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High thermal stability up to 250 °C continuous service temperature.
Excellent weathering and UV resistance for long-term outdoor performance.
Good compatibility with organic resins including acrylics, alkyds, and polyesters.
Low surface energy enabling superior water repellency and anti-graffiti properties.
Solvent-based formulation (xylene/toluene blend) for easy integration into conventional coating systems.
High-performance façade coatings for concrete and masonry substrates.
Heat-resistant topcoats for industrial metal structures and chimneys.
Water-repellent impregnation treatments for natural stone and brick.
Anti-graffiti clear coats for architectural and public infrastructure surfaces.
Hybrid silicone-acrylic exterior wall paints requiring enhanced durability.
| Chemical Type | Methyl-phenyl silicone resin |
| Product Form | Liquid, solvent-based solution |
| Appearance | Clear, colorless to pale yellow liquid |
| Solvent Content | Approx. 60–65 wt.% (xylene/toluene mixture) |
| Non-Volatile Content | 35–40 wt.% at 105 °C, 1 h |
| Viscosity (25 °C) | Approx. 20–30 mPa·s (Brookfield LVT, spindle #1) |
| Density (20 °C) | Approx. 0.87–0.89 g/cm³ |
| Flash Point (PMCC) | Approx. 25–30 °C |
Q1: What is the primary function of SILRES BS 290 in coating and ink formulations?
A: SILRES BS 290 is a methyl-phenyl silicone resin designed to enhance surface properties—particularly improving slip, scratch resistance, mar resistance, and substrate wetting—without significantly affecting gloss or transparency. It functions as a surface modifier that migrates to the film-air interface during drying or curing.
Q2: Is SILRES BS 290 compatible with common organic resin systems?
A: Yes, it demonstrates good compatibility with a wide range of thermosetting and thermoplastic resins, including acrylics, alkyds, polyesters, epoxy esters, and melamine-formaldehyde systems. Compatibility should always be verified experimentally in the final formulation due to variations in polarity, molecular weight, and solvent composition.
Q3: How is SILRES BS 290 typically incorporated into a formulation?
A: It is generally added during the let-down stage, dissolved or dispersed in suitable solvents (e.g., aromatic hydrocarbons, ketones, or esters) prior to incorporation. Pre-dilution helps ensure uniform distribution and minimizes the risk of surface defects. Dosage depends on formulation requirements but typically ranges from 0.1% to 2% by weight of total solids.
Q4: Does SILRES BS 290 require thermal curing to develop its full performance benefits?
A: While it provides immediate surface effects upon solvent evaporation, optimal crosslinking and long-term durability are achieved when integrated into thermally cured systems (e.g., stoving enamels). In ambient-cure systems, performance stabilization may depend on film formation kinetics and ambient conditions.
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