⚗️ Overview: What Is Dimethylpolysiloxane Ester?
Dimethylpolysiloxane Ester is a next-generation ester-functionalized silicone antifoam additive, produced by grafting ester groups (–CH₂–COOCH₃) onto the siloxane backbone of polydimethylsiloxane. This molecular modification - represented by the structural formula CH₃–Si–O–[Si(CH₃)₂–O]ₙ–CH₂–COOCH₃ - fundamentally transforms the performance characteristics compared to standard PDMS, making it purpose-designed for lubricant and industrial applications where conventional silicone antifoams exhibit limited compatibility or insufficient persistence.
The key innovation is the introduction of polar ester functional groups into the otherwise non-polar siloxane chain. This creates a molecule with amphiphilic character - capable of dispersing efficiently in both hydrocarbon base oils and polar synthetic base fluids (esters, PAG). The result is dramatically improved compatibility with lubricant formulations, faster and more homogeneous dispersion at the foam interface, superior antifoam persistence over extended drain intervals, and reduced risk of the silicone settling or coalescing out of the oil phase.
💡 Sinolook is a professional China chemical export company supplying premium Dimethylpolysiloxane Ester to global lubricant formulators, personal care manufacturers, and industrial process operators. We offer competitive pricing, flexible MOQ, and complete technical and regulatory documentation for buyers worldwide.
Dimethylpolysiloxane Ester - Ester-Modified Siloxane Structure & Multi-Industry Applications
💡 Dimethylpolysiloxane Ester vs. Standard PDMS: Key Differences
The ester modification fundamentally upgrades performance in lubricant and polar system applications where standard PDMS is limited.
| Property | Dimethylpolysiloxane Ester | Standard PDMS |
|---|---|---|
| Compatibility with Mineral Base Oil | Excellent | Good |
| Compatibility with Ester / PAG Synthetic Oils | Excellent | Limited |
| Antifoam Persistence (Long Drain) | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| Dispersion Speed in Base Oil | Fast (amphiphilic) | Moderate |
| Settling / Phase Separation Risk | Very Low | Low to Moderate |
| Skin Feel / Emolliency (Personal Care) | Enhanced (ester slip) | Good |
| Treat Rate for Effective Antifoam | Lower (higher activity) | Standard |
✅ Dimethylpolysiloxane Ester is the preferred antifoam choice for synthetic lubricants, long-drain engine oils, ATF/CVTF, compressor oils, and premium personal care formulations where standard PDMS shows insufficient compatibility or persistence.
🔬 Technical Specifications
Standard parameters provided by Sinolook's verified China manufacturing partners. Custom ester content, viscosity grades, and concentrate formulations are available upon request.
| Parameter | Standard Value | Significance |
|---|---|---|
| Appearance | Colorless to pale yellow transparent liquid | Free of visible impurities or turbidity |
| Kinematic Viscosity @ 25°C | 100 – 10,000 cSt (grade-dependent) | Determines handling properties and dispersion behavior |
| Ester Content | 5 – 30 mol% (adjustable) | Controls polarity balance and base-oil compatibility |
| Silicon Content | 30 – 38% | Confirms siloxane backbone integrity |
| Density (25°C) | 0.970 – 1.000 g/cm³ | Slightly higher than standard PDMS due to ester groups |
| Flash Point (COC) | ≥ 250°C | Excellent fire safety for industrial use |
| Operating Temperature Range | -40°C to +180°C | Wide thermal window for engine and industrial use |
| Acid Value | ≤ 0.5 mg KOH/g | Low acidity prevents corrosion in lubricant systems |
| Shelf Life | 24 months (sealed, cool & dry storage) | Stable long-term performance |
✅ All specifications meet international lubricant additive quality standards. CoA, SDS/MSDS, and third-party inspection reports available upon request.
Dimethylpolysiloxane Ester - Product supplied by Sinolook, Xiamen, China
🏭 Key Application Fields
🛢️ 1. Lubricant Antifoam - Engine Oils, Synthetic Oils & ATF
Dimethylpolysiloxane Ester is the superior antifoam choice for modern synthetic and semi-synthetic lubricant formulations - including Group III/IV (PAO) engine oils, ester-based compressor oils, ATF/CVTF, and industrial gear oils where standard PDMS is incompatible or exhibits poor retention. Its ester-modified siloxane backbone ensures uniform, stable dispersion throughout the oil phase without coalescence or settling, providing persistent foam suppression at treat rates of 10–50 ppm across extended drain intervals of 15,000–30,000 km. It is fully compatible with all standard lubricant additive packages including ZDDP, antioxidants, dispersants, and detergents.
