Cosmetic-Grade Polydimethylsiloxane (PDMS / Dimethicone)
Silico® Cosmetic-Grade PDMS is a high-purity silicone fluid widely used in skincare, haircare, sun care, and color cosmetics due to its excellent emollient, slip, barrier, and film-forming properties. Available in a broad viscosity range—from very low-viscosity fluids (~50 cSt) to medium/high-viscosity oils (350 cSt, 500–1000 cSt).
Introduction
Silico® Cosmetic-Grade PDMS (INCI: Polydimethylsiloxane) is a linear, highly purified silicone oil specifically designed for topical personal care applications. It provides a smooth, non-greasy feel, reduces transepidermal water loss (TEWL) by forming a breathable, occlusive film, improves spreadability, and decreases tackiness in creams, lotions, makeup, and haircare products. Safety and typical usage rates are well-documented in CIR (Cosmetic Ingredient Review) and industry TDS references.
Typical Physical Properties
| Parameter | Typical Value / Range | Test Method / Notes |
|---|---|---|
| INCI Name | Polydimethylsiloxane | Cosmetic INCI standard |
| Product Form | Clear, colorless liquid | Visual inspection |
| Viscosity (25°C) | 50 → 100,000+ cSt; common: 50, 100, 350, 500, 1000 cSt | ASTM D445; choose grade per application |
| Density (25°C) | ≈0.96 – 0.98 g/cm³ | Typical PDMS range |
| Refractive Index (25°C) | ~1.402 – 1.406 | Characteristic of PDMS |
| Flash Point (Closed Cup) | >300°C | ASTM D93; high molecular weight silicone |
| Volatile Content / Loss on Drying | ≤0.2% | Weight-based QC method for low-VOC grade |
| Purity (PDMS Content) | ≥97–99% | USP / GC verification |
| Unsaturation (Vinyl) Content | <0.1% | FTIR, non-reactive grade |
| Heavy Metals (Pb, Cd, Hg, As) | ≤10 ppm | ICP-MS per spec |
| Microbial / Endotoxin | Non-sterile; endotoxin testing if needed | Sensitive applications only |
| Packaging | 1 kg bottle, 25 kg drum, 200 kg drum, 1000 kg IBC | Customizable |
| Shelf Life | 24 months sealed; store at 5–35 °C | Avoid direct sunlight |
Key Benefits for Personal Care Formulations:
Silky Skin Feel: Smooths skin surface, minimizes texture irregularities.
Moisture Barrier & Occlusion: Helps retain skin hydration without excess greasiness.
Hair Conditioning & Slip: Improves combing, reduces friction, adds shine.
Makeup Flow & Gloss Control: Enhances pigment dispersion, surface smoothness, and optical properties.
Wide Viscosity Selection: Low-viscosity PDMS for light emollient or volatile feel; high-viscosity for thick films and long-lasting barrier.
Typical Cosmetic Applications:
Creams, lotions, ointments (emollient & barrier agent)
Foundations, primers, lipsticks, color cosmetics (enhanced glide & smooth finish)
Sunscreens (spreadability & water resistance)
Conditioners, serums, styling products (shine, slip, anti-frizz)
Antiperspirant/deodorant bases and skin protectants (film-forming, non-irritating)
Regulatory & Safety Overview
Safety Review: CIR confirms PDMS is safe at current cosmetic use levels; aerosol inhalation should be monitored.
Pharmacopeia Reference: USP/USPNF defines dimethicone ranges and purity; cosmetic PDMS shares INCI but uses specific cosmetic testing.
Compliance: SDS, REACH registration, RoHS, and other regulatory support documents are available from Silico®.
Usage Guidance: Typical dosage 0.5–30% depending on product; higher in hair oils and serums, lower in leave-on skincare.
Formulation & Compatibility
Inert with most oils, esters, hydrocarbons; limited solubility in highly polar aqueous systems.
For water-based systems, use silicone emulsions or PEG-modified silicones.
High-viscosity PDMS: add under low shear, preheat if needed, always within thermal limits.
Storage, Handling & Shelf Life
Storage: Sealed, 5–35 °C, away from sunlight and strong oxidizers.
Handling: Use gloves and goggles; avoid inhalation of aerosols.
Shelf Life: 24 months sealed, depending on viscosity grade.
Procurement & Contact
For technical datasheets, CoA, ISO 10993 summary reports, or to request a product sample, please contact:
Silico® Technical Sales — info@silicorex.com
Visit: www.silicore.com
Please specify your intended cosmetic application and desired viscosity grade for accurate recommendations.
Frequently Asked Questions
A1. No. Dimethicone is considered non-comedogenic and forms a breathable film that protects without blocking pores.
A2. Choose low-viscosity grades for lightweight serums and lotions; higher viscosities for long-lasting or waterproof formulations.
A3. Yes. Silico® provides low-cyclic, REACH-compliant grades with reduced environmental impact and high biodegradability performance.
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