Supplier: MilliporeSigma

Fine gray powder. Complex silicates of aluminum, potassium, sodium, and iron. Less than 400 mesh, 75% is at mesh #140. Insoluble in water.

Supplier: Thermo Scientific Chemicals

Pumice stone, granular (∼ 1-5 mm)

Supplier: Honeywell Research Chemicals

Pumice stone, CAS Number: 1332-09-8, Grade: Analytical Reagent, Purity: >/= 99.9%, Linear Formula: 78.13 g/mol, Adsorbent Filter Aid, granular, 4-6 mm, Size: 1KG

Supplier: Honeywell Research Chemicals

Pumice stone, Analytical, granulated, CAS Number: 1332-09-8, CAS Number: 1332-09-8, Grain size 2-5 mm min.95 %, Particle Size 2-5 mm (determined by sieving), Adsorbent Filter Aid, Size: 1KG