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High-purity, solvent-free silicone flake resin with excellent thermal stability.
Provides outstanding film-forming capability and uniform surface coverage in coatings and composites.
Offers superior compatibility with organic resins, silicones, and pigment systems.
Delivers enhanced scratch resistance and gloss retention in finished formulations.
Enables easy dispersion in both polar and non-polar media without requiring high-shear processing.
High-performance industrial coatings for metal and plastic substrates.
Functional additives in automotive clearcoats and OEM finishing systems.
Reinforcing filler in heat-resistant silicone elastomers and RTV sealants.
Surface modifier for powder coatings to improve flow, leveling, and mar resistance.
Key ingredient in specialty inks and overprint varnishes requiring durability and clarity.
| Chemical Type | Methyl/phenyl silsesquioxane (MQ-type) |
| Product Form | Free-flowing white to off-white flake solid |
| Appearance | Dry, crystalline flakes with consistent particle morphology |
| Primary Applications | Coatings, inks, sealants, and high-performance composites |
| Key Features | Solvent-free, thermally stable, low volatility, non-yellowing |
| Benefits | Improved hardness, enhanced weatherability, reduced surface tack |
| Storage Conditions | Store in original sealed container at 5–30°C; protect from moisture |
| Shelf Life | 24 months from date of manufacture under recommended storage |
Q1: What is the primary function of DOWSIL MQ-1640 in cosmetic and personal care formulations?
A: DOWSIL MQ-1640 is a silicone flake resin designed to provide high-slip, soft-focus visual effects and improved powder dispersion in leave-on and rinse-off products. It enhances sensory performance by delivering a silky, non-greasy skin feel while improving the suspension and stability of pigments and particulates.
Q2: Is DOWSIL MQ-1640 compatible with water-based systems?
A: Yes — DOWSIL MQ-1640 can be effectively dispersed in aqueous systems using appropriate high-shear mixing or pre-dispersion techniques. It is commonly used in emulsions, gels, and lotions, though optimal incorporation may require formulation-specific optimization of shear rate and temperature.
Q3: How does DOWSIL MQ-1640 differ from standard dimethicone or cyclomethicone?
A: Unlike linear or cyclic silicones, DOWSIL MQ-1640 is a branched, particulate silicone resin with a flake morphology. This structure provides unique rheological behavior, enhanced film-forming capability, and superior tactile benefits — including immediate slip and long-lasting smoothness — without significant volatility or migration.
Q4: Can DOWSIL MQ-1640 be used in anhydrous formulations?
A: Yes — it is fully compatible with oils, waxes, and other anhydrous vehicles. In stick or balm formats, it contributes to structural integrity, gloss control, and improved release from molds, while maintaining its characteristic sensory profile.
Q5: What is the typical dosage range for DOWSIL MQ-1640 in finished products?
A: Dosage depends on the desired effect and base formulation, but it is typically used at low concentrations — generally ranging from 0.1% to 2% by weight — to achieve optimal sensory enhancement and functional performance without compromising stability.
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