Heptamethyltrisiloxane

Basic Product Information

• Product Name: Heptamethyltrisiloxane
• Appearance: Colorless Transparent Liquid

TYPICAL PROPERTIES

Appearance	colorless transparent liquid
purity  (GC),%	>99
Molecular weight	222.5

Physical Properties

• Colorless, odorless transparent liquid with adjustable volatility (completely volatilizes within 3-8 minutes).

Chemical Properties

• Active Si-O-Si structure, ultra-low surface tension (18-20 mN/m), rapidly spreads to form film.
• Certified by COSMOS and ECOCERT organic standards, complies with FDA 21CFR §172.210 regulations.

Product Functions

• Skin Sensation Optimization:

Instantaneous volatilization without residue, delivering a “zero burden” refreshing experience

Enhances formula spreadability and reduces white streaks during application

• Efficacy Enhancement:

Promotes transdermal absorption of active ingredients (e.g., Vitamin C/Retinol)

Improves even dispersion of sunscreen agents and boosts SPF value

• Formula Stability:

Prevents emulsion separation and extends shelf life

Compatible with various emulsification systems (O/W, W/O, silicone-in-water)

Applications

• Skincare: Sunscreen, Serum, Primer
• Color Cosmetics: Foundation, Lipstick, Mascara
• Hair Care: Shampoo, Conditioner, Hair Oil
• Specialized Applications: Deodorant, Hair Removal Cream, Baby Care Products

Core Advantages

Advantage	Cosmetic Value	Testing Standards
Instant Refreshing Sensation	30% faster evaporation rate than D5	In Vitro Skin Model Test (ISO 16128)
Enhanced Delivery Efficiency	45% increase in active ingredient absorption rate	Franz Diffusion Cell Method (OECD 428)
Formulation Compatibility	Compatible with >95% of emulsification systems	Centrifugal Stability Test (4000rpm × 30min)
Safety & Mildness	Passed eye irritation test (Draize Method)	OECD 405

Market Value

Market Size & Growth Trends

• Global Market Overview

2023 Market Size: $150-180 million (8-10% of the silicone-based cosmetic raw material market)

Growth Rate: 6.5-8.5% CAGR from 2023 to 2030, projected to reach $250-300 million by 2030

• Key Drivers:

Surging demand for lightweight silicones in premium skincare

Rising popularity of anhydrous cosmetics

Shift toward fast-drying, high-efficiency home cleaning products

Technology Innovation Directions

• Green Transformation

Development of bio-based HMTS (40% reduction in carbon footprint)

Replacement of controversial ingredients:

Cyclic siloxanes (D4/D5)

Volatile Organic Compounds (VOCs)

• Functional Hybridization

Ceramide complexes (barrier repair enhancement)

Sustained-release fragrance encapsulation (3x longer fragrance retention)

• Process Innovation

Microemulsion technology (particle size <100nm)

Supercritical fluid processing (purity >99.9%)

Experimental Data & Case Studies

Application in Sunscreen Products

• Data:

SPF50+ formula with 3% additive: 22% SPF boost (COLIPA standard)

Water resistance: 91% SPF retention after 80-minute immersion (FDA 2011)

• Case Study:

A global sunscreen brand: Consumer satisfaction rate for “non-greasy feel” increased from 68% to 92%.

Anti-Aging Serum Formulation

• Data:

1% Retinol + 2% additive: 1.8x increase in transdermal delivery (HPLC analysis)

Irritation reduced by 37% (3D skin model test)

• Case Study:

A domestic skincare brand: Product repurchase rate rose by 55%, securing a TOP 3 category ranking.

Long-Wear Foundation

• Data:

2% additive: 40% improvement in 8-hour wearability (VISIA-CR analysis)

33% enhanced spreadability (texture analyzer)

• Case Study:

A luxury cosmetics line: Successfully replaced cyclopentasiloxane (D5) and obtained EU eco-certification.

Preparation Process, Core Technologies, and Precautions

Preparation Processes

• Raw Material Selection & Pretreatment

Primary Materials: Dimethyl dichlorosilane (Me₂SiCl₂), Hexamethyldisiloxane (MM)

Purification:

Molecular sieve dehydration (moisture ≤10ppm)

Distillation (purity ≥99.5%)

Catalyst Activation:

Acidic clay catalyst (specific surface area ≥200m²/g), activated at 350°C for 4 hours

• Hydrolysis & Condensation Reaction

Conditions:

Temperature: 25-30°C (±1°C control)

pH: 4.5-5.5 (acetic acid buffer system)

Molar ratio: Me₂SiCl₂ : MM : H₂O = 1 : 0.8 : 1.2

Process Features:

Staged feeding: MM added first, followed by slow Me₂SiCl₂ drip

Nitrogen protection (O₂ ≤50ppm)

Reaction time: 4-6 hours

• Distillation & Purification

Multi-column Continuous Distillation:

Initial column: 80-100°C/50mmHg (remove low-boiling impurities)

Main column: 120-125°C/10mmHg (collect HMTS fraction)

Final column: 130-135°C/5mmHg (purity ≥99.9%)

Key Controls:

≥50 theoretical plates

Reflux ratio 8:1

Yield ≥85%

Core Technologies

• Precision Molecular Structure Control

End-capping: Adjust molecular weight distribution via MM dosage (Mw/Mn ≤1.05)

Branching Suppression: Microreactor technology (residence time ≤30s)

Stereoselectivity: Chiral catalysts for isomer enrichment (ee ≥95%)

• Low-Impurity Production

Chloride Control:

Triple water washing (conductivity ≤5μS/cm)

Molecular sieve adsorption (Cl⁻ ≤1ppm)

Metal Ion Removal:

Chelating resin treatment (Fe³⁺ ≤0.1ppm

Nanofiltration (pore size ≤1nm)

• Functional Modification

Surface Energy Tuning:

Fluorination (contact angle ≥110°)

Hydroxylation (surface energy ≤20mN/m)

Compatibility Enhancement:

Polyether grafting (EO/PO=3:1)

Amino modification (primary amine ≥1.2mmol/g)

• Microemulsion Technology

Emulsion System:

Nonionic emulsifier (HLB 12-14)

Co-surfactant (C8-C10 alcohols)

Parameters:

High-pressure homogenization (≥1000bar)

Particle size control (D50 ≤50nm)

Stability (no phase separation after 3000rpm × 30min centrifugation)

Precautions

• Safe for pregnant women but recommended dosage ≤3%
• Storage: Light-sensitive; 24-month shelf life
• TiO₂ compatibility: Pre-dispersion required

Packaging & Ordering

Packaging: 200kg/1000kg plastic drums (customizable).