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Send EmailAerosil R 202, Hydrophobic Silica, Fumed Silica, Pyrogenic Silica, 68909-20-6
AEROSIL R 202
SECTION 1: PRODUCT IDENTITY AND CHEMICAL IDENTIFICATION
| Parameter | Information |
|---|---|
| Product Name | Aerosil R 202 |
| Chemical Description | Surface-modified amorphous silica (hydrophobized with organic silane) |
| CAS Number | 68909-20-6 |
| EINECS Number | 272-697-1 |
| Molecular Structure | Amorphous SiO₂ |
| Chemical Class | Hydrophobic fumed silica (pyrogenic silica) |
| Surface Modification | Organic silane (polydimethylsiloxane) |
| Physical State (20°C) | Solid (fine powder) |
| Color | White |
| Odor | Odorless |
| Type | Hydrophobic |
SECTION 2: CHEMICAL STRUCTURE
Structure Description:
O
‖
—Si—O—Si—O—Si—
| | |
O O O
| | |
—Si—O—Si—O—Si—
| | |
CH₃ CH₃ CH₃
| | |
Si Si Si
| | |
…CH₃ …CH₃ …CH₃
Aerosil R 202
Amorphous silica (SiO₂) network surface-modified
with organic silane (polydimethylsiloxane)
Simplified Structure:
SiO₂ (Amorphous) — Surface Modification: —Si(CH₃)₃ groups
Aerosil R 202
Hydrophobic Fumed Silica
| Parameter | Description |
|---|---|
| Base Material | Fumed (pyrogenic) silica (SiO₂) |
| Surface Modification | Treated with polydimethylsiloxane (PDMS) |
| Surface Property | Hydrophobic |
| Surface Groups | -Si(CH₃)₃ (trimethylsilyl) |
| Surface Area (BET) | ~100-130 m²/g |
| Primary Particle Size | 7-14 nm |
| Agglomerate Size | ~1-10 μm |
| Tapped Density | ~50-70 g/L |
| pH (4% Aqueous Dispersion) | 4.0 – 6.0 |
SECTION 3: PHYSICAL AND CHEMICAL PROPERTIES
| Property | Value | Test Method / Note |
|---|---|---|
| Appearance | White, fine powder | Visual |
| Odor | Odorless | Olfactometric |
| SiO₂ Content | ≥99.0% | Gravimetric |
| Tapped Density | ~50-70 g/L | ASTM D4164 |
| True Density | ~2.2 g/cm³ | - |
| Surface Area (BET) | 100-130 m²/g | DIN 66131 |
| Primary Particle Size | 7-14 nm | TEM / SEM |
| Agglomerate Size | ~1-10 μm | Laser Diffraction |
| pH (4% Aqueous Dispersion) | 4.0 – 6.0 | DIN EN ISO 787-9 |
| Loss on Drying (105°C) | ≤1.0% | Gravimetric |
| Loss on Ignition (1000°C) | ≤4.0-6.0% | Gravimetric |
| Carbon Content | ~2.0-4.0% | Elemental Analysis |
| Hydrophobicity | Hydrophobic (water-repellent) | Test |
| Water Solubility | Insoluble | General Method |
| Dispersion in Organic Solvents | Dispersible (liquid oils, esters, alcohols) | General Method |
| Flash Point | >200°C | - |
| Melting Point | >1000°C (glass melting) | - |
| Optical Properties | Transparentizing | - |
| Dusting | Low (hydrophobic) | - |
SECTION 4: AEROSIL GRADES COMPARISON
| Property | Aerosil R 202 | Aerosil 200 | Aerosil R 972 | Aerosil 300 |
|---|---|---|---|---|
| Surface Property | Hydrophobic | Hydrophilic | Hydrophobic | Hydrophilic |
| Surface Area (BET) | 100-130 m²/g | 175-225 m²/g | 90-130 m²/g | 300-350 m²/g |
| Modification | PDMS | None | DDS | None |
| Carbon Content | ~2-4% | None | ~1-2% | None |
| Primary Particle (nm) | 7-14 | 12 | 16 | 7 |
| pH (4% Aqueous) | 4.0-6.0 | 3.8-4.5 | 3.8-5.0 | 3.8-4.5 |
| Tapped Density (g/L) | ~50 | ~50 | ~50 | ~50 |
| Main Application | Cosmetics, pharmaceuticals, oily systems | General purpose, water-based | Epoxy, oily systems | High viscosity, film |
