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Sigma-Aldrich

Ammonium hydrogen difluoride

Ammonium hydrogen difluoride

99.999% trace metals basis

Synonym(s):

Ammonium bifluoride, Etching powder

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25 G
$106.00
100 G
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About This Item

Linear Formula:
NH4HF2
CAS Number:
1341-49-7
Molecular Weight:
57.04
EC Number:
215-676-4
MDL number:
MFCD00012018
UNSPSC Code:
12352302
eCl@ss:
38050109
PubChem Substance ID:
24869086
NACRES:
NA.23
assay:
99.999% trace metals basis
form:
crystalline

$106.00

Available to ship onApril 29, 2025Details

Request a Bulk Order

Quality Level

100

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.[1][2]

Application

Used for the preparation of ammonium aminosilylfluorides[3] and complex metal fluorides.[4] 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[5]

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_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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Certificates of Analysis (COA)

Lot/Batch Number
MKCV7194
MKCT1181
MKCQ9113
MKCS0553
MKCR9976

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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)
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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Questions

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  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  1. Wichita Falls, Texas
    • Review 1
    • Votes 0
    5 out of 5 stars.

    The material quality was first rate and delivery was fast.

    The material quality was first rate and delivery was fast.

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