Core-sheath particle for use as a filler for feeder masses

The This invention relates to a core-shell particles for use as a filler for feeder masses for producing feeders comprising(A) a carrier core, of therange in size from 30 microns has up to 500 micronsandconsists of a material, the resistant up to a maximum temperature of 1400 ° C and contains no polystyrene,(B) a core encapsulating shell, consisting of or comprising(B1) Particles with a D50 value of the particle size of a maximum of 15 .mu.m, the resistant up to a temperature of at least 1500 ° are,as(B2) a binder which the particles bind each other and to the carrier core,said Core-shell particles up to a temperature of at least 1450 ° C is stable.