455830

Ammonium hydrogen difluoride

99.999% trace metals basis

• Synonym(s): Ammonium bifluoride, Etching powder
• 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

Properties

• 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

Description

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

Safety Information

• Pictograms: GHS06,GHS05
• Signal Word: Danger
• Hazard Statements: H301,H314
• Precautionary Statements: P260 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338 - P363
• Hazard Classifications: Acute Tox. 3 Oral - Eye Dam. 1 - Skin Corr. 1B
• Storage Class Code: 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
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves