The best choice for you with vietnamese calcium carbonate powder with coated powder, uncoated powder, granule and white limestone lump as per customerâ??s demand at mong son factory- yen bai, hai phong port. Our own mine locates at mong son province (called mong son valley) with the calcium carbonate content more than 98% which being considered as the best quality of raw materials. Quality control process is strictly ensured from selecting incoming material to check out-going finished products by most modern testing equipment in the world. -
