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Send EmailCyclopentasiloxane, Decamethyl Cyclo Penta Siloxane, D5, 541-02-6
CYCLOPENTASILOXANE (D5)
SECTION 1: PRODUCT IDENTITY AND CHEMICAL IDENTIFICATION
| Parameter | Information |
|---|---|
| Product Name | Cyclopentasiloxane |
| Chemical Name | Decamethylcyclopentasiloxane |
| Other Names | D5, Decamethylcyclopentasiloxane |
| CAS Number | 541-02-6 |
| EC Number (EINECS) | 208-764-9 |
| Molecular Formula | C₁₀H₃₀O₅Si₅ |
| Molecular Weight | 370.77 g/mol |
| Chemical Class | Cyclic siloxane; Silicone-based compound |
| INCI Name | Cyclopentasiloxane |
| Physical Form | Clear, colorless liquid |
| Odor | Slight characteristic odor |
| Solubility | Soluble in oils and organic solvents; insoluble in water |
SECTION 2: CHEMICAL STRUCTURE
CH₃ CH₃
| |
Si——O——Si——O
/ \ / \
CH₃ O O CH₃
| |
Si——O——Si
/ \ / \
CH₃ O CH₃ CH₃
|
Si
/ \
CH₃ CH₃
Cyclopentasiloxane (D5)
Decamethylcyclopentasiloxane
C₁₀H₃₀O₅Si₅
Simplified Structure:
[-Si(CH₃)₂-O-]₅
D5 (Cyclic siloxane pentamer)
| Parameter | Description |
|---|---|
| Molecular Formula | C₁₀H₃₀O₅Si₅ |
| Molecular Weight | 370.77 g/mol |
| Structure | Cyclic (ring) structure of five siloxane units |
| Functional Groups | Si-O-Si (siloxane bonds), Si-CH₃ (methyl groups) |
| Ring Size | 5 silicon atoms (D5) |
| Volatility | Low to moderate volatility |
| SMILES | C[Si]1(C)OSi(C)OSi(C)OSi(C)OSi(C)O1 |
| InChI | InChI=1S/C10H30O5Si5/c1-16(2)11-17(3,4)13-19(7,8)14-18(5,6)12-16/h1-10H3 |
| InChI Key | XHUXWIYHPXJHEM-UHFFFAOYSA-N |
| PubChem CID | 10913 |
| FDA UNII | THU6NOK0OR |
| EINECS | 208-764-9 |
| HS Code | 3910.00 |
SECTION 3: PHYSICAL AND CHEMICAL PROPERTIES
| Property | Value | Test Method / Note |
|---|---|---|
| Appearance | Clear, colorless liquid | Visual |
| Odor | Slight characteristic | Olfactometric |
| Molecular Weight | 370.77 g/mol | Calculated |
| Density (25°C) | ~0.95 g/cm³ | ASTM D4052 |
| Density (20°C) | ~0.956 g/cm³ | - |
| Boiling Point | ~210 °C | ASTM D86 |
| Melting Point | -40 °C | DSC |
| Viscosity (25°C) | ~3.5-4.5 cSt | ASTM D445 |
| Viscosity (20°C) | ~4.5-5.5 cSt | - |
| Flash Point | ~77-83 °C | ASTM D93 |
| Refractive Index (n²⁰/D) | 1.396-1.398 | ASTM D1218 |
| Vapor Pressure (25°C) | ~0.13 mmHg | - |
| Surface Tension | ~17-18 mN/m | - |
| Dielectric Constant | ~2.7 | - |
| Water Solubility | Insoluble (<1 mg/L) | General Method |
| Oil Solubility | Soluble | General Method |
| Ethanol Solubility | Partially soluble | General Method |
| Log P (Octanol/Water) | ~5.1 (lipophilic) | Calculated |
| Volatility | Moderate (completely evaporates) | - |
| Spreadability | High | - |
| Thermal Stability | Stable up to 150°C | - |
SECTION 4: FUNCTIONAL PROPERTIES AND MECHANISM OF ACTION
| Property | Description |
|---|---|
| Emollient | Provides silky, smooth glide on skin and hair surfaces. Traps moisture without leaving a greasy feel on the skin. |
| Carrier | Due to its volatile nature, it carries active ingredients to the skin surface and evaporates, leaving active substances on the skin. |
| Film Former | Forms a thin, breathable film layer on the skin; supports skin barrier function. |
| Spreader | Ensures easy and homogeneous spreading of formulations on the skin. |
