F-Grade vs P-Grade Silicon Carbide: The Standard Behind the Label

F-grade and P-grade silicon carbide share the same grit numbers but follow different FEPA standards with meaningfully different particle size tolerances. This article explains the technical distinctions, maps each grade to its correct application, and outlines what procurement teams should verify before accepting a supplier’s grade declaration.

What the SiC Purity Certificate Actually Tells You — and What It Doesn’t

A supplier certificate showing 98.5% SiC purity tells only part of the story — free carbon, polytype ratio, and trace metals below 100 ppm often go unreported yet directly drive refractory failures and sintering defects. This article explains what each analytical method actually measures, which critical parameters standard COAs omit, and what supplementary documentation to require before approving any SiC shipment.