Sodium fluoride , PT , 7681-49-4
Synonym(s):
Sodium fluoride;Sodium fluoride solution;Sodium monofluoride;Sodium monofluoride (NaF);Disodium Fluoride
CAS NO.：7681-49-4
Empirical Formula: FNa
Molecular Weight: 41.99
MDL number: MFCD00003524
EINECS: 231-667-8
PRODUCT Properties
| Melting point: | 993 °C (lit.) |
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| Boiling point: | 1700 °C |
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| Density | 1.02 g/mL at 20 °C |
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| vapor pressure | 1.4 mm Hg ( 0 °C) |
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| refractive index | 1.336 |
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| Flash point: | 1704°C |
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| storage temp. | 2-8°C |
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| solubility | H2O: 0.5 M at 20 °C, clear, colorless |
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| form | powder |
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| Specific Gravity | 2.558 |
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| color | White to off-white |
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| Odor | Odorless |
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| PH | 7.0-10.0 (25℃, 0.5M in H2O) |
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| Water Solubility | 4 g/100 mL (25 ºC) |
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| Sensitive | Hygroscopic |
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| Crystal Structure | NaCl type |
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| crystal system | Cube |
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| Merck | 14,8618 |
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| Space group | Fm3m |
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| Lattice constant |
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| Exposure limits | ACGIH: TWA 2.5 mg/m3 NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 |
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| Stability: | Stable. Hydrolyzed by water. Reacts with mineral acids to generate highly toxic hydrogen fluoride. Incompatible with glass. |
Description and Uses
Sodium fluoride, NaF, is a binary salt that is a clear, lustrous crystal or white powder. The insecticide grade is frequently dyed blue. It is soluble in water and has a specific gravity of 2.558, which is heavier than water. Sodium fluoride is highly toxic by ingestion and inhalation, and is also strongly irritating to tissue. The TLV is 2.5 mg/m3 of air. The four-digit UN identification number is 1690. The primary uses are fluoridation of municipal water at 1 ppm, as an insecticide, rodenticide, and fungicide, and in toothpastes and disinfectants.
Sodium fluoride, formed by reaction of sodium carbonate and hydrofluoric acid, and then evaporating. Used (1) as an antiseptic and antifermentative in alcohol distilleries, (2) as a food preservative, (3) as a poison for rats and roaches, (4) as a constituent of ceramic enamels and fluxes; sodium hydrogen fluoride, sodium difluoride, sodium acid fluoride, NaHF2, white solid, soluble, formed by reaction of sodium carbonate and excess hydrofluoric acid, and then evaporating. Used (1) as an antiseptic, (2) for etching glass, (3) as a food preservative, (4) for preserving zoological specimens.
Safety
| Symbol(GHS) |  GHS06 |
| Signal word | Danger |
| Hazard statements | H301-H315-H319 |
| Precautionary statements | P264-P270-P280-P301+P310-P302+P352-P305+P351+P338 |
| Hazard Codes | T,Xn |
| Risk Statements | 25-32-36/38-22 |
| Safety Statements | 23-24/25-45-36-22 |
| RIDADR | UN 1690 6.1/PG 3 |
| OEB | B |
| OEL | TWA: 2.5 mg/m3 [*Note: The REL also applies to other inorganic, solid fluorides (as F).] |
| WGK Germany | 1 |
| RTECS | WB0350000 |
| F | 10 |
| Hazard Note | Toxic/Hygroscopic |
| TSCA | Yes |
| HS Code | 2826 19 10 |
| HazardClass | 6.1 |
| PackingGroup | III |
| Toxicity | LD50 orally in rats: 0.18 g/kg (Smyth) |