| Lightness and Shine | Adds shine and volume to hair without weighing it down; provides easy combability. |
| Volatile Carrier | Evaporates from the formulation due to high volatility, leaving a smooth film behind. |
| Antistatic | Reduces static electricity on hair and skin. |
SECTION 5: SILICONE GRADES COMPARISON
| Property | Cyclopentasiloxane (D5) | Dimethicone | Cyclohexasiloxane (D6) | Dimethiconol |
|---|---|---|---|---|
| Structure | Cyclic (ring) | Linear | Cyclic (ring) | Linear (hydroxyl-terminated) |
| CAS Number | 541-02-6 | 9006-65-9 | 540-97-6 | 31692-79-2 |
| Viscosity | Low (~4 cSt) | Variable (5-1M cSt) | Low (~6 cSt) | Variable |
| Volatility | High | Low (none) | Moderate | Low |
| Skin Feel | Silky, light | Greasy, slippery | Silky, light | Greasy, slippery |
| Spreadability | Excellent | Moderate | Excellent | Moderate |
| Use | Creams, lotions, sprays | Leave-in products, creams | Sprays, creams | Hair care, creams |
SECTION 6: APPLICATION AREAS
| Industry / Application | Function | Typical Concentration |
|---|---|---|
| Skin Care (Creams, Lotions) | Emollient, carrier, spreader | 1-15% |
| Skin Care (Sunscreens) | Spreader, film former, water resistance | 2-10% |
| Hair Care (Shampoos) | Emollient, antistatic, shine | 0.5-3% |
| Hair Care (Conditioners, Masks) | Emollient, shine, easy combing | 1-5% |
| Hair Care (Hair Sprays) | Carrier, shine, volatile | 1-10% |
| Makeup (Foundation, BB Cream) | Spreader, carrier, light feel | 2-10% |
| Makeup (Eye Makeup, Lipstick) | Emollient, shine, spreadability | 1-5% |
| Deodorant / Antiperspirant | Carrier, emollient | 1-5% |
| Personal Care (Wet Wipes) | Emollient, skin feel | 0.5-2% |
| Pharmaceutical (Topical Gels) | Carrier, emollient | 1-10% |
| Industrial (Coatings) | Spreader, film former | Variable |
SECTION 7: TYPICAL FORMULATION CONCENTRATIONS
| Application | Recommended Concentration | Notes |
|---|---|---|
| Face Creams | 2-8% | For light, silky feel |
| Body Lotions | 3-10% | For glide and spreadability |
| Sunscreens | 2-10% | For water resistance and spreadability |
| Shampoos | 0.5-2% | For shine and softness |
| Conditioners | 1-5% | For easy combing and shine |
| Foundation | 2-10% | For spreadability and light feel |
| Hair Sprays | 1-10% | As volatile carrier |
| Deodorant | 1-5% | Carrier and emollient |
| Oil-based Serums | 5-15% | For light oil feel |
| BB/CC Creams | 2-8% | For spreadability and film formation |
SECTION 8: FORMULATION GUIDELINES
| Parameter | Recommendation |
|---|---|
| Addition Method | Add to oil phase; do not add to water phase |
| Temperature | Stable up to 60°C; evaporation begins above 80°C |
| pH Range | Stable in pH 3.0 – 9.0 |
| Compatibility | Compatible with most oils, esters, emulsifiers, and organic ingredients |
| Incompatibility | Limited compatibility with anionic surfactants; emulsion breaking at high concentrations |
| Mixing | Low-speed mixing is sufficient; high shear not required |
| Evaporation | May evaporate at high temperatures or if left open for extended periods |
| Emulsion | In O/W (oil-water) emulsions, add to oil phase; in W/O (water-oil) systems, use in external phase |
| Synergy | Can be combined with other silicones (dimethicone, dimethiconol) |
