Talc powder for rubber is a finely ground hydrated magnesium silicate. Compounders use it in selected formulations as a mineral filler, and in other forms as a dusting or anti-blocking agent. Whether it suits a compound depends on the rubber type, the grade’s particle size and shape, the dosage and the processing method. No single grade works everywhere. The right choice comes from reviewing technical data and running trials in your own formulation.