실리카흄의 입자는 매우 작습니다.. 평균적으로, 입자는 약 0.1 마이크로미터 (100 나노미터) 직경. 이것을 관점에서 보자면, if a typical silica fume particle was the size of a football, then a single grain of cement would be about the size of a car.

The small particle size is a key reason why silica fume is so effective as a pozzolan in concrete. It fills in the gaps between larger particles, reducing the porosity and increasing the strength and durability of the finished product.