Sieving Aid is a very fine (5—7µm), high purity silicon dioxide powder. When mixed with fine samples (2% by weight is typical), Sieving Aid keeps material free-flowing and prevents agglomeration from static attraction or high humidty. It also acts as a dehydrating agent for samples. Addition of Sieving Aid does not affect sieving results, because of its extremely low bulk density of 7lb/ft³ (112kg/m³). 1L is sufficient for over 100 sieving tests. Typical dry purity is 99.6% SiO2. Available as individual 1 liter bottles or convenient 5-packs.