Metakaolin is an anhydrous pozzolanic material produced by the calcination of the clay mineral kaolinite.
Its particle size is smaller than that of cement but larger than silica fume. During cement hydration, metakaolin reacts with calcium hydroxide, refining the internal pore structure of concrete and enhancing its strength and durability.

METASTAR® 501 is a premium pozzolanic metakaolin produced through a highly controlled calcination process.
When applied to Portland cement–based concrete, plaster, and mortar, it significantly improves strength, durability, workability, and overall surface finish.

Unlike many other pozzolanic materials, METASTAR® 501 does not adversely affect color, making it particularly suitable for white and colored plaster applications where a bright and uniform finish is required.