84878

Silicon dioxide

purum p.a., acid purified, sand

• Synonym(s): Cristobalite, Quartz, Sand, Silica
• Linear Formula: SiO₂
• CAS Number: 60676-86-0
• Molecular Weight: 60.08
• EC Number: 238-878-4
• MDL number: MFCD00011232
• UNSPSC Code: 12352303
• PubChem Substance ID: 329769324

Properties

• grade: purum p.a.
• form: sand
• quality: acid purified
• loss: ≤0.1% loss on ignition, 900 °C
• refractive index: n20/D 1.544 (lit.)
• particle size: 40-150 mesh
• mp: 1610 °C (lit.)
• density: 2.6 g/mL at 25 °C (lit.)
• anion traces: chloride (Cl^-): ≤100 mg/kg
• cation traces: Ca: ≤50 mg/kg; Cd: ≤50 mg/kg; Co: ≤50 mg/kg; Cu: ≤50 mg/kg; Fe: ≤100 mg/kg; K: ≤500 mg/kg; Na: ≤200 mg/kg; Ni: ≤50 mg/kg; Pb: ≤50 mg/kg; Zn: ≤50 mg/kg
• SMILES string: O=[Si]=O
• InChI: 1S/O2Si/c1-3-2
• InChI key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N

Description

General description

Silicon dioxide is one of the important constituents of sedimentary rock bauxite, basalt fibers and ceramic fibers. It is added to cement for improving the hydraulic properties of cement.

Application

Silicon dioxide may be employed in the preparation of calcium silicide.

Caution

may contain dark particles

Analysis Note

metal and chloride traces refer to acid-soluble parts

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: nwg
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable