Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Tokuyama REOLOSIL DM-20S Hydrophobic Fumed Silica

Tokuyama REOLOSIL DM-20S is a hydrophobic fumed silica imported from Japan, surface-modified with dimethyldichlorosilane. It has medium-high specific surface area, strong thixotropic thickening and excellent reinforcement, designed for polar liquid systems and suitable for paints, inks and silicone rubber

Features Of Tokuyama REOLOSIL DM-20S Hydrophobic Fumed Silica

  1. Strong hydrophobicity & hydrolysis resistance – organically modified surface, moisture-proof and hydrolysis-resistant, prolong formula shelf life

  2. Medium-high specific surface area reinforcement – ultra-fine particle structure, effectively enhance mechanical strength of silicone rubber

  3. Strong thixotropic control – quickly form 3D network, prevent sagging and sedimentation, improve construction accuracy

  4. Ultra-high purity – extremely low metal ions, meet high-cleanliness requirements of LED and transparent rubber

  5. Multi-system compatibility – suitable for polar solvent systems, with flow aid and anti-caking functions, easy to process

Typical Applications Of Tokuyama REOLOSIL DM-20S Hydrophobic Fumed Silica

  1. Paints & coatings – thickening and anti-settling for polar systems, improve film flatness, weatherability and adhesion

  2. Printing inks – enhance thixotropy and pigment dispersion, improve printing clarity, color stability and printability

  3. Sealants & adhesives – thickening and reinforcement, improve bonding strength, waterproof performance and long-term stability

  4. LED & electronic materials – high purity for encapsulation, ensure insulation and electronic performance stability

  5. Silicone rubber & elastomers – efficient reinforcement, improve toughness, wear resistance and aging resistance

Specifications Of Tokuyama REOLOSIL DM-20S Hydrophobic Fumed Silica

Product TypeHydrophobic Fumed Silica
AppearanceFluffy white powder
SiO₂ Content≥99.8%
BET Surface Area160–200 m²/g
Carbon Content1.7%
pH Value (4% suspension)4.8
Moisture Content<0.5%
Bulk DensityApprox. 50 g/L


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