For automatic transmission fluids and CVT fluids, its enhanced polarity and lower settling tendency make it significantly more reliable than standard PDMS in maintaining consistent antifoam performance throughout the fluid's service life - a critical requirement for OEM ATF approvals.
🏗️ 2. Industrial Process Defoamer - High-Compatibility Applications
In industrial processes involving polar solvents, ester-based fluids, or aggressive surfactant systems where standard PDMS is destabilized or rapidly deactivated, Dimethylpolysiloxane Ester maintains its antifoam effectiveness. Applications include ester-based hydraulic fluids, biodegradable lubricants, metalworking fluids, textile finishing oils, and leather treatment chemicals. Its amphiphilic character enables effective dispersion in both the oil and aqueous phases of emulsified metalworking fluid systems, providing superior foam control compared to either hydrocarbon defoamers or standard PDMS alone. The ester modification also improves its performance in automotive paint and coatings processes, where it acts as both a defoamer and surface leveling agent.
💄 3. Premium Personal Care & Cosmetics
The ester-modified siloxane structure imparts a uniquely luxurious skin feel combining the lightweight, non-greasy characteristics of silicone with the emollient slip and skin-compatibility of ester oils. This makes Dimethylpolysiloxane Ester a highly valued ingredient in premium skincare creams, serums, foundations, sunscreens, hair conditioners, and leave-in treatments. It functions simultaneously as an antifoam agent, emollient, skin-conditioning agent, and surface film former, reducing formulation complexity while improving sensory performance. Its excellent compatibility with both aqueous and oil phases makes it particularly valuable in O/W and W/O emulsion formulations.
🔧 4. Automotive & Industrial Surface Treatment
In automotive care products, plastic and rubber surface treatments, and industrial release agents, Dimethylpolysiloxane Ester provides superior adhesion to polar substrates compared to standard PDMS - due to its ester groups interacting with the surface. It delivers durable water repellency, UV protection, and high-gloss surface conditioning on painted, plastic, and leather automotive surfaces. In industrial mold release applications, the ester functionality improves adhesion to metal mold surfaces while maintaining the non-stick character needed for clean part release from rubber and plastic molds.
📦 Storage & Handling Guidelines
🏪 Storage Conditions
- Cool, dry, well-ventilated warehouse; away from direct sunlight, heat sources & open flames
- Recommended storage temperature: 5°C – 30°C; avoid prolonged exposure above 40°C to prevent ester hydrolysis
- Use sealed HDPE drums or metal containers; keep moisture out - ester groups are susceptible to hydrolysis in prolonged contact with water
- Keep away from strong acids, alkalis, and oxidizing agents which may catalyze ester hydrolysis
- Maximum stacking height: 3 layers to prevent drum deformation and leakage
⚠️ Handling Precautions
- Wear chemical-resistant gloves, safety goggles & protective clothing as standard practice
- Avoid prolonged skin contact; rinse with water if contact occurs - the product has low acute toxicity but ester groups may cause mild irritation
- For personal care grade: use dedicated clean equipment to avoid cross-contamination from industrial grades
- Spills: absorb with dry inert material (sand, vermiculite); collect and dispose per local environmental regulations
- Flash point ≥ 250°C - not classified as flammable under normal handling conditions
🌐 How to Choose a Reliable China Supplier
Dimethylpolysiloxane Ester is a specialty modified silicone - manufacturing consistency, ester content accuracy, and application-specific customization are far more critical than for standard PDMS. Evaluate suppliers across these dimensions:
Precise control over ester content (mol%) and ester group distribution along the siloxane chain is critical - inconsistent esterification leads to variable base-oil compatibility and antifoam persistence.
ISO 9001 for industrial grades; additional ISO 22716 (GMP) certification for personal care grades. REACH registration documentation required for EU buyers.
Unlike commodity PDMS, ester-modified grades often need tailoring to specific base oil types and applications. Suppliers capable of adjusting ester content, chain length, and viscosity on request are preferred.
Insist on suppliers who can provide formulation compatibility testing data, treat rate recommendations for your specific base oil, and practical guidance on incorporation into your manufacturing process.
Dimethylpolysiloxane Ester is a value-added specialty product - pricing should reflect ester content and viscosity. China manufacturers offer competitive pricing with stable supply due to their integrated silicone monomer production infrastructure.
Always evaluate Dimethylpolysiloxane Ester in your specific base oil system before committing to bulk quantities - the optimal ester content and treat rate depend on the polarity and additive package of your finished lubricant. Start at 20–50 ppm for lubricant antifoam applications and adjust based on foam bench test results (ASTM D892). For personal care applications, incorporate at 0.5–5% in the oil phase and ensure thorough homogenization before emulsification. Request a free sample and our technical application guide to accelerate your formulation development.
❓ Frequently Asked Questions (FAQ)
Q1: What makes Dimethylpolysiloxane Ester different from standard PDMS?
Standard PDMS is a purely non-polar siloxane polymer that can show limited compatibility and tendency to settle in polar or ester-based lubricants and formulations. Dimethylpolysiloxane Ester is a chemically modified PDMS where ester groups (–CH₂–COOCH₃) are grafted onto the siloxane backbone. This gives the molecule amphiphilic character - it disperses efficiently in both non-polar hydrocarbons and polar ester/PAG synthetic oils - resulting in better antifoam persistence, reduced settling risk, and broader formulation compatibility.
Q2: Is Dimethylpolysiloxane Ester suitable for use in fully synthetic PAO engine oils?
Yes - this is one of its primary advantages over standard PDMS. In high-PAO content fully synthetic engine oils (Group IV base oil blends), standard PDMS can phase-separate or show reduced antifoam persistence. The ester modification significantly improves compatibility and retention in PAO-based systems, making Dimethylpolysiloxane Ester the recommended antifoam choice for 0W-16, 0W-20, and 0W-30 fully synthetic engine oils formulated with Group IV base oils.
Q3: Can Dimethylpolysiloxane Ester be used in personal care and cosmetic formulations?
Yes. Low-viscosity Dimethylpolysiloxane Ester grades are used in premium skincare, hair care, foundations, and sunscreens where they provide enhanced emolliency, surface gloss, and spreadability compared to standard PDMS or dimethicone. They are compatible with common cosmetic emulsifiers and active ingredients. For regulated markets (EU, USA), please confirm with us regarding available INCI documentation and safety dossier support for your specific grade.
Q4: What is the recommended treat rate for lubricant antifoam applications?
For lubricant antifoam use, typical treat rates are 10–100 ppm in the finished oil. The optimal rate depends on base oil type, additive package, and severity of the foam challenge. We recommend bench-scale ASTM D892 foam testing to optimize treat rate before scale-up - our technical team can assist with test protocol guidance and interpretation of results.
Q5: What documentation is provided with each shipment?
Every shipment from Sinolook includes: Certificate of Analysis (CoA), Safety Data Sheet (SDS/MSDS), commercial invoice, packing list, Bill of Lading, and Certificate of Origin. Third-party inspection reports (SGS, Intertek, BV) and REACH compliance documentation are available upon request. For personal care grades, INCI name documentation and safety assessment support are available.
📩 Contact Sinolook – Your Trusted Partner for Dimethylpolysiloxane Ester
Sinolook is a professional chemical export company connecting global buyers with China's leading specialty silicone manufacturers. Our Dimethylpolysiloxane Ester products - available in multiple viscosity grades and ester content levels for lubricant, industrial, and personal care applications - meet rigorous international quality standards. We provide complete one-stop procurement support: grade matching, technical consultation, quality inspection, customs documentation, and international logistics.
| 📧 | sales@sinolookchem.com | |
| 📱 | +86 181 5036 2095 | |
| 💬 | WeChat / Tel | +86 134 0071 5622 |
| 🌐 | Website | www.sinolookchem.com |
| 🏢 | Address | 38th Floor, Zhongmin Building, No. 72 North Hubin Road, Siming District, Xiamen, Fujian, China |
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