CREATING TOMORROW’S SOLUTIONS
HDK
N20
Pyrogenic Silica
Synthetic, hydrophilic, amorphous silica, produced via flame hydrolysis. Standard product for industrial applications.
INCI Silica
Properties
White colloidal powder of high purity.
Technical data
Specification
Property Condition Value Method
BET surface – 175 – 225 m /g DIN ISO 9277 DIN 66132
Tamped density – approx. 40 g/l DIN EN ISO 787-11
pH – 3.8 – 4.3 DIN EN ISO 787-9
Sieve residue – < 0.03 % DIN EN ISO 787-18
Loss on drying - < 1.5 % DIN EN ISO 787-2
1
in 4% aqueous dispersion
2
acc. to Mocker > 40 m
3
ex works (2 h at 105 C)
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N20 | Most recent change: 28.06.2022 1/4
General Characteristics
Property Condition Value Method
Density 20 C approx. 2.2 g/cm DIN 51757
INCI name – Silica –
Loss of weight – < 2 % DIN EN ISO 3262-19
Refraction index - 1.46 -
SiO content - > 99.8 % DIN EN ISO 3262-19
Silanol group density – 2 SiOH/nm –
1
SiO
2
at 1000 C / 2h (based on the substance dried at 105 C for 2 h)
3
based on the substance heated at 1000 C for 2 h
These figures are only intended as a guide and should not be used in preparing specifications.
All the information provided is in accordance with the present state of our knowledge. Nonetheless, we disclaim any warranty or liability whatsoever and reserve the right, at any
time, to effect technical alterations. The information provided, as well as the product’s fitness for an intended application, should be checked by the buyer in preliminary trials.
Contractual terms and conditions always take precedence. This disclaimer of warranty and liability also applies particularly in foreign countries with respect to third parties’ rights.
Applications
Anti-Corrosive Coatings
Antifriction Agents & Lubricants
Architectural Coatings
Automotive Coatings
Can Coatings
Coil Coatings
Composites
Flexographic Printing
Gravure Printing
Industrial Coatings
Industrial Wood Coatings
Inkjet Paper
Make-up
Marine & Protective Coatings
Offset Printing
Oral Care
Personal Care
Powder Coatings
Rheology Control
Roof Coatings
Screen Printing
Skin Care
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Structural Bonding of Wind Turbines
Sunscreen
Wind Energy
Wood-to-Wood Bonding
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.
HDK
N20 is used as a reinforcing filler in elastomers, mainly silicone-elastomers.
HDK
N20 acts as a free flow additive in the production of technical powders.
HDK
N20 is not suitable for pharmaceuticals, food and feed.
A good dispersion of HDK
N20 is a must to assure optimum performance.
More detailed information about the application and processing ofHDK
N20 is available in our HDK-brochures and on the
WACKER web site.
Packaging and storage
Packaging
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
Storage
The ‘Best use before end’ date of each batch is shown on the shipping label and the certificate of analysis.
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.
Safety notes
Comprehensive instructions are given in the corresponding Material Safety Data Sheets. They are available on request from
WACKER subsidiaries or may be printed via the WACKER web site. During transportation and processing HDK
N20 may
cause electrostatic charges. Like other amorphous silicas HDK
N20 does not show either carcinogenic (IARC
classification, Volume 68, 1997) or mutagenic properties.
QR Code HDK
N20
HDK
N20 | Most recent change: 28.06.2022 3/4
For technical, quality or product safety questions, please contact:
Wacker Chemie AG, Hanns-Seidel-Platz 4, 81737 Munich, Germany
productinformation@wacker.com, www.wacker.com
The data presented in this medium are in accordance with the present state of our knowledge but do not absolve the user from carefully checking all supplies immediately on
receipt. We reserve the right to alter product constants within the scope of technical progress or new developments. The recommendations made in this medium should be
checked by preliminary trials because of conditions during processing over which we have no control, especially where other companies raw materials are also being used. The
information provided by us does not absolve the user from the obligation of investigating the possibility of infringement of third parties rights and, if necessary, clarifying the
position. Recommendations for use do not constitute a warranty, either express or implied, of the fitness or suitability of the product for a particular purpose.
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