Neutral ammonium fluoride
Ammonium fluoride
CAS: 12125-01-8
Molecular Formula: FH4N
Neutral ammonium fluoride - Names and Identifiers
Neutral ammonium fluoride - Physico-chemical Properties
| Molecular Formula | FH4N |
| Molar Mass | 37.04 |
| Density | 1.11g/mLat 20°C |
| Melting Point | 98°C |
| Boling Point | 65°C/760mmHg |
| Water Solubility | soluble |
| Solubility | H2O: 1M at20°C, clear, colorless |
| Vapor Presure | 0Pa at 25℃ |
| Appearance | Powder/Solid |
| Specific Gravity | 1.009 |
| Color | White |
| Odor | Odorless |
| Exposure Limit | ACGIH: TWA 2.5 mg/m3NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 |
| Merck | 14,522 |
| pKa | -1.75±0.70(Predicted) |
| PH | 6 (50g/l, H2O, 20℃) |
| Storage Condition | Store at +15°C to +25°C. |
| Stability | Stable. Incompatible with strong oxidizing agents, water, most common metals, strong bases, strong acids. Attacks glass. |
| Sensitive | Hygroscopic |
| Physical and Chemical Properties | Characteristics of colorless leaf-like or needle-like crystals, after sublimation to hexagonal columnar crystals. Deliquescence. The solubility is easily soluble in water, and the aqueous solution is acidic. Soluble in alcohol, insoluble in acetone and liquid ammonia. density 1.11g/mL at 20°C storage conditions Store at RT. solubility H2O: 1 M at 20°C, clear, colorless water-soluble soluble sensitive hygropic Merck 14,522 |
| Use | Used as glass etchant, antiseptic, disinfectant, fiber mordant and extraction of rare metals |
Neutral ammonium fluoride - Risk and Safety
| Hazard Symbols | T - Toxic |
| Risk Codes | R23/24/25 - Toxic by inhalation, in contact with skin and if swallowed. R41 - Risk of serious damage to eyes |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S1/2 - Keep locked up and out of the reach of children. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S39 - Wear eye / face protection. S36/37 - Wear suitable protective clothing and gloves. |
| UN IDs | UN 2505 6.1/PG 3 |
| WGK Germany | 1 |
| RTECS | BQ6300000 |
| FLUKA BRAND F CODES | 3-9 |
| TSCA | Yes |
| HS Code | 28261910 |
| Hazard Class | 6.1 |
| Packing Group | III |
| Toxicity | LD50 ipr-rat: 31 mg/kg XEURAQ UR-154,1951 |
Neutral ammonium fluoride - Upstream Downstream Industry
Neutral ammonium fluoride - Nature
Open Data Verified Data
This product is a colorless transparent liquid with a density of 1.1 LLG/mL at 25 °c. It is weakly acidic and corrosive to glass. It cannot coexist with chlorine trifluoride, quinine and soluble calcium salt. Heat decomposition, release of toxic fluoride ions, nitrogen oxides and ammonia smoke.
Last Update：2025-06-10 22:55:16
Neutral ammonium fluoride - Preparation Method
Open Data Verified Data
There are mainly two processes: Liquid-liquid synthesis and gas-liquid synthesis. The preparation of BV-grade III ammonium fluoride solution mainly adopts gas-liquid synthesis, first, the industrial raw material liquid ammonia is purified, and the high purity ammonium fluoride aqueous solution is prepared by absorbing with hydrofluoric acid, and then the super clean filtration is performed.
Last Update：2025-06-10 22:55:16
Neutral ammonium fluoride - Application
Open Data Verified Data
ammonium fluoride solution can be used as a cleaning agent, etchant, can be formulated with hydrofluoric acid as a buffer solution, MOS level is mainly used for medium and large scale integrated circuits, BV-III level is mainly used for the production of IC.
