Dimethiconol (Silanol Moisturizing Silicone)-CAS 70131-67-6
Product Name: Dimethiconol (Silanol Moisturizing Silicone)
INCI Name: Dimethiconol
Alias: Polydimethylsiloxanol, Silanol-Modified Dimethicone, Hydroxyl-Terminated Silicone, Skin Barrier Repair Silicone, Ultra-Smooth Cosmetic Emollient, Breathable Lock-Water Conditioner
CAS No.: 70131-67-6
Appearance: Colorless, transparent and odorless viscous liquid
Grade: Cosmetic Premium Grade
MOQ (Minimum Order Quantity): 25KG
Solubility: Insoluble in water, uniformly dispersible in oil-phase systems, fully compatible with all cosmetic greases, esters, waxes and oil-soluble active ingredients. It can be stably compounded with non-ionic, anionic and amphoteric emulsifier systems without demulsification, flocculation or precipitation, with extremely wide formula adaptability.
Storage Condition: Sealed and stored in dry, cool and ventilated warehouse, storage temperature 5–30℃, avoid high temperature, freezing, strong light exposure and damp polluted environment. Keep tightly sealed after opening to prevent dust and moisture contamination and ensure stable skin feel and moisturizing barrier performance.
Shelf Life: 24 Months
Dimethiconol, Silanol Modified Silicone, Skin Barrier Repair Agent, Super Smooth Emollient, Breathable Moisturizing Silicone, Non-Greasy Skin Conditioner, Sensitive Skin Friendly Silicone, Makeup Smoothing Primer Raw Material
Dimethiconol (Silanol Moisturizing Silicone)-CAS 70131-67-6
Dimethiconol is an upgraded silanol-modified silicone material for high-end cosmetic texture and barrier care. Compared with ordinary dimethicone, its terminal hydroxyl active groups greatly enhance skin affinity and film permeability.
It can form a flexible, breathable and invisible protective film on the skin surface, which can effectively lock moisture without blocking skin respiration, perfectly solving the dilemma of "traditional silicone moisturizing but stuffy skin".
It has excellent lubricating and smoothing properties, which can significantly improve the ductility and delicate touch of skin care and makeup products, eliminate sticky and heavy texture, and bring velvet-like silky skin feel.
In addition, the physical barrier formed by dimethiconol can isolate external dust, pollutants and mild irritants, assist in repairing damaged skin barriers, relieve dry and sensitive discomfort, and is an irreplaceable multi-functional texture moisturizing and soothing raw material in high-grade cosmetic formulas.



Key Benefits
• Breathable Lock-Water, Long-Lasting Moisturizing: Unique semi-occlusive breathable film structure effectively reduces skin transepidermal water loss, continuously replenishes and locks skin moisture, relieves dryness, peeling and tightness. Unlike traditional airtight silicone oil, it avoids stuffy skin and greasy residue, keeping skin hydrated and fresh all day long.
• Silanol Active Skin Affinity, Barrier Repair: Terminal silanol active groups fit closely with skin keratin, enhance skin adhesion, form a flexible protective barrier, isolate external irritants and pollution, assist in repairing fragile and damaged skin barriers, reduce redness and dry sensitivity, and are friendly to sensitive and muscle-sensitive skin.
• Ultra-Smooth Velvet Skin Feel, Optimize Texture: Excellent lubricating and leveling performance, significantly improve product spreadability, make skin care products easy to push and absorb, and makeup products fit more smoothly. It blurs pores and fine lines, eliminates powder floating and dry lines, and creates delicate and uniform skin texture.
• Light & Non-Greasy, No Stuffy Skin & Acne: Low-residue lightweight formula, no heavy oil film feeling on the skin surface after use, refreshing and non-sticky. The breathable structure will not block pores, effectively avoid stuffy acne and closed mouth problems caused by traditional silicone, and is suitable for oily and mixed skin.
• Stable Formula & Wide Compatibility: Excellent compatibility with various greases, esters, emulsifiers and active ingredients, stable compounding without floating oil, demulsification or stratification. It can stabilize product system, improve formula ductility, and enhance product texture grade and use experience.
• Mild & Safe, High Standard Compliance: High-purity cosmetic grade, no harmful additives, no residual impurities, low irritation and high safety. Fully compliant with global cosmetic safety regulations, suitable for high-end clean beauty, sensitive skin and pregnant skin mild formulas.
Applications
• Barrier Repair Skincare Series: Core moisturizing and repairing raw materials for sensitive skin repair cream, barrier lotion, postoperative repair skin care and dry skin nourishing cream. It locks water and soothes sensitivity, repairs damaged barriers, and improves dry and rough skin texture.
