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2,4-D																				Related Pages
Synonyms & Trade Names
			Dichlorophenoxyacetic acid, 2,4-Dichlorophenoxyacetic acid
CAS No.
			94-75-7
	RTECS No.
			AG6825000
	DOT ID & Guide
			2765 152

FormulaCl2C6H3OCH2COOH
	Conversion
	IDLH
			100 mg/m3See: 94757

Exposure Limits
			NIOSH RELTWA 10 mg/m3OSHA PEL TWA 10 mg/m3
	Measurement Methods
			**NIOSH** 5001
					
					See: NMAM or OSHA Methods
										
Physical Description
			White to yellow, crystalline, odorless powder.
					[herbicide]													
										
Molecular Weight221.0	
	Boiling PointDecomposes
	Melting Point280°F
	Solubility0.05%
	Vapor Pressure(320°F): 0.4 mmHg
	Ionization Potential?											
Specific Gravity1.57	
	Flash PointNA
	Upper Explosive LimitNA
	Lower Explosive LimitNA
Noncombustible Solid, but may be dissolved in flammable liquids.
Incompatibilities & Reactivities
			Strong oxidizers
Exposure Routes
			inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
			lassitude (weakness, exhaustion), stupor, hyporeflexia, muscle twitching; convulsions; dermatitis; In Animals: liver, kidney injury
Target Organs
			Skin, central nervous system, liver, kidneys
										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Prevent skin contact
							**Eyes:**Prevent eye contact
							**Wash skin:**When contaminated
							**Remove:**When wet or contaminated
							**Change:**Daily
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Soap wash promptly
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately
Respirator Recommendations
			**NIOSH/OSHA****Up to 100 mg/m3**: (APF = 10) Any air-purifying half-mask respirator with organic vapor cartridge(s) in combination with an N95, R95, or P95 filter. The following filters may also be used: N99, R99, P99, N100, R100, P100. Click here for information on selection of N, R, or P filters.(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters.(APF = 25) Any powered, air-purifying respirator with an organic vapor cartridge in combination with a high-efficiency particulate filter.(APF = 10) Any supplied-air respirator(APF = 50) Any self-contained breathing apparatus with a full facepiece**Emergency or planned entry into unknown concentrations or IDLH conditions:** (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus**Escape:** (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters.Any appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0033
					  MEDICAL TESTS: 0248

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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