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Crag® herbicide (total dust)

General Description

  • Synonyms: Sesone; Sodium 2,4-dichlorophenoxyethyl sulphate; 2-(2,4-Dichlorophenoxy)ethyl sodium sulfate; Disul-sodium; Sodium 2,4-Dichlorophenyl Cellosolve Sulfate; Ethanol, 2- (2,4-dichlorophenoxy), hydrogen sulfate, sodium salt
  • OSHA IMIS Code Number: 0737
  • Chemical Abstracts Service (CAS) Registry Number: 136-78-7
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: KK4900000
  • NIOSH Pocket Guide to Chemical Hazards, Crag® herbicide: chemical description, physical properties, potentially hazardous incompatibilities, and more

Exposure Limits

  • OSHA Permissible Exposure Limit (PEL):
  • American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 10 mg/m3 TWA; Appendix A4 - Not Classifiable as a Human Carcinogen (TLV listed under Sesone)
  • National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 mg/m3 TWA

Health Factors

NIOSH Immediately Dangerous To Life or Health Concentration (IDLH): 500 mg/m3

Potential Symptoms: Irritation of eyes, skin, respiratory tract; cough, sore throat; liver, kidney damage; in animals: CNS effects, convulsions; INGES. ACUTE: Burning sensation

Health Effects: Cumulative liver damage (HE3); LD50 (oral, rat) 480-730 mg/kg

Affected Organs: Eyes, skin, CNS, liver, kidneys


  1. Crag herbicide is metabolized in the body to 2,4-dichlorophenoxyacetic acid (2,4-D), a member of the chlorophenoxy herbicide group.

Date Last Revised: 09/19/2005

Literature Basis:

  • NIOSH Pocket Guide to Chemical Hazards: Crag® herbicide.
  • International Chemical Safety Cards (WHO/IPCS/ILO): Disul-sodium.
  • Bradberry, S.M., Proudfoot, A.T. and Vale, J.A.: Poisoning due to chlorophenoxy herbicides. Toxicol. Rev. 23(2): 65-73, 2004.
  • Pohanish, R.P. (editor): 2,4-DES-Sodium. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 756-758.

Monitoring Methods used by OSHA

Laboratory Sampling/Analytical Method:
  • Mixed Cellulose Ester Filter (MCEF) 0.8 microns
  • maximum volume: 90 Liters
  • maximum flow rate: 1.5 L/min
  • current analytical method: Colorimetric
  • method reference: NIOSH Analytical Method (NIOSH S-356)
  • method classification: Fully Validated

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