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Sigma-Aldrich

Calcium sulfate dihydrate

puriss., meets analytical specification of NF, E 516, 99.0-101.0% (based on anhydrous substance)

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About This Item

Linear Formula:
CaSO4 · 2H2O
CAS Number:
10101-41-4
Molecular Weight:
172.17
EC Number:
231-900-3
MDL number:
MFCD00149625
UNSPSC Code:
12352300
PubChem Substance ID:
329749608
NACRES:
NA.21

grade

puriss.

Quality Level

200

assay

99.0-101.0% (based on anhydrous substance)

form

powder

quality

meets analytical specification of NF, E 516

impurities

residual solvents, in accordance
≤0.001% heavy metals (as Pb)

loss

19.0-23.0% loss on drying, 250 °C

anion traces

chloride (Cl-): ≤100 mg/kg
fluoride (F-): ≤30 mg/kg

cation traces

As: ≤3 mg/kg
Fe: ≤50 mg/kg
Hg: ≤10 mg/kg
Pb: ≤5 mg/kg
Se: ≤30 mg/kg

SMILES string

O.O.[Ca++].[O-]S([O-])(=O)=O

InChI

1S/Ca.H2O4S.2H2O/c;1-5(2,3)4;;/h;(H2,1,2,3,4);2*1H2/q+2;;;/p-2

InChI key

PASHVRUKOFIRIK-UHFFFAOYSA-L

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Related Categories

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

Certificates of Analysis (COA)

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The crystallization of calcium sulfate dihydrate.
Smith BR and Sweett F.
Journal of Colloid and Interface Science, 37(3), 612-618 (1971)
Calcium sulfate dihydrate (gypsum) scale formation on heat exchanger surfaces: The influence of scale inhibitors.
Amjad Z.
Journal of Colloid and Interface Science, 123(2), 523-536 (1988)
K N Lewis et al.
Journal of materials science. Materials in medicine, 17(6), 531-537 (2006-05-13)
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Dissolution processes at single crystal surfaces often involve the initial formation and expansion of localized, characteristic (faceted) etch-pits at defects, in an otherwise comparatively unreactive surface. Using natural gypsum single crystal as an example, a simple but powerful morphological analysis
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