| Viscosity | Suitable for low viscosity formulations; reduces formulation viscosity |
SECTION 9: QUALITY SPECIFICATIONS
| Parameter | Specification | Test Method |
|---|---|---|
| Appearance | Clear, colorless liquid | Visual |
| Odor | Slight characteristic | Olfactometric |
| Assay (GC) | ≥99.0% | GC |
| Density (25°C) | 0.945 – 0.955 g/cm³ | ASTM D4052 |
| Refractive Index (20°C) | 1.396 – 1.398 | ASTM D1218 |
| Viscosity (25°C) | 3.5 – 4.5 cSt | ASTM D445 |
| Flash Point | ≥77°C | ASTM D93 |
| Water Content | ≤0.1% | Karl Fischer |
| Acidity | ≤0.01 mg KOH/g | Titrimetric |
| Heavy Metals (Pb) | ≤5 ppm | ICP-MS |
| Total D4/D6 Content | ≤0.1% | GC |
| Siloxane Content | ≥99.0% | GC |
| Color (APHA) | ≤20 | ASTM D1209 |
| Microbiological Purity | TAMC ≤10² CFU/g; TYMC ≤10¹ CFU/g | USP <61> |
SECTION 10: SAFETY AND TOXICOLOGICAL PROFILE
| Parameter | Value / Description |
|---|---|
| GHS Classification | Generally not classified as hazardous substance |
| Signal Word | None (not hazardous) |
| Hazard Pictograms | None |
| Acute Oral Toxicity (LD50, Rat) | >5,000 mg/kg (very low toxicity) |
| Acute Dermal Toxicity (LD50, Rabbit) | >2,000 mg/kg (low toxicity) |
| Acute Inhalation Toxicity | Low risk (low vapor pressure) |
| Skin Irritation | Not irritant |
| Eye Irritation | Mild irritant (mechanical) |
| Skin Sensitization | Does not cause sensitization |
| Carcinogenicity | Not classified as carcinogenic |
| Mutagenicity | Not mutagenic |
| Reproductive Toxicity | No reproductive toxicity |
| Target Organs | Eyes (mechanical irritation) |
| DERMA | Considered safe for cosmetic use |
| CIR Assessment | Safe (up to 10%) |
| FDA Approval | GRAS (Food and drug applications) |
SECTION 11: GHS CLASSIFICATION AND LABELING
GHS Classification (in accordance with 1272/2008/EC):
| Hazard Class | Category | H-Statement |
|---|---|---|
| Generally not classified as hazardous substance | – | – |
| Eye Irritation | Category 2 (optional) | H319 |
Signal Word: None (Not classified as hazardous) or Warning (optional)
Hazard Pictograms: None (generally) or GHS07 (Exclamation mark)
NFPA 704 Hazard Classification:
| Health | Flammability | Reactivity | Special |
|---|---|---|---|
| 1 | 1 | 0 | - |
| (Minimal health hazard) | (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 |
| P337+P313 | If eye irritation persists: Get medical advice/attention |
| 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 | Vapor not expected. If respiratory discomfort occurs, move to fresh air. |
| Skin Contact | 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. Seek medical attention if irritation persists. |
| Ingestion | Rinse mouth with water. Do NOT induce vomiting. Seek medical attention. |
| Note | Symptomatic treatment is administered. No specific antidote available. |
SECTION 14: FIREFIGHTING MEASURES
| Parameter | Information |
|---|---|
| Fire Hazard | Combustible liquid (Flash Point: ~77°C) |
| Fire-Related Hazards | Thermal decomposition produces carbon oxides, silica dust |
| Suitable Extinguishing Media | Water mist, CO₂, dry chemical powder, foam |
| Unsuitable Extinguishing Media | Water jet (may spread burning liquid) |
| Special Protective Equipment | SCBA, full protective clothing |
