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455830

Sigma-Aldrich

Ammonium hydrogen difluoride

99.999% trace metals basis

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Synonym(s):
Ammonium bifluoride, Etching powder
Linear Formula:
NH4HF2
CAS Number:
Molecular Weight:
57.04
EC Number:
MDL number:
eCl@ss:
38050109
PubChem Substance ID:
NACRES:
NA.23

Quality Level

assay

99.999% trace metals basis

form

crystalline

impurities

≤15.0 ppm Trace Metal Analysis

mp

125 °C (lit.)

SMILES string

N.F.F

InChI

1S/2FH.H3N/h2*1H;1H3

InChI key

KVBCYCWRDBDGBG-UHFFFAOYSA-N

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1 of 4

This Item
2248201.01160AX1235
Ammonium hydrogen difluoride 99.999% trace metals basis

455830

Ammonium hydrogen difluoride

-
Ammonium hydrogen difluoride reagent grade, 95%

224820

Ammonium hydrogen difluoride

Essential Grade
Ammonium hydrogen difluoride pure

1.01160

Ammonium hydrogen difluoride

-
Ammonium Bifluoride Practical

AX1235

Ammonium Bifluoride

-
assay

99.999% trace metals basis

assay

95%

assay

-

assay

≥96.0%

Quality Level

100

Quality Level

100

Quality Level

200

Quality Level

200

impurities

≤15.0 ppm Trace Metal Analysis

impurities

-

impurities

-

impurities

-

mp

125 °C (lit.)

mp

125 °C (lit.)

mp

125 °C (lit.)

mp

126 °C

General description

Ammonium hydrogen difluoride is a white crystalline solid commonly used as an etchant, especially in the semiconductor industry. It has excellent selectivity in etching silicon oxides and metal silicides, making it useful in the manufacturing of semiconductors and microelectronic devices. It can also be used as a fluorinating agent.

Application

Used for the preparation of ammonium aminosilylfluorides and complex metal fluorides. Employed in a new hydrothermal synthesis of complex flourides NaHoF4 and NaEuF4; these interesting compounds have the fluorite structure and are important for solid-state lasers as well as for photoluminescence and magnetic characteristics

pictograms

CorrosionSkull and crossbones

signalword

Danger

Hazard Classifications

Acute Tox. 3 Oral - Eye Dam. 1 - Skin Corr. 1B

Storage Class

6.1D - Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges


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Fluorination of sulfide minerals with ammonium hydrogen difluoride
N.M Laptash et al.
Journal of Fluorine Chemistry, 105, 53-58 (2000)
Acid etching as surface treatment method for luting of glass-ceramic restorations, part 1: acids, application protocol and etching effectiveness
Bajraktarova-Valjakova, et al.
Open access Macedonian journal of medical sciences, 6, 568-568 (2018)
Chemical Communications (Cambridge, England), 1641-1641 (1996)
Zeitschrift fur Anorganische und Allgemeine Chemie, 622, 1646-1646 (1996)
Xun, X. et al.
Chemistry of Materials, 9, 2966-2966 (1997)

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