Introduction to the IOTA Hydrophobic Fumed Silica Series — Precisely Tailored Performance to Meet Diverse Application Needs-Iota

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News > Dynamic industry > Introduction to the IOTA Hydrophobic Fumed Silica Series — Precisely Tailored Performance to Meet Diverse Application Needs

Introduction to the IOTA Hydrophobic Fumed Silica Series — Precisely Tailored Performance to Meet Diverse Application Needs

The IOTA Hydrophobic Fumed Silica series is based on hydrophilic fumed silica that is treated with different surface modification technologies (such as PDMS, HMDS, DDS) to impart differentiated properties. These products are widely used in silicone rubber, coatings, adhesives, and electronic materials. Below is an overview of the features and application guidance for four flagship products:
https://www.youtube.com/shorts/RGhQSKKjRUE
https://www.tiktok.com/@iotasiliconeoil/video/7506039782967889195?lang=zh-Hans

IOTA HB4139: Versatile Hydrophobic Fumed Silica

Technical Highlights

Specific surface area: 110±30 m²/g (low surface area design for balanced dispersibility and functionality)
Carbon content: 4.0–7.0% (high hydrophobicity via PDMS treatment)
pH: 4.0–7.0 (mildly acidic, suitable for sensitive systems)

Key Advantages

High loading reinforcement: Excellent mechanical properties even at high filler content, with no structure formation in silicone rubber
Compatibility with transparent systems: Low light scattering due to low surface area, ideal for optical-grade silicones and coatings
Rheology control: Strong thickening and thixotropy effects; prevents settling and sagging, improves flow in toner coatings

Recommended Applications
Silicone rubber products, transparent coatings/inks, high-load lubricants, powder coatings

IOTA HB4620: Specialized Reinforcement for Heat-Cured Silicone Rubber

Technical Highlights

Specific surface area: 170±30 m²/g (high surface activity via deep HMDS treatment)
Carbon content: 1.5–2.5% (moderate hydrophobicity for balanced processability and thermal resistance)
Loss on ignition: ≤4.0% (low volatiles, excellent thermal stability)

Key Advantages

Anti-structuring technology: Prevents hardening during storage of HTV/LSR silicone rubbers
Thixotropic stability: Prevents settling and sagging in coatings/inks; precise rheology control in adhesives
High purity: ≥99.8% SiO₂ content minimizes impact of impurities on electrical performance

Recommended Applications
Heat-cured silicone rubber products, high-temperature coatings, industrial adhesives, anti-caking agent in powder coatings

IOTA HB4152: Preferred Choice for RTV Silicone and Electronic Materials

Technical Highlights

Specific surface area: 170±30 m²/g (high surface activity via DDS treatment)
Carbon content: 0.8–1.6% (ultra-low hydroxyl content, exceptional hydrophobicity)
Loss on ignition: ≤2.5% (very low volatiles, extends shelf life of electronic encapsulants)

Key Advantages

Long-lasting thixotropy: Effective in both one- and two-component RTV silicone systems
Electronic-grade compatibility: Low ion content meets strict requirements for LED packaging and electronic encapsulation
Moisture resistance and anti-caking: Enhances free-flowing properties in powder coatings by over 30%

Recommended Applications
Electronic encapsulants, RTV silicone rubber, high-transparency coatings, precision powder coatings

IOTA HB4132: Specialist for Transparent Systems and High Loadings

Technical Highlights

Specific surface area: 140±20 m²/g (moderate surface area, deep HMDS treatment)
Carbon content: 2.0–4.0% (balanced hydrophobicity and dispersibility)
Thickening control: Extremely low thickening effect, maintains low viscosity at high filler loadings

Key Advantages

Transparent system compatibility: No blue light effect, ideal for optical-grade silicones and clear adhesives
Self-leveling performance: Enables smooth surfaces in RTV-1K/RTV-2K silicone systems
Multi-functional use: Serves as a carrier for defoamers and dispersant for colorants, enhancing formulation compatibility

Recommended Applications
Self-leveling silicone, transparent adhesives, premium defoamers, digital printing colorant dispersants

Selection Guide

For high loading and reinforcement: HB4139 (for silicone) / HB4132 (for transparent systems)
For heat-cured silicone rubber: HB4620 (anti-structuring)
For electronics and RTV systems: HB4152 (ultra-low volatiles)
For rheology control in coatings and inks: HB4620 (anti-settling) / HB4152 (high transparency)

The IOTA Hydrophobic Fumed Silica series, with its precision surface treatments and strict quality control, delivers customized solutions for complex formulations, supporting breakthrough performance in end products.

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