Silica Dimethyl Silylate — Cosmetic Grade (INCI Name)
Silica Dimethyl Silylate is a dimethyldichlorosilane (DDS)-treated fumed silica with INCI name "Silica Dimethyl Silylate," providing a combination of silky, non-greasy skin feel, high oil absorption capacity, and SPF-boosting light-scattering properties not achievable with untreated hydrophilic fumed silica. The hydrophobic DDS surface modification makes it miscible with cosmetic oils and silicone fluids while remaining incompatible with water, enabling stable dispersions in anhydrous systems and W/O emulsions. Used in foundation, BB cream, sunscreen, and pressed powder, it delivers a premium matte-finish sensory profile adopted by top personal care brands.
Technical Specifications
| Properties and Test Methods | Unit | Typical Value | Standardization |
|---|---|---|---|
| Specific surface area (BET) | m²/g | 90 ~ 130 | GB/T 10722 |
| Carbon content | Wt% | 2.0 ~ 4.5 | GB/T 20020 |
| pH (in isopropanol/water 7:3) | – | 5.5 ~ 7.5 | Internal method |
| Loss on drying (2h @ 105°C) | Wt% | ≤ 0.5 | GB/T 5211.3 |
| Sieve residue (45 μm) | % | ≤ 0.05 | GB/T 5211.14 |
| Methanol wettability | % | ≥ 65 | Internal method |
| Heavy metals (as Pb) | ppm | ≤ 10 | Cosmetics standard |
INCI Name: Silica Dimethyl Silylate | CAS: 68909-20-6
Application Suggestions
Sunscreen and SPF Products
Provides dual functionality in sun care: UV light scattering that boosts SPF values at equivalent mineral UV filter loading, plus a silky, non-greasy afterfeel that overcomes the chalky, heavy texture associated with high-load ZnO/TiO2 sunscreens. Used at 1–3% in fluid sunscreens and 3–6% in SPF foundations.
Foundation, BB Cream, and Tinted Moisturizer
Delivers a soft-focus, pore-minimizing effect by filling micro-topography on the skin surface. The hydrophobic surface provides excellent oil absorption from sebum, extending wear time and maintaining a matte finish throughout the day. Compatible with silicone fluids, volatile silicones, and cosmetic esters.
Pressed Powder and Eyeshadow
Improves powder compressibility and payoff in pressed powder cosmetics. The hydrophobic surface reduces moisture uptake that causes powder caking, while the silky particle surface provides smooth skin application without grittiness. Used at 5–15% in compact powder formulations.
Loose Powder Anti-Caking
Functions as a flow aid and anti-caking agent in loose face powder, dry shampoo, and setting powder formulations. Prevents clumping during high-humidity storage and maintains free-flowing powder behavior in pump dispensers and sifter packaging.
Technical Support & FAQ: Silica Dimethyl Silylate
+Q1: What are the key features and applications?
Silica Dimethyl Silylate is the cosmetic fumed silica for premium sensory performance:
- Core Functions: Silky skin feel, oil absorption, SPF boost, anti-caking
- Key Features: INCI-named for cosmetic labeling; hydrophobic (compatible with oils/silicones); light-scattering for soft-focus effect
- Primary Applications: Sunscreen, foundation, BB cream, pressed powder, loose powder
+Q2: How does Silica Dimethyl Silylate compare with untreated fumed silica in cosmetics?
| Property | Hydrophilic Fumed Silica | Silica Dimethyl Silylate |
|---|---|---|
| Skin feel | Slightly tacky/dry | Silky, smooth |
| Oil phase compatibility | Poor | Excellent |
| Water phase compatibility | Good | Poor |
| SPF contribution | Minimal | Moderate (light scattering) |
| Matte finish | Moderate | Superior |
Equivalent to: AEROSIL® R972 (cosmetic grade), HDK® H18 (Wacker).
+Q3: What factors influence the pricing?
- Surface treatment cost: DDS treatment and cosmetic-grade purity testing
- INCI documentation: Regulatory support for cosmetic ingredient labeling
- Packaging: Small-lot cosmetic packaging options (1–5 kg bags) available
+Q4: What are the typical lead times and payment terms?
- Lead Time: Typically 7–14 days
- Payment Terms: T/T, L/C at sight, D/P
- Sample Support: Free samples (200g–500g) with INCI documentation for cosmetic formulation testing
Packing & Storage Information
Storage Conditions
Store in tightly sealed containers in a cool, dry area. Protect from humidity and moisture. Compatible with most cosmetic raw material storage conditions. Use within 2 years of manufacture date.