CAS No.50-29-3 p,p'-DDT


Name p,p'-DDT
CAS Registry Number 50-29-3
Molecular Structure p,p'-DDT   50-29-3
Molecular Formula C14H9Cl5
Molecular Weight
Hazard Codes: Details
Risk Statements: 36/37/38
Safety Statements: 26-36-24/25
HS Code: 29163900

CAS 50-29-3 Wiki / 50-29-3 MSDS

Chemical structure of DDT
Preferred IUPAC name
CAS Number
  • 50-29-3 YesY
3D model (JSmol)
  • Interactive image
  • CHEBI:16130 YesY
  • 2928 YesY
ECHA InfoCard 100.000.023
  • D07367 YesY
PubChem CID
  • 3036
  • CIW5S16655 YesY
Chemical formula
Molar mass 354.48 g·mol−1
Density 0.99 g/cm3
Melting point 108.5 °C (227.3 °F; 381.6 K)
Boiling point 260 °C (500 °F; 533 K) (decomposes)
Solubility in water
25 μg/L (25 °C)[1]
Main hazards Toxic, dangerous to the environment, likely carcinogenic
EU classification (DSD) (outdated)
Toxic T Dangerous for the Environment (Nature) N
R-phrases (outdated) R25 R40 R48/25 R50/53
S-phrases (outdated) (S1/2) S22 S36/37 S45 S60 S61
NFPA 704
Flammability code 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g., diesel fuelHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
Flash point 72–77 °C; 162–171 °F; 345–350 K [3]
Lethal dose or concentration (LD, LC):
LD50 (median dose)
113–800 mg/kg (rat, oral)[1]
250 mg/kg (rabbit, oral)
135 mg/kg (mouse, oral)
150 mg/kg (guinea pig, oral)[2]
US health exposure limits (NIOSH):[4]
PEL (Permissible)
TWA 1 mg/m3 [skin]
REL (Recommended)
Ca TWA 0.5 mg/m3
IDLH (Immediate danger)
500 mg/m3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Dichlorodiphenyltrichloroethane (DDT) is a colorless, tasteless, and almost odorless crystalline organochlorine known for its insecticidal properties and environmental impacts. First synthesized in 1874, DDT's insecticidal action was discovered by the Swiss chemist Paul Hermann Müller in 1939. DDT was used in the second half of World War II to control malaria and typhus among civilians and troops. Müller was awarded the Nobel Prize in Physiology or Medicine "for his discovery of the high efficiency of DDT as a contact poison against several arthropods" in 1948.[5]

By October 1945, DDT was available for public sale in the United States. Although it was promoted by government and industry for use as an agricultural and household pesticide, there were also concerns about its use from the beginning.[6] Opposition to DDT was focused by the 1962 publication of Rachel Carson's book Silent Spring. It cataloged environmental impacts that coincided with widespread use of DDT in agriculture in the United States, and it questioned the logic of broadcasting potentially dangerous chemicals into the environment with little prior investigation of their environment and health effects. The book claimed that DDT and other pesticides had been shown to cause cancer and that their agricultural use was a threat to wildlife, particularly birds. Its publication was a seminal event for the environmental movement and resulted in a large public outcry that eventually led, in 1972, to a ban on DDT's agricultural use in the United States.[7] A worldwide ban on agricultural use was formalized under the Stockholm Convention on Persistent Organic Pollutants, but its limited and still-controversial use in disease vector control continues,[8][9] because of its effectiveness in reducing malarial infections, balanced by environmental and other health concerns.

Along with the passage of the Endangered Species Act, the United States ban on DDT is a major factor in the comeback of the bald eagle (the national bird of the United States) and the peregrine falcon from near-extinction in the contiguous United States.[10][11]