CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Malathion is a yellow to dark-brown liquid with a skunk-like odor. Sinks in water. Freezing point is 37 °F. (USCG, 1999) |
|---|---|
| Color/Form | Colorless or slightly yellow |
| Odor | Skunk-like odor |
| Boiling Point | 313 to 315 °F at 0.7 mmHg (decomposes) (NTP, 1992) |
| Melting Point | 37.1 °F (NTP, 1992) |
| Flash Point | greater than 325 °F (NTP, 1992) |
| Solubility | less than 1 mg/mL at 70.7 °F (NTP, 1992) |
| Density | 1.234 at 77 °F (USCG, 1999) - Denser than water; will sink |
| Vapor Density | Relative vapor density (air = 1): 11.4 |
| Vapor Pressure | 4e-05 mmHg at 86 °F (NTP, 1992) |
| LogP | 2.36 |
| Henry's Law Constant | Henry's Law constant = 4.89X10-9 atm cu-m/mole at 25 °C |
| Stability/Shelf Life | Stable under recommended storage conditions. |
| Decomposition | Hazardous decomposition products formed under fire conditions - Carbon oxides, sulfur oxides, oxides of phosphorus |
| Corrosivity | Corrosive to iron and some other metals |
| Surface Tension | 37.1 dynes/cm at 24 °C |
| Odor Threshold | 1.00 ppm (detection in water, purity not stated) |
| Refractive Index | Index of refraction: 1.4985 at 25 °C/D |
| Collision Cross Section | 165.9 Ų [M+H]+ [CCS Type: TW, Method: Major Mix IMS/Tof Calibration Kit (Waters)] |
| Kovats Retention Index | 1919 1919 1946 1931 1934 1926 1938 1930 1917 1920 1922 1945.3 1928 1928 1937.6 1928.4 1924.7 1913 1938.9 1930 1930 1917 1938.7 1920 1917 1931.7 1942.8 1932.2 |
| Other Experimental Properties | Specific gravity: 1.23 at 25 °C/4 °C |
| Chemical Classes | Pesticides -> Organophosphate Insecticides |
SAFETY INFORMATION
| Signal word | Warning |
|---|---|
| Pictogram(s) |
 Exclamation Mark Irritant GHS07  Environment GHS09 |
| GHS Hazard Statements |
H302:Acute toxicity,oral H317:Sensitisation, Skin H410:Hazardous to the aquatic environment, long-term hazard |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P302+P352:IF ON SKIN: wash with plenty of soap and water. |
COMPUTED DESCRIPTORS
| Molecular Weight | 330.4 g/mol |
|---|---|
| XLogP3 | 2.4 |
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 8 |
| Rotatable Bond Count | 11 |
| Exact Mass | 330.03606767 g/mol |
| Monoisotopic Mass | 330.03606767 g/mol |
| Topological Polar Surface Area | 128 Ų |
| Heavy Atom Count | 19 |
| Formal Charge | 0 |
| Complexity | 341 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 1 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Malathion is an insecticide that does not occur naturally. Pure malathion is a colorless liquid, and technical-grade malathion, which contains >90% malathion and impurities in a solvent, is a brownish-yellow liquid that smells like garlic. Malathion is used to kill insects on farm crops and in gardens, to treat lice on humans, and to treat fleas on pets. Malathion is also used to kill mosquitos and Mediterranean fruit flies on (medflies) in large outdoor areas.