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Merck

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:
1341-49-7
Molecular Weight:
57.04
PubChem Substance ID:
24869086
eCl@ss:
38050109
UNSPSC Code:
12352302
NACRES:
NA.23
EC Number:
215-676-4
MDL number:
MFCD00012018
Assay:
99.999% trace metals basis
Form:
crystalline

Key Documents

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InChI key

KVBCYCWRDBDGBG-UHFFFAOYSA-N

InChI

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

SMILES string

N.F.F

assay

99.999% trace metals basis

form

crystalline

impurities

≤15.0 ppm Trace Metal Analysis

mp

125 °C (lit.)

Quality Level

100

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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

pictograms

Skull and crossbonesCorrosion
GHS06,GHS05

signalword

Danger

hcodes

H301,H314

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

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

Deleterious substance

pdsc

Class I Designated Chemical Substances

prtr

Substances Subject to be Indicated Names

ishl_indicated

Substances Subject to be Notified Names

ishl_notified

455830-100G:4548173153780 + 455830-25G:4548173153797 + 455830-BULK: + 455830-VAR:

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Certificates of Analysis (COA)

Lot/Batch Number
MKCQ9113
MKCP1143
MKCP0859
MKCN0280
MKCK5230

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Zeitschrift fur Anorganische und Allgemeine Chemie, 622, 1646-1646 (1996)
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)
Xun, X. et al.
Chemistry of Materials, 9, 2966-2966 (1997)
Sebastian Ribi et al.
Oncotarget, 6(10), 7727-7740 (2015-03-13)
Somatic mutations of TP53 are among the most common in cancer and germline mutations of TP53 (usually missense) can cause Li-Fraumeni syndrome (LFS). Recently, recurrent genomic rearrangements in intron 1 of TP53 have been described in osteosarcoma (OS), a highly
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