When sourcing calcium carbonate lumps in Vietnam, it helps to follow a clear, step‑by‑step procurement process: 1. Define Your Technical & Commercial Requirements Grade & Purity: Industrial (≥98 % CaCO₃), food‑grade, pharma‑grade, etc. Size & Form: Lump size (e.g. 10–50 mm), chips, blocks. Quantity: Tons per shipment, annual volumes. Packaging…