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Methacrylic acid																				Related Pages
Synonyms & Trade Names
			α-Methacrylic acid, Methacrylic acid (glacial), Methacrylic acid (inhibited), 2-Methylacrylic acid, 2-Methylpropenoic acid
CAS No.
			79-41-4
	RTECS No.
			OZ2975000
	DOT ID & Guide
			2531 153P(inhibited)

FormulaCH2=C(CH3)COOH
	Conversion
			1 ppm = 3.52 mg/m3
	IDLH
			N.D.See: IDLH INDEX

Exposure Limits
			NIOSH RELTWA 20 ppm (70 mg/m3) [skin]
					OSHA PEL none See Appendix G
	Measurement Methods
			**OSHA** PV2005
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless liquid or solid (below 61°F) with an acrid, repulsive odor.													
										
Molecular Weight86.1	
	Boiling Point325°F
	Freezing Point61°F
	Solubility(77°F): 9%
	Vapor Pressure0.7 mmHg
	Ionization Potential?											
Specific Gravity1.02 (Liquid)	
	Flash Point(oc) 171°F
	Upper Explosive Limit?
	Lower Explosive Limit?
Class IIIA Combustible Liquid: Fl.P. at or above 140°F and below 200°F.
Incompatibilities & Reactivities
			Oxidizers, elevated temperatures, hydrochloric acid
					[Note: Typically contains 100 ppm of the monomethyl ether of hydroquinone to prevent polymerization.]
Exposure Routes
			inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
			irritation eyes, skin, mucous membrane; eye, skin burns
Target Organs
			Eyes, skin, respiratory system
										
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:**Water flush immediately
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately
Respirator Recommendations
			Not available.
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0917

			
							

			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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Chemical Names, Synonyms and Trade Names
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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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