METHACRYLIC ACID
Chemical Identification | |
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CAS # | 79-41-4 |
Formula |
C₄H₆O₂ |
Synonyms |
methacrylic acid (glacial); methacrylic acid (inhibited); α-methacrylic acid; 2-methylacrylic acid; 2-methylpropenoic acid |
Physical Properties | |||
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Physical description | Colorless liquid or solid (below 61°F) with an acrid, repulsive odor. | ||
Boiling point | 325°F | Molecular weight | 86.09 |
Freezing point/melting point | 61°F | Vapor pressure | 0.7 mmHg |
Flash point | 171°F (open-cup) | Vapor density | 2.97 |
Specific gravity | 1.015 at 68°F | Ionization potential | |
Lower explosive limit (LEL) | Upper explosive limit (UEL) | 2.4% | |
NFPA health rating | 3 | NFPA fire rating | 2 |
NFPA reactivity rating | 2 | NFPA special instruction | |
Vapor hazard ratio (VHR) | |||
Historical exceedance percentage | |||
Target organs |
Monitoring Methods Used by OSHA | ||||||
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Analyte code (IMIS no.) | M339 | |||||
Sampling group | ||||||
Sampler/Sampling media | 2 Anasorb 708 tubes in series [SKC 226-30-08] | |||||
Sampling time* | 240 min |
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Sampling volume (TWA)* | 24 L |
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Sampling flow rate (TWA)* | 0.1 L/min |
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Sampling volume (STEL/Peak/C)* |
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Sampling flow rate (STEL/Peak/C)* |
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Analytical method instruments | HPLC | |||||
Method reference | OSHA PV2005 (partially validated) | |||||
Notes |
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Special requirements |
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* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.
Wipe Method | |
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Sampler/Sampling media |
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Bulk Method |
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On-Site Screening Techniques | ||||||
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Device | ||||||
Model/Type | ||||||
Sampling information (see manufacturer instructions) |
Exposure Limits | |||||||
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OSHA PEL
8-hour TWA (ST) STEL (C) Ceiling Peak |
NIOSH REL
Up to 10-hour TWA (ST) STEL (C) Ceiling |
ACGIH TLV©
8-hour TWA (ST) STEL (C) Ceiling |
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PEL-TWA |
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REL-TWA |
20 ppm (70 mg/m³) |
TLV-TWA |
20 ppm [1992] |
PEL-TWA |
20 ppm (70 mg/m³) |
PEL-STEL |
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REL-STEL |
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TLV-STEL |
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PEL-STEL |
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PEL-C |
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REL-C |
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TLV-C |
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PEL-C |
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Skin notation |
NA |
Skin notation |
Y |
Skin notation |
N |
Skin notation |
Y |
Notes:
Not established |
Notes:
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Notes:
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Notes:
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Health factors: See NIH-NLM PubChem. | IDLH | ||||||
Carcinogenic classifications: Not listed |
Notes:
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AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
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Additional Resources and Literature References |
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NOAA: CAMEO Chemicals - Methacrylic acid NIOSH: Pocket Guide to Chemical Hazards - Methacrylic acid Literature References
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Last Updated Date : 01/29/2021