Lapse in Appropriations
For workplace safety and health, please call 800-321-6742; for mine safety and health, please call 800-746-1553; for Job Corps, please call 800-733-5627 and for Wage and Hour, please call 866-487-9243 (866-4-US-WAGE). This website is currently not being updated due to the suspension of Federal government services. The last update to the site was 10/1/2025. Updates to the site will start again when the Federal government resumes operations.
TRIMELLITIC ANHYDRIDE
| CAS # | 552-30-7 |
|---|---|
| Formula |
C₉H₄O₅ |
| Synonyms |
1,2,4-benzenetricarboxylic anhydride; 4-carboxyphthalic anhydride; TMA; TMAN; trimellic acid anhydride |
| 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 | |||
| 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.
| Wipe Sampler/Sampling media | |
|---|---|
| Bulk Method |
| Device | |||||
|---|---|---|---|---|---|
| Model/Type | |||||
|
Sampling information (see manufacturer instructions) |
|
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 |
|||||
|---|---|---|---|---|---|---|---|
| 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
|
NOAA: CAMEO Chemicals - Trimellitic anhydride NIOSH: Pocket Guide to Chemical Hazards - Trimellitic anhydride Literature References
|
Last Updated Date : 01/22/2021