Methacrylic acid
- Methacrylic acid, inhibited
- 2-Methylpropenoic acid
- alpha-Methylacrylic acid
Methacrylic acid | |
| |
| Formula | C4H6O2 |
| Structure | |
| Description | Colorless liquid or solid with an acrid, repulsive odor. |
| Uses | Manufacture of methacrylate resins & plastics. |
| Registry Numbers and Inventories. | |
| CAS | 79-41-4 |
| EC (EINECS/ELINCS) | 201-204-4 |
| EC Index Number | 607-088-00-5 |
| EC Class | Harmful; Corrosive |
| EC Risk Phrase | R 21/22 35 |
| EC Safety Phrase | S 26 36/37/39 45 |
| RTECS | OZ2975000 |
| RTECS class | Drug; Mutagen; Human Data |
| UN (DOT) | 2531 |
| Merck | 13,5967 |
| Beilstein/Gmelin | 1719937 |
| Beilstein Reference | 4-02-00-01518 |
| Swiss Giftliste 1 | G-5958 |
| Canada DSL/NDSL | DSL |
| US TSCA | Listed |
| Austrailia AICS | Listed |
| New Zealand | Listed |
| Japan ENCS (MITI) | Listed |
| Korea ECL | Listed |
| Properties. | |
| Formula | C4H6O2 |
| Formula mass | 86.09 |
| Melting point, °C | 15 |
| Boiling point, °C | 163 |
| Vapor pressure, mmHg | 1.23 (25 C) |
| Vapor density (air=1) | 2.97 |
| Saturation Concentration | 0.09% at 20 C |
| Critical temperature | 361 |
| Critical pressure | 45.9 |
| Density | 1.02 g/cm3 (20 C) |
| Solubility in water | 90 g/L (20 C) |
| Viscosity | 1.4 mPa (20 C)) |
| Refractive index | 1.42815 (20 C) |
| pKa/pKb | 4.65 (pKa) |
| Partition coefficient, pKow | 0.93 |
| Heat of vaporization | 42.28 kJ/mol |
| Heat of combustion | -2017 kJ/mol |
| Hazards and Protection. | |
| Storage | Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage. |
| WHMIS | E D1B |
| Handling | All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood. |
| Protection | Wear appropriate chemical protective gloves, boots and goggles. If contact with the material anticipated, wear appropriate chemical protective clothing. |
| Respirators | Wear positive pressure self-contained breathing apparatus (SCBA). |
| Small spills/leaks | Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Apply water spray or mist to knock down vapors. 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. Water spill: Use natural barriers or oil spill control booms to limit spill travel. Remove trapped material with suction hoses. |
| Disposal code | 4 |
| Stability | Stable only if stored and handled under recommended conditions. The stability of the product depends upon the availability of both dissolved oxygen and MEHQ inhibitor(CAS=150-76-5). The presence of oxygen is necessary for the MEHQ to function effectively. The product should never be stored under an inert gas atmosphere, but should always be stored under an atmosphere containing 5-21% oxygen by volume. |
| Incompatibilities | Strong oxidizing agents and hydrochloric acid. |
| Decomposition | When heated to decomposition, it emits acrid smoke and irritating fumes. |
| Fire. | ||||
| Flash Point,°C | 76 | |||
| Autoignition, °C | 370 | |||
| Upper exp. limit, % | 8.7 | |||
| Lower exp. limit, % | 1.6 | |||
| Fire fighting | Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use dry chemical, dry sand, or carbon dioxide. Do not use water on material itself. If large quantities of combustibles are involved, use water in flooding quantities as spray and fog. Use water spray to knock-down vapors. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. | |||
| Fire potential | Combustible liquid and vapor. | |||
| Hazards | When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards. May polymerize explosively when heated or involved in a fire. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form. | |||
| Combustion products | Vapor forms explosive mixtures with air. | |||
| NFPA | Health | 3 | ||
| Flammability | 2 | |||
| Reactivity | 2 | |||
| Health. | |
| Exposure limit(s) | TLV: 20 ppm; 70 mg/m3 (ACGIH 1995-1996). NIOSH REL: TWA 20 ppm (70 mg/m3) skin |
| Poison_Class | 2 |
| Exposure effects | No data were available to assess the possible reproductive hazard of this agent. However, methacrylic acid has been shown to be teratogenic in the rat. <br>No data were available to assess the teratogenic potential of this agent. <br>No data were available to assess the potential effects of exposure to this agent during pregnancy or lactation. |
| Ingestion | May cause burns to the digestive tract. May be harmful if swallowed, |
| Inhalation | Causes chemical burns to the respiratory tract. |
| Skin | Harmful if absorbed through the skin. Causes skin burns. |
| Eyes | Causes eye burns. |
First aid |
|
| Ingestion | DO NOT INDUCE VOMITING. Corrosive chemicals will destroy the membranes of the mouth, throat, and esophagus and, in addition, have a high risk of being aspirated into the victim's lungs during vomiting which increases the medical problems. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. IMMEDIATELY transport the victim to a hospital. If the victim is convulsing or unconscious, do not give anything by mouth, ensure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. Transport the victim IMMEDIATELY to a hospital. |
| Inhalation | IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. IMMEDIATELY call a physician and be prepared to transport the victim to a hospital even if no symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used. |
| Skin | IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. IMMEDIATELY call a hospital or poison control center even if no symptoms (such as redness or irritation) develop. IMMEDIATELY transport the victim to a hospital for treatment after washing the affected areas. |
| Eyes | First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop. |
| Transport. | ||
| UN number | 2531 | |
| Response guide | 153 | |
| Hazard class | 8 | |
| Packing Group | II | |
| USCG CHRIS Code | MAD | |
| USCG Compatatibility Group | 4 Organic acids | |
| HS Code | 2916 13 00 | |
| Std. Transport # | 4930251 | |
| IMO Chemical Code | 17 | |
| IMO Pollution Category | D | |
| IMO Hazard code | S | |