D5 Cyclopentasiloxane
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D5 Cyclopentasiloxane

Decamethylcyclopentasiloxane

CAS: 541-02-6

D5 Cyclopentasiloxane is a volatile cyclic siloxane (cyclo-dimethicone) widely used in cosmetics, personal care formulations, and industrial defoaming applications. It provides excellent spreadability, non-greasy feel, and rapid evaporation. As a key raw material for silicone rubber production and high-performance release agents, D5 is registered with REACH and complies with FDA standards for cosmetic use.

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Technical Specifications

Chemical NameD5 Cyclopentasiloxane
CAS Number541-02-6
Molecular FormulaC₁₀H₃₀O₅Si₅
Molecular Weight384.82 g/mol
AppearanceColorless transparent liquid
Purity≥99.5%
Density (25°C)0.950-0.960 g/cm³
Refractive Index (25°C)1.393-1.397
Boiling Point210°C
Flash Point77°C
Viscosity (25°C)~4 mm²/s
Packing200kg drums, IBC 1000kg, or as requested

Applications

🧴 Cosmetics & Personal Care

Skin care, deodorant, hair care formulations. Provides silky smooth feel and non-greasy spreading properties.

🧪 Silicone Rubber Production

Key raw material and platinumm catalyst solvent in RTV-2 silicone rubber manufacturing processes.

🏭 Industrial Defoaming

Antifoaming agent for coatings, inks, adhesives, and industrial process fluids.

🛢️ Release Agents

High-performance release agent for molds in rubber, plastic, and composite manufacturing.

🏭 Textile & Leather

Fiber lubricant and finishing agent for textiles and leather treatment.

⚡ Electronics

Heat-resistant dielectric fluid and solvent for electronic component manufacturing.

Frequently Asked Questions

What is D5 cyclopentasiloxane?
D5 (Decamethylcyclopentasiloxane, CAS 541-02-6) is a cyclic silicone with 5 silicon-oxygen units. It is a colorless, odorless, volatile liquid that evaporates quickly without leaving residue, widely used as a carrier and emollient in cosmetics and personal care.
What is D5 used for in cosmetics and personal care?
D5 is used in hair care (conditioners, dry shampoos), skin care (serums, sunscreens, makeup) and deodorants. It provides a silky, non-greasy skin feel, improves spreadability of actives, reduces drying time and acts as a volatile carrier. Industrial uses include precision cleaning and defoaming.
Is D5 safe and regulatory compliant?
D5 from Moon Technology is cosmetic-grade (≥99% purity), FDA-listed for cosmetic use and REACH registered. Note: EU REACH restricts D5 above 0.1% in wash-off cosmetic products; it remains approved for leave-on products and industrial applications. Compliance documentation available on request.
What is the difference between D4, D5 and D6?
D4, D5 and D6 are cyclic siloxanes with 4, 5 and 6 silicon-oxygen units. D5 is preferred in cosmetics for its balanced volatility and skin feel. D6 evaporates more slowly; D4 is the most volatile and faces stricter EU restrictions. Moon Technology supplies both D5 (CAS 541-02-6) and D6.
How do you formulate D5 in hair or skin care?
Typical use level is 5-20% of the formulation. D5 is compatible with dimethicone, natural oils, esters and most cosmetic ingredients. Add at room temperature with gentle stirring. For anhydrous systems it can be the main carrier phase.
What is the price and MOQ of D5?
MOQ 800 kg (free 1 kg sample available); 200 kg drums or 1000 kg IBC. 24-hour quote response and worldwide shipping with full documentation.

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