455830
Ammonium hydrogen difluoride
99.999% trace metals basis
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All Photos(2)
Synonym(s):
Ammonium bifluoride, Etching powder
Linear Formula:
NH4HF2
CAS Number:
Molecular Weight:
57.04
EC Number:
MDL number:
UNSPSC Code:
12352302
eCl@ss:
38050109
PubChem Substance ID:
NACRES:
NA.23
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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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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
Signal Word
Danger
Hazard Statements
Precautionary Statements
Hazard Classifications
Acute Tox. 3 Oral - Eye Dam. 1 - Skin Corr. 1B
WGK
WGK 1
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Personal Protective Equipment
dust mask type N95 (US), Eyeshields, Gloves
Regulatory Information
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Certificates of Analysis (COA)
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Find documentation for the products that you have recently purchased in the Document Library.
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)
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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