What Is Phenyl Trimethicone and Why Is It Widely Used in Cosmetics and Personal Care?
Technical Introduction
Phenyl Trimethicone is a silicone-based polymer derived from trimethylsiloxy-terminated phenylmethylsiloxane. It belongs to the family of organosilicon compounds designed for cosmetic and industrial use.
Unlike conventional dimethicones, Phenyl Trimethicone has phenyl functional groups attached to the siloxane backbone, which significantly improve:
Refractive index (RI) – enhancing gloss and shine.
Compatibility – with organic oils and cosmetic esters.
Film-forming ability – creating long-lasting protective layers on hair or skin.
It is an inert, non-volatile, water-insoluble silicone oil with excellent spreadability and low surface tension, making it valuable in formulations that demand smooth feel, gloss, and moisture resistance.
Applications
Hair Care Products
Provides gloss, softness, and anti-frizz effect in shampoos, conditioners, serums, and styling sprays.
Enhances thermal protection against blow-drying and flat ironing.
Improves hair detangling and combability.
Skin Care Products
Used in creams, lotions, and sunscreens to impart silky smooth feel.
Forms a breathable film that reduces transepidermal water loss (TEWL).
Enhances spreadability of formulations and improves UV filter dispersion.
Color Cosmetics (Makeup)
Adds gloss and adhesion in lipsticks, foundations, pressed powders, and mascaras.
Provides long-lasting wear without greasy residue.
Sunscreens
Improves dispersion of inorganic filters (TiO₂, ZnO).
Enhances water resistance of sun care formulations.
Industrial Applications
Used as a release agent, gloss additive, and lubricant in specialty coatings.
Advantages
High Refractive Index (1.46–1.48): Gives strong shine and gloss to hair and skin.
Excellent Compatibility: Mixes well with esters, hydrocarbons, and natural oils.
Non-Greasy & Lightweight: Leaves a smooth, dry touch after application.
Film-Forming & Protective: Creates a thin protective layer without clogging pores.
Water & Moisture Resistance: Improves formulation durability and humidity resistance.
Heat Protection: Protects hair fibers from thermal damage during styling.
Versatility: Used across hair care, skin care, sun care, and makeup.
Specifications (Typical Parameters)
| Parameter | Description | Typical Value |
|---|---|---|
| INCI Name | Phenyl Trimethicone | — |
| CAS Number | 63148-52-7 (general siloxane range) | — |
| Appearance | Clear, colorless to pale yellow liquid | — |
| Viscosity (25°C) | Flow properties | 30 – 350 cSt (depending on grade) |
| Refractive Index (25°C) | Optical property | 1.46 – 1.48 |
| Specific Gravity | 0.97 – 0.99 | |
| Solubility | In water | Insoluble |
| Solubility | In cosmetic esters, oils, alcohols | Good |
| Stability | Oxidative and thermal stability | High |
FAQ
Q1: What is Phenyl Trimethicone mainly used for?
A: It is primarily used in cosmetics and personal care for hair shine, skin smoothness, and long-lasting makeup.
Q2: How does it differ from Dimethicone?
A: Unlike dimethicone, Phenyl Trimethicone contains phenyl groups, giving it higher refractive index and better compatibility with organic oils.
Q3: Is Phenyl Trimethicone safe for skin?
A: Yes, it is considered non-toxic, non-irritating, and non-comedogenic, making it safe for cosmetic use.
Q4: Does it make products greasy?
A: No, it leaves a silky, dry-touch finish without oiliness.
Q5: Can it be used in sunscreens?
A: Yes, it enhances water resistance, spreadability, and UV filter performance in sun care formulations.
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