Synthetic, hydrophobic, amorphous silica, produced via flame hydrolysis.
White colloidal powder of high purity.
HDK® H21 is applied as a thickening and thixotropic agent in composites, coatings, adhesives and sealants, especially in vinylester, epoxy and polyurethane systems.
HDK® H21 is not suitable for pharmaceuticals, food and feed.
A good dispersion of HDK® H21 is a must to assure optimum performance.
More detailed information about the application and processing of HDK® H21 is available in our HDK-brochures and on the WACKER web site
HDK® H21is offered in following packaging:
- pallet with paper bags: 10 kg bags
- big bags: 170 kg (big bag on pallet)
The 'Best use before end' date of each batch is shown on the shipping label and the certificate of analysis.
HDK® H21should 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.