Patent ID: 8450229

Claim:
A mix, comprising a) at least one very finely divided, aggregated, pyrogenic silicon dioxide powder having an average particle diameter of from 2 to 100 nm and a BET surface area of at least 30 m 2 /g, wherein the very finely divided, aggregated, pyrogenic silicon dioxide powder is in the form of an organic dispersion having a silicon dioxide content of at least 15 wt %, b) magnesium oxide having an average particle diameter of from >0.5 μm to 30 mm, c) at least one synthetic resin as binder, and d) at least one metallic antioxidant having an average particle diameter of from >0.5 to 250 μm; wherein the at least one very finely divided, aggregated, pyrogenic silicon dioxide powder is present in the mix in an amount of from 0.01 to 5 percent by mass, based on the magnesium oxide.