Last Update：2025-08-19 16:24:40
Neutral ammonium fluoride - Safety
Open Data Verified Data
rats were injected intraperitoneally with LDso:32mg/kg. Toxic, with strong irritation. Contact with the product can cause eye, respiratory and skin burns. It can be absorbed through the skin. Long-term exposure causes dental fluorosis and skeletal fluorosis. Store in a cool, ventilated warehouse. Keep away from fire and heat source.
Protection from direct sunlight. The packaging is sealed. Should be stored separately with acids, alkalis, edible chemicals, not mixed storage. The storage area shall be provided with suitable materials for containment of the leakage.
Last Update：2025-06-10 22:55:16
Neutral ammonium fluoride - Reference Information
| pH indicator color change ph range | Aqueous solution is an acid |
| LogP | -4.37 at 25℃ |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | ammonium fluoride is a kind of fluorine chemical product widely used in fluorine chemical industry. ammonium fluoride is colorless leaf-shaped or needle-shaped crystal, easy to deliquesce in air, easy to dissolve in water, acidic aqueous solution, and toxic corrosive flue gas is released by thermal decomposition. |
| Application | Ammonium fluoride is widely used: metallurgical soil industry is used to extract rare metals; glass industry is used as etchant; brewing industry is used as bacterial inhibitor for beer disinfection; machinery industry is used as chemical polishing agent for metal surface; wood industry is used as etchant; chemical analysis is used as masking agent for ion detection, drip reagent for content, precipitant for combined titration of aluminum; it is used to configure titrant to determine lead, copper and zinc in copper alloy, iron ore and coal tar. |
| Ammonium bifluoride | Ammonium bifluoride is white or colorless transparent orthorhombic crystal at room temperature, with a slight sour taste. Poisonous! Slightly soluble in alcohol, easily soluble in cold water, decomposed in hot water, and the aqueous solution is strongly acidic. It is obtained by neutralizing anhydrous hydrofluoric acid and liquid ammonia. It can corrode glass and is corrosive to skin. It can be used as a chemical reagent, a glass etchant (involved in the use of hydrofluoric acid), a fermentation industry disinfectant and a preservative, a solvent for making beryllium metal from beryllium oxide, and a surface treatment agent for silicon steel plates. It is also used to make ceramics, magnesium alloys, cleaning and descaling of boiler water supply systems and steam generation systems, and acid treatment of oil field sand and gravel. It is also used as a catalyst component for alkylation and isomerization. The production process of ammonium bifluoride is generally to form ammonium fluoride, and then continue to pass in hydrogen fluoride to form ammonium bifluoride. If the control is not good, it will become a mixture of ammonium fluoride and ammonium bifluoride. Ammonium fluoride is easy to decompose to produce ammonium bifluoride. |
| toxicity | this product is toxic. Operators must wear protective equipment. See ammonium bifluoride for the remaining protective measures. |
| use | used as glass etchant, preservative, disinfectant, fiber mordant and extraction of rare metals, etc. used as glass etchant, chemical polishing agent for metal surface, disinfectant for wine making, preservative, mordant for fiber. It is also used to extract rare elements, etc. used as analytical reagent, preservative and masking agent wood preservative, carved glass, complex titration of aluminum precipitant, extraction of rare elements, drip analysis of zirconium. |
| production method | liquid phase method put quantitative hydrofluoric acid in lead or plastic containers. Cool with water outside the container, and slowly pass in ammonia under stirring until the Ph value of the reaction liquid reaches about 4. The reaction solution is cooled and crystallized, centrifuged, and air-dried to produce ammonium fluoride products. Its NH3 HF → NHF |
| category | toxic substances |
| toxicity classification | highly toxic |
| acute toxicity | abdominal cavity-rat LD50: 31 mg/kg; Subcutaneous-fox LDL0: 280 mg/kg |
| flammability hazard characteristics | decomposition of toxic and combustible ammonia gas by heating; toxic hydrogen fluoride gas released by acid |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; Separate storage and transportation from acids, alkalis, food and CLF3 |
| fire extinguishing agent | water |
| occupational standard | TWA 2.5 mg (fluorine)/m3; STEL 5 mg (fluorine)/m3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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Raw Materials for Neutral ammonium fluoride