Label abbreviations descriptions

METHYL ETHYL KETONE PEROXIDE

Chemical Identification
CAS # 1338-23-4
Formula

C₈H₁₆O₄
Synonyms

2-butanone peroxide, MEKP, MEK peroxide

Physical Properties
Physical description Colorless liquid with a characteristic odor.
Boiling point 244°F (decomposes) Molecular weight 176.2
Freezing point/melting point Vapor pressure
Flash point 125-200°F for 60% MEKP (open cup) Vapor density
Specific gravity 1.12 Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
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
Analyte code (IMIS no.) 1750
Sampling group
Sampler/Sampling media XAD-4 tube (80/40 mg) [SKC 226-93]
Sampling time*

15 min
Sampling volume (TWA)*
Sampling flow rate (TWA)*
Sampling volume (STEL/Peak/C)*
 

15 L
Sampling flow rate (STEL/Peak/C)*
 

1 L/min
Analytical method instruments GC-FID
Method reference OSHA 77 (fully validated)
Notes
 

Samples must be frozen immediately after collection. Ship frozen overnight and keep frozen until analysis.
Special requirements
 

 

* 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.

Bulk/Wipe Method
Wipe Sampler/Sampling media
 

 
Bulk Method
 

 

On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)

Exposure Limits
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
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 

 

 REL-TWA
 

 

 TLV-TWA
 

 

 PEL-TWA
 

 
PEL-STEL
 

 

 REL-STEL
 

 

 TLV-STEL
 

 

 PEL-STEL
 

 
PEL-C
 

 

 REL-C
 

0.2 ppm (1.5 mg/m³)

 TLV-C
 

0.2 ppm [1992]

 PEL-C
 

0.2 ppm (1.5 mg/m³)
Skin notation
 

NA

 Skin notation
 

N

 Skin notation
 

N

 Skin notation
 

N
Notes:
 

Not established

 Notes:
 

 

 Notes:
 

 

 Notes:
 

 
Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: Not listed Notes:
 

 
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 

 

Additional Resources and Literature References

Last Updated Date : 01/05/2021