| Special Precautions | Prevent firefighting water from entering water bodies |
SECTION 15: STORAGE AND SHELF LIFE
| Parameter | Information |
|---|---|
| Storage Conditions | Store in a cool (<25°C), dry, well-ventilated area; protect from direct sunlight. |
| Temperature Limits | 15-25°C (ideal); do not exceed 30°C |
| Light | Protect from light (photodegradation) |
| Container Requirements | Tightly closed, moisture-resistant containers |
| Shelf Life | 24-36 months (unopened original packaging) |
| Signs of Degradation | Darkening color, odor change, viscosity increase |
SECTION 16: PACKAGING OPTIONS
| Packaging Type | Quantity / Capacity | Material |
|---|---|---|
| HDPE Drum | 25 kg, 50 kg, 200 kg | HDPE |
| Metal Drum (Lined) | 200 kg | Lined steel |
| IBC Container | 500 kg, 1000 kg | HDPE |
| Glass Bottle | 1 L, 5 L, 10 L | Amber glass |
| Aluminum Foil Bag | 1 kg, 5 kg, 10 kg | Aluminum / PE |
SECTION 17: TRANSPORTATION INFORMATION
| Parameter | Information |
|---|---|
| UN Number | Not applicable (not classified as dangerous goods) |
| Hazard Class | Not applicable |
| ADR/RID | Not classified as dangerous goods |
| IMDG Code | Not marine pollutant |
| IATA (Air) | Not classified as dangerous goods |
| Transport Temperature | Ambient temperature |
SECTION 18: REGULATORY STATUS
| Region / Authority | Status |
|---|---|
| USA (FDA) | GRAS; Approved as cosmetic ingredient |
| European Union (EC) | Approved as cosmetic ingredient |
| Turkey | Approved as cosmetic ingredient |
| CIR (Cosmetic Ingredient Review) | Safe (up to 10%) |
| ECHA (REACH) | Registered substance |
| TSCA (USA) | Listed |
| California (Prop 65) | Not listed |
| Halal | Yes (synthetic) |
| Kosher | Yes (with certification) |
| Vegan | Yes (synthetic) |
SECTION 19: OTHER NAMES AND SYNONYMS
| Type | Name |
|---|---|
| Turkish Names | Siklopentasiloksan, D5, Dekametilsiklopentasiloksan |
| English Names | Cyclopentasiloxane, D5, Decamethylcyclopentasiloxane |
| INCI Name | Cyclopentasiloxane |
| Trade Marks | Dow Corning 245 Fluid, SF 1202, XIAMETER PMX-0245, KF-995 |
| CAS Number | 541-02-6 |
| EC Number | 208-764-9 |
| PubChem CID | 10913 |
| FDA UNII | THU6NOK0OR |
SECTION 20: CRITICAL WARNINGS AND BEST PRACTICES
CRITICAL WARNINGS:
Volatility: Cyclopentasiloxane is a volatile liquid. Leaving it open for extended periods causes evaporation.
Flammability: Flash point ~77°C; keep away from ignition sources.
Water Insolubility: Insoluble in water; requires emulsification in water-based formulations.
Environmental Concern: Due to its environmental persistence and bioaccumulation potential, some countries have restrictions (Norway, Sweden).
REACH Restrictions: The EU has some restrictions on D5 under REACH.
BEST PRACTICE RECOMMENDATIONS:
Concentration: Skin care: 2-10%; Hair care: 1-5%; Makeup: 2-10%.
Addition: Add to oil phase; do not add to water phase.
Temperature: Process at temperatures not exceeding 60°C.
Mixing: Low-speed mixing is sufficient; high shear not required.
Emulsion: Use in oil phase for O/W emulsions.
Storage: Store in cool, dry, dark place in tightly closed containers.
Regulations: Check D5 restrictions in the country where the product is sold.
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.