HDK H21 hydrophobic pyrogenic silica. HDK H21 is applied as a thickening and thixotropic agent in coatings, adhesives and sealants, especially in epoxy and polyurethane systems.
HDK H21
By: Wacker
Technical Description of HDK H21
Chemical/Common Name:
Synthetic, hydrophobic, amorphous silica, produced via flame hydrolysis.