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High thermal stability up to 250 °C continuous service temperature.
Excellent weather resistance and UV stability for long-term outdoor performance.
Good compatibility with organic resins (e.g., acrylics, alkyds) enabling hybrid formulations.
Low surface energy providing inherent water repellency and anti-graffiti properties.
Solvent-based liquid form ensuring easy handling and integration into conventional coating systems.
High-performance architectural coatings for façades and concrete protection.
Heat-resistant topcoats for industrial equipment and exhaust components.
Water-repellent impregnation treatments for natural stone and masonry.
Functional additives in silicone-modified paints and varnishes.
Base resin in durable anti-corrosion primers for metal substrates.
| Chemical Type | Methyl/phenyl silicone resin |
| Product Form | Liquid, solvent-based (xylene/butyl acetate blend) |
| Appearance | Clear to slightly hazy, colorless to pale yellow liquid |
| Solids Content | Approx. 45 wt.% |
| Viscosity (25 °C, DIN 53019) | 80–120 mPa·s |
| Density (20 °C) | 0.92–0.96 g/cm³ |
| VOC Content | ≈ 550 g/L (EU Paints Directive compliant) |
| Primary Applications | Coating additives, protective topcoats, hydrophobic impregnations |
Q1: What is the primary function of SILRES BS 45 in coating and ink formulations?
A: SILRES BS 45 functions as a hydrophobic, heat-curable silicone resin modifier that enhances surface hardness, scratch resistance, and water repellency while maintaining compatibility with organic binder systems such as acrylics, alkyds, and polyurethanes.
Q2: Is SILRES BS 45 suitable for use in high-solids or solvent-free systems?
A: Yes — SILRES BS 45 is supplied as a low-viscosity solution in aromatic solvents, making it well-suited for incorporation into high-solids coatings. It can also be adapted for solvent-free applications through careful formulation adjustments and optional solvent removal under controlled conditions.
Q3: How does SILRES BS 45 differ from other silicone resins like SILRES BS 16 or BS 69?
A: SILRES BS 45 offers a balanced combination of organic compatibility and silicone character — higher in methyl/phenyl ratio than BS 16 (which is more flexible) but less phenyl-rich than BS 69 (which delivers superior thermal stability). This makes BS 45 especially effective where surface performance and film integration are both critical.
Q4: What curing conditions are required to fully develop the properties of coatings containing SILRES BS 45?
A: Full property development typically requires thermal curing at elevated temperatures — generally above 120 °C — for sufficient time to drive condensation reactions and build the silicone network. Lower-temperature crosslinking may occur over extended periods, but optimal hardness and chemical resistance are achieved under standard industrial baking conditions.
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