| Hydrophobicity | High | Low | High | Low |
SECTION 5: FUNCTIONAL PROPERTIES
| Property | Description |
|---|---|
| Thickener | Increases viscosity in formulations; Provides non-Newtonian flow behavior; High rheological effect at low concentrations. |
| Emulsifier | Stabilizes oil-water emulsions; Prevents emulsion separation; Reduces surfactant requirements. |
| Rheology Control | Regulates flow properties; Provides thixotropic behavior; Application ease and flow control. |
| Flow Regulator | Improves flowability in powder formulations; Prevents caking and sticking; Acts as lubricant and glidant in tablet production. |
| Hydrophobicity | Water-repellent property; Dispersibility in organic systems; Effectiveness in oily formulations. |
| Transparentizing Agent | Improves optical properties; Reduces cloudiness; Provides transparency in film-forming systems. |
SECTION 6: MAIN APPLICATION AREAS
| Industry / Application | Function | Typical Concentration |
|---|---|---|
| Cosmetics (Creams, Lotions) | Thickener, emulsifier, rheology control | 0.5-5% |
| Cosmetics (Makeup, Sunscreens) | Thickener in oily systems, water resistance | 0.5-3% |
| Pharmaceutical (Tablets) | Flow regulator, glidant, lubricant | 0.1-1% |
| Pharmaceutical (Capsules) | Flow regulator, anti-adherent | 0.1-1% |
| Pharmaceutical (Topical Creams) | Thickener, emulsion stabilizer | 0.5-3% |
| Food Additive | Flow regulator, anti-caking agent | 0.1-1% |
| Paints and Coatings | Rheology control, viscosity adjustment | 0.5-5% |
| Adhesives and Sealants | Thickener, flow control | 0.5-3% |
| Epoxy and Resin Systems | Rheology control, sag resistance | 0.5-3% |
| Spray and Aerosol | Suspension stabilizer | 0.5-2% |
SECTION 7: FORMULATION GUIDELINES
| Parameter | Recommendation |
|---|---|
| Concentration | Typical concentration: 0.5-5% (depending on formulation) |
| Addition Method | Dispersion with high-speed mixing; Recommended to add at final stage; Disperse using three-roll mill or high-shear mixer. |
| Dispersion Medium | Dispersible in oily systems (mineral oil, esters, silicone oils, triglycerides); Not dispersible in water; Dispersible in organic solvents. |
| pH Range | Stable in pH 4.0 – 9.0; Stable in acidic and basic environments. |
| Temperature Resistance | Stable from -20°C to +200°C; Avoid prolonged exposure at high temperatures. |
| Activation | Pre-wetting recommended; High effect even at low concentrations; Activated by high shear force. |
| Compatibility | Compatible with most organic components; Compatible with polymers, oils, resins, solvents; Thixotropic effect at high concentrations. |
| Synergistic Effects | Combination with other hydrophobic silicas (Aerosil R 972); Use with organo-clays, polymers; Synergy with viscosity enhancers. |
| Dust Control | Should be used to minimize dust formation; Well-ventilated area; Dust mask recommended. |
SECTION 8: SAMPLE FORMULATIONS
Skin Cream (For Oily Skin):
| Component | Quantity |
|---|---|
| Aerosil R 202 | 1.0% |
| Water | 75.0% |
| Oil Phase (liquid oils, emulsifiers) | 20.0% |
| Preservatives, Fragrance | As required |
Instructions: Add to oil phase; Disperse with high-speed mixing; Emulsify with water phase; Homogenize.
