Label abbreviations descriptions

TRIMELLITIC ANHYDRIDE

Chemical Identification
CAS # 552-30-7
Formula

C₉H₄O₅
Synonyms

1,2,4-benzenetricarboxylic anhydride; 4-carboxyphthalic anhydride; TMA; TMAN; trimellic acid anhydride

Physical Properties
Physical description Colorless solid as crystals or off-white flakes.
Boiling point 464-473°F at 14 mmHg Molecular weight 192.13
Freezing point/melting point 329-336°F Vapor pressure 0.000004 mmHg
Flash point 440.6°F Vapor density 6.6
Specific gravity 1.55 at 68°F Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 2502
Sampling group
Sampler/Sampling media GFFs coated with veratrylamine (3,4-dimethoxybenzylamine) and di-n-octyl phthalate [SLTC100]
Sampling time*

240 min
Sampling volume (TWA)*

480 L
Sampling flow rate (TWA)*

2 L/min
Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments HPLC
Method reference OSHA 98 (fully validated)
Notes

Store filters under refrigeration and use within 1 month. Small interfering peaks start appearing after that time. Collect sample open-face.
Special requirements

These media are prepared by SLTC as needed and are not available for immediate shipment. Please allow time for SLTC to prepare these media prior to sampling.

* 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

0.005 ppm (0.04 mg/m³)

 TLV-TWA

0.0005 mg/m³ (inhalable fraction and vapor) [2007]

 PEL-TWA
PEL-STEL REL-STEL TLV-STEL

0.002 mg/m³ (inhalable fraction and vapor) [2007]

 PEL-STEL
PEL-C REL-C TLV-C PEL-C

0.005 ppm (0.04 mg/m³)
Skin notation

NA

 Skin notation

N

 Skin notation

Y

 Skin notation

N
Notes:

Not established

 Notes:

Should be handled in the workplace as an extremely toxic substance.

 Notes:

dermal sensitization (DSEN), respiratory sensitization (RSEN)

 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 : 01/22/2021