PR-N20 is PlaxRaw’s standard, general-purpose natural ground calcium carbonate (GCC) grade — a mean particle size (D50) around 20 microns, the most commonly specified point in the GCC range across plastics, paints, and general filler applications.
This is the default grade to reach for when a formulation calls for “calcium carbonate filler” without a tighter fineness requirement: it balances loading capacity, cost, and processability, and is the typical starting point for injection-molded plastic compounds using calcium carbonate as an extender/filler.
What this page is, honestly: the values above are typical, published ranges for standard ground calcium carbonate drawn from industry references (cited below), not a certificate of analysis from one named supplier. Treat them as a starting specification to confirm against the actual shipment’s TDS before use in a formulation-critical application.