HDK® N20 is a synthetic, hydrophilic, amorphous silica produced through flame hydrolysis. It is a standard product widely used in various industrial applications. This white colloidal powder offers high purity and serves multiple purposes. One of the primary applications of HDK® N20 is as a thickening and thixotropic agent in organic systems such as unsaturated polyesters, coatings, printing inks, adhesives, and cosmetics. Additionally, it functions as a reinforcing filler in elastomers, particularly silicone elastomers.

INCI Name: Silica

Chemical Name: Pyrogenic Silica

CAS Number: 112945-52-5

Functions: Extender, Filler, Reinforcement, Rheology Modifier, Thickener, Thixotrope, Viscosity Modifier

Chemical Family: Silica

Synonyms: Fumed Silica, Silica, Silicon Dioxide

Technical Data Sheet

Knowde Enhanced TDS

Identification & Functionality

Chemical Family
Chemical Name
INCI Name
Composite Materials Functions
Cosmetic Ingredients Functions
Plastics & Elastomers Functions
CAS No.
112945-52-5, 60676-86-0
EC No.
231-545-4, 262-373-8, 310-060-2

Features & Benefits

Applications & Uses

Compatible Polymers & Resins
Compatible Substrates & Surfaces
Composites End Use
Oral Care Applications
Plastics & Elastomers End Uses
Sun Care Applications
Treatment Product Applications
Applications
     
  • Anti-Corrosive Coatings
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  • Antifriction Agents & Lubricants
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  • Architectural Coatings
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  • Automotive Coatings
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  • Can Coatings
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  • Coil Coatings
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  • Composites
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  • Flexographic Printing
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  • Gravure Printing
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  • Industrial Coatings
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  • Industrial Wood Coatings
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  • Inkjet Paper
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  • Make-up
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  • Marine & Protective Coatings
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  • Offset Printing
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  • Oral Care
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  • Personal Care
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  • Powder Coatings
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  • Rheology Control
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  • Roof Coatings
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  • Screen Printing
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  • Skin Care
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  • Structural Bonding of Wind Turbines
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  • Sunscreen
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  • Wind Energy
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  • Wood-to-Wood Bonding
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Application Details
     
  • HDK® N20 is applied as a thickening and thixotropic agent in many organic systems, e.g. in unsaturated polyesters, coatings, printing inks, adhesives, cosmetics and others.
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  • HDK® N20 is used as a reinforcing filler in elastomers, mainly silicone-elastomers.
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  • HDK® N20 acts as a free flow additive in the production of technical powders.
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  • HDK® N20 is not suitable for pharmaceuticals, food and feed. A good dispersion of HDK® N20 is a must to assure optimum performance.
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Properties

Color
Physical Form
Appearance
White colloidal powder
Typical Properties
ValueUnitsTest Method / Conditions
Density (at 20°C, SiO₂)approx. 2.2 g/cm³DIN 51757
Loss of Weight (at 1000°C, 2hours (based on the substance dried at 105 °C for 2 hours))max. 2 %DIN EN ISO 3262-19
Refraction Index1.46
Silanol Group Density2SiOH/nm²
SiO₂ Content (based on the substance heated at 1000°C for 2 hours)min. 99.8%DIN EN ISO 3262-19
Specifications
ValueUnitsTest Method / Conditions
BET Surface175 - 225 m²/gDIN ISO 9277 DIN 66132
Loss on Drying (at 105°C, 2 hours)max. 1.5 %DIN EN ISO 787-2
pH (in 4% aqueous dispersion)3.8 - 4.3DIN EN ISO 787-9
Sieve Residue (min. 40 µm)max. 0.03 %DIN EN ISO 787-18, Mocker Apparatus
Tamped Densityapprox. 40 g/lDIN EN ISO 787-11
Properties

White colloidal powder of high purity.

Regulatory & Compliance

Safety & Health

Safety Notes

HDK® N20 should be stored in the original packaging in dry storage areas. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons. Due to the high surface area HDK® adsorbs volatiles and should be protected from humidity and volatiles. If single bags are taken away from an original pallet, the remaining bags of this pallet must again be protected against humidity and volatiles.

Packaging & Availability

Country Availability
Packaging Type
Regional Availability
  • Africa
  • Asia
  • Europe
  • Latin America
  • North America
  • Oceania
Packaging Information

Pallet with paper bags: 5 kg bags.

Storage & Handling

Storage Information

HDK® N20 is offered in following packaging:

  • Pallet with paper bags: 10 kg bags
  • Big bags: 150 kg (big bags on pallets)
  • Silotruck: depending on size of truck, approx. 3.5 to 5 tons