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Parathion																				Related Pages
Synonyms & Trade Names
			O,O-Diethyl-O(p-nitrophenyl) phosphorothioate, Diethyl parathion, Ethyl parathion, Parathion-ethyl
CAS No.
			56-38-2
	RTECS No.
			TF4550000
	DOT ID & Guide
			2783 152

Formula(C2H5O)2P(S)OC6H4NO2
	Conversion
	IDLH
			10 mg/m3See: 56382

Exposure Limits
			NIOSH RELTWA 0.05 mg/m3 [skin]
					OSHA PEL TWA 0.1 mg/m3 [skin]
	Measurement Methods
			**NIOSH** 5600;**OSHA** 62
					
					See: NMAM or OSHA Methods
										
Physical Description
			Pale-yellow to dark-brown liquid with a garlic-like odor.
					[Note: A solid below 43°F. Pesticide that may be absorbed on a dry carrier.]													
										
Molecular Weight291.3	
	Boiling Point707°F
	Freezing Point43°F
	Solubility0.001%
	Vapor Pressure0.00004 mmHg
	Ionization Potential?											
Specific Gravity1.27	
	Flash Point(oc) 392°F
	Upper Explosive Limit?
	Lower Explosive Limit?
Class IIIB Combustible Liquid: Fl.P. at or above 200°F.
Incompatibilities & Reactivities
			Strong oxidizers, alkaline materials
Exposure Routes
			inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
			irritation eyes, skin, respiratory system; miosis; rhinorrhea (discharge of thin nasal mucus); headache; chest tightness, wheezing, laryngeal spasm, salivation, cyanosis; anorexia, nausea, vomiting, abdominal cramps, diarrhea; sweating; muscle fasciculation, lassitude (weakness, exhaustion), paralysis; dizziness, confusion, ataxia; convulsions, coma; low blood pressure; cardiac irreg
Target Organs
			Eyes, skin, respiratory system, central nervous system, cardiovascular system, blood cholinesterase
										
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
							**Provide:**Eyewash, Quick drench
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Soap wash immediately
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately
Respirator Recommendations
			**NIOSH****Up to 0.5 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 = 10) Any supplied-air respirator**Up to 1.25 mg/m3**: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode(APF = 25) Any powered, air-purifying respirator with an organic vapor cartridge in combination with a high-efficiency particulate filter.**Up to 2.5 mg/m3**: (APF = 50) Any air-purifying full-facepiece respirator equipped with organic vapor cartridge(s) in combination with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters.(APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode(APF = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and organic vapor cartridge(s) in combination with a high-efficiency particulate filter(APF = 50) Any self-contained breathing apparatus with a full facepiece(APF = 50) Any supplied-air respirator with a full facepiece**Up to 10 mg/m3**: (APF = 1000) Any supplied-air respirator operated in a pressure-demand or other positive-pressure mode**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: 0006
					  MEDICAL TESTS: 0174

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
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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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