PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ammonium hydrogen fluoride; (Ammonium bifluoride) | 1341-49-7 | 1727 |
15.01
4.01
11.01
4.08
4.05
7.00
11.00
4.09
4.06
4.07
|
|||||||||
| Formula | Synonyms | |||||||||||
| F2H5N | AMMONIUM BIFLUORIDE, SOLID, AMMONIUM BIFLUORIDE, SOLUTION, ACID AMMONIUM FLUORIDE, AMMONIUM ACID FLUORIDE, AMMONIUM BIFLUORIDE, AMMONIUM BIFLUORIDE (NH4HF2), AMMONIUM BIFLUORIDE (NH5F2), AMMONIUM DIFLUORIDE, AMMONIUM DIFLUORIDE (NH4HF2), AMMONIUM FLUORIDE (NH4HF2), AMMONIUM FLUORIDE COMPOUND WITH HYDROGEN FLUORIDE (1:1), AMMONIUM FLUORIDE HYDROFLUORIDE, AMMONIUM HYDROFLUORIDE (NH4HF2), AMMONIUM HYDROFLUORIDE (NH5F2), AMMONIUM HYDROGEN BIFLUORIDE, AMMONIUM HYDROGEN DIFLUORIDE, AMMONIUM HYDROGEN DIFLUORIDE (NH4(HF2)), AMMONIUM HYDROGEN FLUORIDE, AMMONIUM HYDROGEN FLUORIDE ((NH4)(HF2)), AMMONIUM HYDROGEN FLUORIDE (NH4HF2), AMMONIUM HYDROGEN FLUORIDE, SOLID, AMMONIUM HYDROGENDIFLUORIDE, SOLID, AMMONIUM MONOHYDROGEN DIFLUORIDE, BIFLUORURE D^AMMONIUM, SOLIDE (DOT FRENCH), BIFLUORURO DE AMONIO, SÓLIDO (DOT SPANISH), DIFLUORURO ÁCIDO DE AMONIO, SÓLIDO (DOT SPANISH), FLAMMON, FLUORURE ACIDE D'AMMONIUM, SOLIDE (DOT FRENCH), FLUORURO ÁCIDO DE AMONIO, SÓLIDO (DOT SPANISH), HYDROFLUORIC ACID COMPOUND WITH AMMONIUM FLUORIDE (NH4)F (1:, HYDROGÉNODIFLUORURE D'AMMONIUM, SOLIDE (DOT FRENCH) | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 57.06 | S | 126 | 1.51 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 11 | 130 | 750 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 4.7 | 56 | 320 |
Technical Basis
A review of available sources identified rat oral LD50 acute toxicity data for ammonium hydrogen fluoride. Reported GHS health hazard ratings (H318 and H310, Category 1/2; H331, inhalation Category 3) indicate a mid- to high-level health hazard, approximately equivalent between an HHR=2 and HHR=3 (TEEL-3 = 790 mg/m3 and 79 mg/m3, respectively). In addition, analysts evaluated fluoride exposure limits (TLV-TWA, IDLH) for TEEL development. Data sources were selected according to the hierarchy listed in Table 3.1. Toxicity data were selected according to type of exposure, species, and route according to the hierarchies stated in Sections 3.3.1, 3.3.2, and evaluating using factors in Tables 3.2, 3.3, and 3.4. The 1990 fluoride IDLH was selected as the TEEL-3 basis and a compound adjustment factor was applied (Section 3.2.2). The resulting TEEL-3 is within the expected range of the GHS analysis. TEEL-2 values were calculated according to Table 3.5. The TLV-TWA was selected as the TEEL-1 basis and was adjusted using a compound adjustment factor and a multiplying factor (Section 3.2.2, Table 3.5).
• PAC-1 = TEEL-1 = MW-adjusted TLV-TWA (fluoride, as F; 2.5 mg/m3) x 3
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = MW-adjusted IDLH (1990, fluoride, as F; 500 mg/m3)
This review generated PAC values consistent Rev. 29A.
• PAC-1 = TEEL-1 = MW-adjusted TLV-TWA (fluoride, as F; 2.5 mg/m3) x 3
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = MW-adjusted IDLH (1990, fluoride, as F; 500 mg/m3)
This review generated PAC values consistent Rev. 29A.
References
Chemical information and acute toxicity data retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Ammonium-bifluoride
IDLH: https://www.cdc.gov/niosh/idlh/fluoride.html
Exposure limits: https://www.osha.gov/chemicaldata/806