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Sigma-Aldrich

Hydrofluoric acid

48 wt. % in H2O, ≥99.99% trace metals basis

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Synonym(s):
HF
Empirical Formula (Hill Notation):
HF
CAS Number:
Molecular Weight:
20.01
MDL number:
PubChem Substance ID:
NACRES:
NA.21

vapor density

1.27 (vs air)
1.27 (vs air)

Quality Level

vapor pressure

25 mmHg ( 20 °C)

assay

≥99.99% trace metals basis

form

liquid

concentration

48 wt. % in H2O

density

1.15 g/mL at 25 °C (lit.)

SMILES string

[H+].[F-]

InChI

1S/FH/h1H

InChI key

KRHYYFGTRYWZRS-UHFFFAOYSA-N

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General description

Hydrofluoric acid (HF) is the 48% solution of HF in water. It is weakly acidic in nature. Aqueous HF is mostly used in etching silicon in semiconductors and producing inorganic fluoride compounds. HF can also be used as fluorinating and deprotecting agent. As fluorination agent it also forms complexes with organic bases.

Application

Hydrofluoric acid is used:
  • To compose the electrolyte for the synthesis of TiO2 nanotube arrays.
  • As etchant for the glass fibers.
  • As capping reagent for the synthesis of anatase TiO2 nanocrystals/nanosheets.

pictograms

CorrosionSkull and crossbones

signalword

Danger

Hazard Classifications

Acute Tox. 1 Dermal - Acute Tox. 2 Inhalation - Acute Tox. 2 Oral - Eye Dam. 1 - Skin Corr. 1A

Storage Class

6.1B - Non-combustible, acute toxic Cat. 1 and 2 / very toxic hazardous materials

wgk_germany

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable


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