Tablet Flow Regulator (Pharmaceutical):
| Component | Quantity |
|---|---|
| Aerosil R 202 | 0.2-0.5% |
| Active Ingredient | As required |
| Excipients (Filler, Binder) | As required |
Instructions: Add during final mixing stage; Ensure homogeneous blend; Direct compression or granulation.
SECTION 9: QUALITY SPECIFICATIONS
| Parameter | Specification | Test Method |
|---|---|---|
| Appearance | White, fine powder | Visual |
| SiO₂ Content | ≥99.0% | Gravimetric |
| Surface Area (BET) | 100-130 m²/g | DIN 66131 |
| Primary Particle Size | 7-14 nm | TEM / SEM |
| pH (4% Aqueous Dispersion) | 4.0 – 6.0 | DIN EN ISO 787-9 |
| Loss on Drying (105°C) | ≤1.0% | Gravimetric |
| Loss on Ignition (1000°C) | ≤4.0-6.0% | Gravimetric |
| Carbon Content | ~2.0-4.0% | Elemental Analysis |
| Tapped Density | 50-70 g/L | ASTM D4164 |
| Hydrophobicity | Hydrophobic | Test |
| Heavy Metals (Pb) | ≤10 ppm | ICP-MS |
| Arsenic (As) | ≤2 ppm | ICP-MS |
| Lead (Pb) | ≤3 ppm | ICP-MS |
| Cadmium (Cd) | ≤1 ppm | ICP-MS |
| Mercury (Hg) | ≤1 ppm | ICP-MS |
| Microbiological Purity | TAMC ≤10² CFU/g; TYMC ≤10¹ CFU/g | USP <61> |
| E. coli | Negative in 1g | USP <62> |
| Salmonella spp. | Negative in 25g | USP <62> |
SECTION 10: SAFETY PROFILE AND TOXICOLOGICAL ASSESSMENT
| Parameter | Value / Description |
|---|---|
| GHS Classification | Not classified as hazardous substance |
| Signal Word | None (not hazardous) |
| Hazard Pictograms | None |
| Hazard Statements (H-Codes) | None |
| Acute Oral Toxicity (LD50, Rat) | >5000 mg/kg (low toxicity) |
| Acute Inhalation Toxicity | Dust inhalation may cause irritation |
| Skin Irritation | Not irritant |
| Eye Irritation | May cause mild irritation (mechanical) |
| Skin Sensitization | Does not cause sensitization |
| Carcinogenicity | Not classified as carcinogenic |
| Mutagenicity | Not mutagenic |
| Reproductive Toxicity | No reproductive toxicity |
| Target Organs | Respiratory tract (dust) |
| Occupational Exposure Limit | 4 mg/m³ (8-hour TWA) |
| Systemic Toxicity | Low |
| Ecology | Insoluble in water; Low toxicity |
SECTION 11: GHS CLASSIFICATION AND LABELING
GHS Classification (in accordance with 1272/2008/EC):
| Hazard Class | Category | H-Statement |
|---|---|---|
| Not classified as hazardous substance | – | – |
Signal Word: None (Not classified as hazardous)
Hazard Pictograms: None
NFPA 704 Hazard Classification:
| Health | Flammability | Reactivity | Special |
|---|---|---|---|
| 1 | 0 | 0 | - |
| (Minimal health hazard) | (Non-combustible) | (Stable) | (None) |
SECTION 12: PRECAUTIONARY STATEMENTS (P-CODES)
| Code | Statement |
|---|---|
| P261 | Avoid breathing dust/fume/gas |
| P264 | Wash hands thoroughly after handling |
| P271 | Use only outdoors or in a well-ventilated area |
| P280 | Wear protective gloves/protective clothing/eye protection/face protection |
| P304+P340 | IF INHALED: Remove person to fresh air and keep comfortable for breathing |
| P305+P351+P338 | IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present and continue rinsing |
| P403+P233 | Store in a well-ventilated place. Keep container tightly closed |
| P501 | Dispose of contents/container in accordance with local/regional/national/international regulations |
SECTION 13: FIRST AID MEASURES
| Route of Exposure | Action |
|---|---|
| Inhalation | If inhaled as powder, move to fresh air. Seek medical attention if respiratory symptoms persist. |
