrid formulations where silicone-enhanced durability is required.
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