Wacker HDK® N20ST Silica

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Wacker HDK® N20ST Silica
Categories:	Ceramic; Oxide; Silicon Oxide; Other Engineering Material; Additive/Filler for Polymer
Material Notes:	Synthetic, hydrophilic, amorphous silica, produced via flame hydrolysis. Standard product for industrial applications. Special features: White colloidal powder of high purity. Application: HDK® N20ST 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® N20ST shows a lower thickening activity compared to HDK® N20. Information provided by Wacker Chemie AG.
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Physical Properties	Metric	English	Comments

Bulk Density	0.0400 g/cc	0.00145 lb/in³	tamped; DIN EN ISO 787-11
Density	2.20 g/cc	0.0795 lb/in³	DIN 51757
pH	3.8 - 4.3	3.8 - 4.3	4% dispersion; DIN EN ISO 787-9
Specific Surface Area	175 - 225 m²/g	175 - 225 m²/g	Hydrophobic Silica
Evaporation Loss	<= 1.5 % @Temperature 105 °C, Time 7200 sec	<= 1.5 % @Temperature 221 °F, Time 2.00 hour	DIN EN ISO 787-2

Optical Properties	Metric	English	Comments
Refractive Index	1.46	1.46

Component Elements Properties	Metric	English	Comments
SiO2	>= 99.8 %	>= 99.8 %	based on the substance heated at 1000°C for 2 h; DIN EN ISO 3262-19

Descriptive Properties
Sieve residue	<0.03%		acc to Mocker >40 µm, DIN EN ISO 787-18

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PWACK9352 / 204881

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