Wacker HDK® H18 Silica

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Wacker HDK® H18 Silica
Categories:	Ceramic; Oxide; Silicon Oxide; Other Engineering Material; Additive/Filler for Polymer
Material Notes:	Synthetic, hydrophobic, amorphous silica, produced via flame hydrolysis. Special features: White colloidal powder of high purity. Application: HDK® H18 is applied as a thickening and thixotropic agent in composites, coatings, adhesives and sealants, especially in vinyl ester, epoxy and polyurethane systems. Information provided by Wacker Chemie AG.
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Physical Properties	Metric	English	Comments

Bulk Density	0.0500 g/cc	0.00181 lb/in³	tamped; DIN EN ISO 787-11
Density	2.20 g/cc	0.0795 lb/in³	DIN 51757
pH	4.0 - 6.8	4.0 - 6.8	4% dispersion; DIN EN ISO 787-9
Specific Surface Area	120 m²/g	120 m²/g	Hydrophobic Silica
	170 - 230 m²/g	170 - 230 m²/g	Hydrophobic Silica
Evaporation Loss	<= 0.60 % @Temperature 105 °C, Time 7200 sec	<= 0.60 % @Temperature 221 °F, Time 2.00 hour	DIN EN ISO 787-2

Component Elements Properties	Metric	English	Comments
Carbon, C	4.0 - 5.2 %	4.0 - 5.2 %	DIN ISO 10694
SiO2	>= 99.8 %	>= 99.8 %	based on the substance heated at 1000°C for 2 h; DIN EN ISO 3262-19

Descriptive Properties
Content (%)	25		Residual silanol
Sieve residue	<0.3%		acc to Mocker >40 µm, DIN EN ISO 787-18

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PWACK9343 / 204872

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