Celite 545 is a diatomaceous earth product, specifically a flux-calcined diatomaceous earth, manufactured by Merck. It's characterized by its particle size of 0.02-0.1 mm and is commonly used as a filtration aid, particularly in aqueous solutions and for highly viscous liquids. It's known for its high porosity and ability to facilitate rapid filtration. Here's a more detailed breakdown:
Composition:Celite 545 is primarily composed of silica, with minor amounts of alumina and iron oxide.
Physical Properties:It has a density of 2.36 g/cm³ at 20°C, a melting point above 450°C, and a pH of 10 (100 g/l, H₂O, 20°C).
Particle Size:The particle size range is 0.02-0.1 mm (20-100 μm), according to Merck and Sigma-Aldrich.
Applications:Celite 545 is widely used as a filter aid due to its porous structure, which allows for efficient filtration. It is suitable for filtering various substances, including:
Aqueous solutions
Highly viscous liquids like casein, pectin, adhesives, greases, waxes, tars, syrups, and synthetic resins
Activated carbon and other impurities in filtration processes
Safety Information:Celite 545 is classified as hazardous. It can cause damage to organs through prolonged or repeated exposure if inhaled (H372). Merck Millipore provides specific safety precautions:
Do not breathe dust.
Wash skin thoroughly after handling.
Do not eat, drink, or smoke while using the product.
