455830
Ammonium hydrogen difluoride
99.999% trace metals basis
Synonym(s):
Ammonium bifluoride, Etching powder
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About This Item
Linear Formula:
NH4HF2
CAS Number:
Molecular Weight:
57.04
PubChem Substance ID:
eCl@ss:
38050109
UNSPSC Code:
12352302
NACRES:
NA.23
EC Number:
215-676-4
MDL number:
Assay:
99.999% trace metals basis
Form:
crystalline
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
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
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Danger
hcodes
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
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)
Chemical Communications (Cambridge, England), 1641-1641 (1996)
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)