| Skin Contact | Remove contaminated clothing. Wash with plenty of soap and water. Seek medical attention if irritation develops. |
| Eye Contact | Rinse thoroughly with plenty of water for at least 15 minutes. Keep eyelids open. Remove contact lenses if present. Seek medical attention if irritation persists. |
| Ingestion | Rinse mouth with water. Do NOT induce vomiting. Drink 1-2 glasses of water. Seek medical attention. |
| Note | Symptomatic treatment is administered. No specific antidote available. |
SECTION 14: FIREFIGHTING MEASURES
| Parameter | Information |
|---|---|
| Fire Hazard | Non-combustible. Remains as inert powder at high temperatures. |
| Fire-Related Hazards | No thermal decomposition products (inorganic). |
| Suitable Extinguishing Media | Water mist, CO₂, dry chemical powder, foam. |
| Unsuitable Extinguishing Media | Water jet (may spread dust) |
| Special Protective Equipment | Self-contained breathing apparatus (SCBA), full protective clothing. |
| Special Precautions | Prevent dust from entering sewers and water bodies. |
SECTION 15: STORAGE AND SHELF LIFE
| Parameter | Information |
|---|---|
| Storage Conditions | Store in a cool, dry, well-ventilated area; protect from direct sunlight and moisture. |
| Temperature Limits | 15-25°C (ideal); do not exceed 30°C |
| Humidity | Low humidity environment |
| Light | No light protection required |
| Container Requirements | Tightly closed, moisture-resistant containers (PE-lined bags, HDPE containers) |
| Incompatible Materials | Strong alkalis, hydrofluoric acid |
| Shelf Life | 24-36 months (unopened original packaging, under proper storage conditions) |
| Shelf Life (After Opening) | 12-24 months (under proper storage conditions) |
| Signs of Degradation | Caking, moisture absorption (loss of hydrophobicity), reduced flowability |
| Stability Warning | Stable under normal conditions; Hydrophobicity may decrease over time in high humidity |
SECTION 16: PACKAGING OPTIONS
| Packaging Type | Quantity / Capacity | Material | Application Area |
|---|---|---|---|
| PE-Lined Kraft Bag | 10 kg, 20 kg | Kraft paper / PE liner | Industrial supply |
| Multi-layer Paper Bag | 10 kg, 20 kg | Paper (air and moisture-proof) | Industrial, food |
| HDPE Drum | 10 kg, 20 kg | HDPE (opaque, moisture barrier) | Pharmaceutical, cosmetic |
| Aluminum Foil Bag | 1 kg, 5 kg | Aluminum / PE (moisture-proof) | High purity, pharmaceutical |
| IBC Container | 500 kg, 1000 kg | UV-protected HDPE | Large-scale industrial supply |
SECTION 17: TRANSPORTATION INFORMATION
| Parameter | Information |
|---|---|
| UN Number | Not applicable (not classified as dangerous substance) |
| Hazard Class | Not applicable |
| Packing Group | Not applicable |
| ADR/RID | Not classified as dangerous goods |
| IMDG Code | Not marine pollutant |
| IATA (Air) | Not classified as dangerous goods; can be transported by air |
| Transport Temperature | Ambient temperature; protect from moisture |
| Transport Precautions | Moisture-proof packaging |
| Spill Cleanup | Collect mechanically; clean with absorbent material; avoid dust generation |
| Marine Pollutant | No |
SECTION 18: REGULATORY STATUS
| Region / Authority | Status |
|---|---|
| USA (FDA) | GRAS (21 CFR 182.1711); Approved as food additive |
| USA (EPA) | Listed as inert ingredient |
| European Union (EC) | Approved as food additive (E551) |
| Turkey | Approved as food additive, pharmaceutical and cosmetic excipient; Subject to KKDIK regulation |
