What is Levasil?
Levasil CB30 is an alkaline, aqueous dispersion of colloidal silica that is approximately 30% solids by weight. The silica dispersion is sodium stabilized and the amorphous silica particles carry a negative surface charge.
Is fumed silica the same as colloidal silica?
The fumed silica slurry (slurry A) and colloidal silica slurry (slurry B) differ in their physical properties due to their different manufacturing processes. The size and shape of the abrasives are just as different as the pH value of the suspensions and thus also the polishing behaviour of the two slurries.
How is colloidal silica made?
In the most general terms colloidal silica is a dispersion of amorphous silicon dioxide (silica) particles in water. These amorphous silica particles are produced by polymerizing silica nuclei from silicate solutions under alkaline conditions to form nanometer sized silica sols with high surface area.
What is nano silica?
Nanosilica, also called quartz dust or silica dust, is a material that, like SF, is characterized by its high SiO2 percentage, over 99%. The use of nanosilica (crystalline SiO2) reduces the volume of cement and completes the grading curve of the aggregate mix in the zone of the smallest sizes.
How do you use fumed silica?
Like silica gel, it serves as a desiccant. It is used in cosmetics for its light-diffusing properties. It is used as a light abrasive, in products like toothpaste. Other uses include filler in silicone elastomer and viscosity adjustment in paints, coatings, printing inks, adhesives and unsaturated polyester resins.
What is the use of colloidal silica?
Colloidal silica is used in a broad range of industries and applications, including: Densification of concrete, cement, and other materials. Fine retention in paper manufacturing. Enhanced bonding of waterborne adhesives.
Is nano silica toxic?
Studies have shown that occupational crystalline silica exposure induces silicosis (a fibrotic lung disease) in workers and that this exposure is associated with other lung diseases, such as lung cancer, emphysema and pulmonary tuberculosis [24].
What is nano silica made of?
Nano-SiO2 is a white fluffy powder composed of high purity amorphous silica powder.
Is fumed silica toxic?
Fumed silica is an non-toxic non-harmful material. It is not combustible nor explosive. In fact fumed silica has been applied in cosmetic, food and drugs for years. Due to its strong hygroscopicity(absorbing moisture), it may caused dry skin when directly contacted with skin.
Does fumed silica cause silicosis?
No known health effects are found from exposure to crystalline silica at the levels normally found in the environment. small crystalline silica particles for a long time (typically years) can develop silicosis, a serious lung disease.
What are benefits of silica?
A 2016 study by Sao Paulo University, Brazil reported that silica helps form the building blocks of collagen, an important protein found in your skin, blood, cartilage, muscles and ligaments. Collagen is needed to keep skin springy and elastic, and provide crucial protection and structure to your organs and joints.
What is nano silica used for?
The chief applications of silica nanoparticles are as an additive for the manufacture of rubber and plastics; as a strengthening filler for concrete and other construction composites; and as a stable, non-toxic platform for biomedical applications such as drug delivery and theranostics.
