Phosphoric acid
- White phosphoric acid
- Orthophosphoric acid
- Amberphos 54
- 3M Etching Liquid
- Ultra-Etch Gel
- WC-Reiniger
Phosphoric acid | |
| |
| Formula | H3PO4 |
| Structure | |
| Description | Colorless, odorless, syruppy liquid. |
| Uses | Polymer gasoline catalyst, etchant (semiconductor manufacture), acidulant (soft drinks, prepared foods), aluminum brighteninganodizing agent, aluminumsteelmagnesiumzinc anticorrosion treatment reagent, microbial fermentation nutrient, refractories raw material. |
| Registry Numbers and Inventories. | |
| CAS | 7664-38-2 |
| EC (EINECS/ELINCS) | 231-633-2 |
| EC Index Number | 015-011-00-6 |
| EC Class | Corrosive |
| EC Risk Phrase | R 34 |
| EC Safety Phrase | S 26 45 |
| RTECS | TB6300000 |
| RTECS class | Mutagen; Human Data; Primary Irritant |
| UN (DOT) | 1805 |
| Merck | 12,7500 |
| Beilstein/Gmelin | 2000 (G) |
| EPA OPP | 76001 |
| Swiss Giftliste 1 | G-9514 |
| Canada DSL/NDSL | DSL |
| US TSCA | Listed |
| Austrailia AICS | Listed |
| New Zealand | Listed |
| Japan ENCS (MITI) | Listed |
| Korea ECL | Listed |
| Properties. | |
| Formula | H3O4P |
| Formula mass | 98.0 |
| Melting point, °C | 21 |
| Boiling point, °C | 158 |
| Vapor pressure, mmHg | 0.01 (130 C) |
| Vapor density (air=1) | 3.4 |
| Density | 1.541 g/cm3 |
| Solubility in water | Very soluble |
| Viscosity | 3.86 cp (40% solution at 20C). |
| Surface tension | 74.6 erg/cm2 (20 C) |
| Refractive index | 1.3420 (20 C) |
| pKa/pKb | 1.97 (pKa) |
| Partition coefficient, pKow | -2.15 |
| Heat of fusion | 10.6 kJ/mol |
| Hazards and Protection. | |
| Storage | May be stored in suitable stainless steel containers. (Hot acid attacks porcelain and graniteware). |
| WHMIS | E |
| Handling | Containers of this material may be hazardous when emptied. Since emptied containers retain product residues (vapor, liquid, and/or solid), all hazard precautions given in the data sheet must be observed. Addition to water releases heat which can result in violent boiling and spattering. Always add slowly and in small amounts. Never use hot water. Never add water to acids. Always add acids to water. |
| Protection | Wear appropriate protective gloves, clothing and goggles. |
| Respirators | Wear positive pressure self-contained breathing apparatus (SCBA). |
| Small spills/leaks | Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Neutralize spilled material with crushed limestone, soda ash, or lime. Apply water spray or mist to knock down vapors. Vapor knockdown water is corrosive or toxic and should be diked for containment. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Absorb bulk liquid with fly ash or cement powder. Neutralize with agricultural lime (CaO), crushed limestone (CaCO3) or sodium bicarbonate (NaHCO3). Water spill: Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3). Adjust pH to neutral (pH=7). Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates. |
| Stability | Stable. |
| Incompatibilities | Reacts exothermically with bases May react with active metals, including such structural metals as aluminum and iron, to release hydrogen, a flammable gas Reacts with cyanide compounds to release gaseous hydrogen cyanide Reacts violently with sodium tetrahydroborate. |
| Decomposition | Oxides of phosphorus are formed during thermal decomposition. Decomposition products: converted to pyrophosphoric acid (H4P2O7) when heated to 213 C. |
| Fire. | ||||
| Fire fighting | Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. | |||
| Fire potential | May heat combustibles to ignition point. | |||
| Hazards | Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. | |||
| Combustion products | Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. | |||
| NFPA | Health | 2 | ||
| Flammability | 0 | |||
| Reactivity | 0 | |||
| Health. | |
| Exposure limit(s) | OSHA PEL: TWA 1 mg/m3 NIOSH REL: TWA 1 mg/m3 ST 3 mg/m3 NIOSH IDLH: 1000 mg/m3 |
| Poison_Class | 5 |
| Exposure effects | Coma and seizures have occurred. |
| Ingestion | Irritation or burns of the oropharynx, esophagus, or gi tract may occur following ingestion. Nausea, vomiting, abdominal pain, hematemesis, bloody diarrhea, and perforation with severe burns may be noted. |
| Inhalation | Respiratory tract irritation and coughing may develop. Aspiration pneumonitis has occurred. |
| Skin | Dermal irritation or burns may develop. |
| Eyes | Eyes, nose, and throat irritation may occur. |
First aid |
|
| Ingestion | Seek medical assistance. |
| Inhalation | Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. |
| Skin | Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists. |
| Eyes | Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility. |
| Transport. | ||
| UN number | 1805 | |
| Response guide | 154 | |
| Hazard class | 8 | |
| Packing Group | III | |
| USCG CHRIS Code | PAC | |
| USCG Compatatibility Group | 1 Non-oxidizing mineral acids | |
| Std. Transport # | 4930248 4930247 4930249 | |
| IMO Chemical Code | 17 | |
| IMO Pollution Category | D | |
| IMO Hazard code | S | |