- Chemical Name:Pyrogenic Silica
- CAS Number:112945-52-5
- Functions:Thickener, Thixotrope, Rheology Modifier
- Chemical Family:Silica
- Compatible Polymers & Resins:Epoxies (EP), Vinyl Esters, Polyurethanes (PU)
- Synonyms:Fumed Silica, Silica, Silicon Dioxide
HDK® H21 is a synthetic, hydrophobic, amorphous silica produced via flame hydrolysis. It is a white colloidal powder of high purity. HDK® H21 is used as a thickening and thixotropic agent in various applications such as composites, coatings, adhesives, and sealants, particularly in vinylester, epoxy, and polyurethane systems.