| ECHA (REACH) | Registered substance |
| TSCA (USA) | Listed |
| California (Prop 65) | Not listed |
| Halal | Yes (synthetic, not animal-derived) |
| Kosher | Yes (with certification) |
| Vegan | Yes (synthetic) |
SECTION 19: OTHER NAMES AND SYNONYMS
| Type | Name |
|---|---|
| Turkish Names | Aerosil R 202, Hidrofobik Silika, Fumed Silika |
| English Names | Aerosil R 202, Hydrophobic Silica, Fumed Silica, Pyrogenic Silica |
| CAS Number | 68909-20-6 |
| EINECS Number | 272-697-1 |
| E Number | E551 (food additive) |
| HS Code | 2811.22 |
SECTION 20: SUMMARY TABLE
| Parameter | Value |
|---|---|
| CAS Number | 68909-20-6 |
| Chemical Structure | Amorphous SiO₂ (surface-modified) |
| Appearance | White, fine powder |
| Surface Property | Hydrophobic |
| Surface Area (BET) | 100-130 m²/g |
| Primary Particle Size | 7-14 nm |
| pH (4% Aqueous) | 4.0 – 6.0 |
| SiO₂ Content | ≥99.0% |
| Primary Function | Thickener, emulsifier, rheology control, flow regulator |
| Main Applications | Cosmetics, pharmaceuticals, food, industrial |
| Shelf Life | 24-36 months |
| Storage | Cool, dry, air-tight |
| GHS Classification | Not hazardous |
| UN Number | Not applicable |
| FDA Status | GRAS (21 CFR 182.1711) |
| Halal / Kosher / Vegan | Yes |
SECTION 21: CRITICAL WARNINGS AND BEST PRACTICES
CRITICAL WARNINGS:
Dust Control: Should be used to minimize dust formation. Airborne dust concentrations may cause respiratory irritation.
Hydrophobicity: Water-repellent; does not disperse in water-based systems. Should only be dispersed in oily and organic systems.
Dispersion: Requires high shear force for dispersion; low shear force results in insufficient dispersion.
Storage: Must be protected from moisture; moisture may reduce hydrophobicity.
Temperature: Avoid prolonged exposure at high temperatures (>200°C).
Incompatible Materials: Do not contact with strong alkalis (NaOH, KOH) and hydrofluoric acid (HF).
BEST PRACTICE RECOMMENDATIONS:
Concentration: Typical concentration 0.5-5%; adjust according to desired viscosity.
Addition Method: Add during final stage of formulation; disperse with high-speed mixing.
Pre-dispersion: Pre-wetting improves dispersion; wet in oil phase.
High Shear: Use three-roll mill or high-shear mixer for dispersion.
pH Control: Stable in pH 4.0-9.0; stable in acidic and basic environments.
Synergy: Can be used with other hydrophobic silicas or organo-clays.
Personal Protective Equipment: Dust mask (N95/FFP2), safety goggles, protective clothing.
Hygiene: Wash hands thoroughly after handling; Do not eat, drink or smoke when using this product.
Quality Control: Regularly perform surface area (BET), pH, loss on drying, carbon content, microbiological purity tests.
Storage: Store in cool, dry, air-tight containers. Keep tightly closed after opening.
LEGAL DISCLAIMER:
The information provided in this document is based on our current knowledge and experience and is presented in good faith. However, as all conditions of use are beyond our control, it does not constitute a binding specification or guarantee. This Technical Data Sheet is for informational purposes only. Users are responsible for testing suitability for their own applications and for complying with all local, regional, and national regulations. For complete safety, storage, use, handling, waste, and regulatory compliance information, please refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier.