Electrically insulating filler for sheathed heaters.

摘要

This disclosure relates to an electrically insulating filler for sheathed heaters. The filler includes globular and nonglobular particles containing at least 95 wt.% MgO, and the percentage of globular particles being at least 5 wt.%. The globular magnesia includes at least one single magnesia or a combination of magnesias selected from groups of sintered magnesias and electro-fused magnesias.