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Sigma-Aldrich

Silicon dioxide

purum p.a., acid purified, sand

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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:
12352300
PubChem Substance ID:
329769324

grade

purum p.a.

Quality Level

200

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

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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

wgk_germany

nwg

flash_point_f

Not applicable

flash_point_c

Not applicable

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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