• High-Grade Smooth Base Makeup: Exclusive texture modifier for makeup primer, silky foundation, tinted moisturizer and concealer. It optimizes product spreadability, blurs pores and fine lines, improves makeup fitting degree, and solves card powder and dry line problems.
• Sunscreen & Isolation Products: Used in physical sunscreen, isolation cream and outdoor protective skin care products. It improves the smoothness and uniformity of sunscreen coating, avoids whitening and fake slippery, and enhances skin protective effect.
• Daily Moisturizing Skin Care: Widely added in moisturizing milk, nourishing face cream, essence lotion and body lotion. It long-lastingly locks skin moisture, improves dry and tight skin, and makes skin delicate and elastic.
• Hair & Body Care Products: Suitable for hair conditioner, hair mask, body milk and hand cream. It lubricates hair and skin surface, eliminates dry and frizzy hair, brings silky smooth touch, and improves product use grade.
• Clean & Sensitive Skin Beauty: Preferred mild silicone raw material for zero-addition clean beauty, sensitive skin exclusive skin care and pregnant women’s skin care products, balancing moisturizing effect and skin-friendly safety.
Certificate Of Analysis (COA)
Test Item | Standard Specification | Test Result |
Product Name | Dimethiconol | Compliant |
Appearance | Colorless Transparent Viscous Liquid, Odorless, No Impurities | Compliant |
Viscosity (mPa·s, 25℃) | 400–1200 | 750 |
Refractive Index | 1.400–1.410 | 1.405 |
Specific Gravity (25℃) | 0.960–0.980 | 0.972 |
Volatile Matter (%) | ≤1.0 | 0.45 |
Water Locking Performance | Excellent Breathable Moisturizing, No Stuffy Skin | Qualified |
Skin Feel Performance | Super Smooth, Non-Greasy & Non-Sticky | Qualified |
Compatibility | Stable Compounding, No Floating Oil & Delamination | Qualified |
Heavy Metal (Pb) | ≤1ppm | 0.1ppm |
Arsenic (As) | ≤0.5ppm | Not Detected |
Mercury (Hg) | ≤0.1ppm | Not Detected |
Cadmium (Cd) | ≤0.1ppm | Not Detected |
Total Bacteria | ≤100CFU/g | Qualified |
Pathogenic Bacteria | Negative | Negative |
Conclusion | Conforms to cosmetic grade quality standard | Qualified |
Frequently Asked Questions (FAQ)
• Q1: What is the MOQ of Dimethiconol?
A1: The standard MOQ is 25KG, support sample orders for formula testing and trial production, and support customized viscosity specifications for mass production.
• Q2: What is the core advantage compared with ordinary dimethicone?
A2: Ordinary dimethicone forms dense airtight film, which is easy to cause stuffy skin and greasy residue. Dimethiconol contains active silanol groups, with higher skin affinity and breathable film-forming property. It realizes moisturizing without stuffy skin, and has additional barrier repair and soothing effects, which is an upgraded version of traditional silicone oil.
• Q3: What is the recommended dosage in cosmetic formulas?
A3: Barrier repair skin care: 1.5%–4.0%; Primer & foundation: 0.8%–3.0%; Sunscreen & isolation: 1.0%–3.5%; Daily moisturizing lotion/cream: 0.5%–2.5%; Hair care products: 0.3%–1.5%, adjustable according to target skin feel and moisturizing requirements.
• Q4: Is dimethiconol suitable for sensitive and oily skin formulas?
A4: Yes. It is mild and non-irritating, with breathable and non-occlusive film-forming characteristics. It will not block pores or cause acne and closed mouth problems. It can soothe sensitive discomfort and balance oily skin texture, perfectly suitable for sensitive skin and oily skin care formulas.
• Q5: What formula systems is this product suitable for?
A5: It is suitable for all oil-phase and emulsion cosmetic systems, including skin care cream/lotion, base makeup, sunscreen, hair care and body care products. It has ultra-high compatibility with various greases and emulsifiers, stable formula and no adverse reactions.
• Q6: What are the formula usage notes?
A6: It is recommended to add and stir evenly in the oil phase at 40–60℃; avoid long-term high-temperature heating above 80℃ to prevent molecular performance attenuation; it can be compounded with most silicone and non-silicone emollients for better skin feel.
• Q7: Can it provide stable supply and professional technical support?
A7: Strictly control core indicators such as viscosity, volatile content, skin feel and moisturizing performance to ensure consistent batch stability. Support long-term bulk order supply and provide one-stop professional services including formula debugging, dosage optimization and after-sales technical guidance.
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