PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Oxalic acid, anhydrous; (Ethanedioic acid) | 144-62-7 | 8027 |
14.01
4.01
11.01
14.02
4.08
4.05
7.01
7.00
11.00
4.02
|
|||||||||
| Formula | Synonyms | |||||||||||
| C2H2O4 | OXALIC ACID, AKTISAL, AQUISAL, ETHANEDIOIC ACID, ETHANEDIONIC ACID, NCI-55209, OXALIC ACID (AQUEOUS), OXALIC ACID DIHYDRATE | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 90.04 | S | 0.54 | 105 | 1.9 @ 17°C |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 2.0 | 83 | 500 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.54 | 23 | 140 |
Technical Basis
A review of available sources identified the following exposure limits: an IDLH (1990/1994) and TLV-STEL.
Data sources were selected according to the hierarchy listed in Table 3.1, which resulted in the TLV-STEL for the TEEL-1 basis and the IDLH for the TEEL-3 basis. There was no change in the IDLH value between the original (1990) and revised values (1994). The TEEL-2 value was calculated according to Table 3.5.
• TEEL-1 = TLV-STEL (2 mg/m3)
• TEEL-2 = TEEL-3/6
• TEEL-3 = IDLH (1990/1994, 500 mg/m3)
This review generated TEEL-1 and TEEL-3 values that are consistent with Rev. 29A. In Rev. 29, the TEEL-2 basis was a rat intraperitoneal TDLo, which was not found during current research.
Data sources were selected according to the hierarchy listed in Table 3.1, which resulted in the TLV-STEL for the TEEL-1 basis and the IDLH for the TEEL-3 basis. There was no change in the IDLH value between the original (1990) and revised values (1994). The TEEL-2 value was calculated according to Table 3.5.
• TEEL-1 = TLV-STEL (2 mg/m3)
• TEEL-2 = TEEL-3/6
• TEEL-3 = IDLH (1990/1994, 500 mg/m3)
This review generated TEEL-1 and TEEL-3 values that are consistent with Rev. 29A. In Rev. 29, the TEEL-2 basis was a rat intraperitoneal TDLo, which was not found during current research.
References
https://www.cdc.gov/niosh/idlh/144627.html
https://www.acgih.org/oxalic-acid-anhydrous-and-dihydrate/