Micro silica fume accord with GBT 27690-2011 mortar and concrete silica fume standard, USA ASTM and EU SGS standard.
Manufacturers directly deliver products, export to Europe and America countries. The content of silicon is more than 85%, the moisture is less than 1%, and the firing vector is less than 3%.
SGS-CSTC ASTM C 1240-11 Microsilica Fume Testing report:
