OXALIC ACID†

Chemical Identification
CAS # 144-62-7
Formula

C₂H₂O₄

Synonyms

ethanedioic acid; oxalic acid (aqueous); oxalic acid dihydrate

Physical Properties
Physical description Colorless, odorless powder or granular solid.
Boiling point sublimes Molecular weight 90.04
Freezing point/melting point 372°F Vapor pressure <0.001 mmHg
Flash point Vapor density 4.3
Specific gravity 1.90 Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating 3 NFPA fire rating 1
NFPA reactivity rating 0 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 1970
Sampling group
Sampler/Sampling media GFF (37 mm), Type A/B [SKC 225-701]
Sampling time*

100 min

Sampling volume (TWA)*

100 L

Sampling flow rate (TWA)*

1 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments IC
Method reference OSHA PV2115 (partially validated)
Notes

Sample open-faced!!

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.

Wipe Method
Sampler/Sampling media
Bulk Method
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
 

1 mg/m³

REL-TWA
 

1 mg/m³

TLV-TWA
 

1 mg/m³ [2014]

PEL-TWA
 

1 mg/m³

PEL-STEL
 

 

REL-STEL
 

2 mg/m³

TLV-STEL
 

2 mg/m³ [2014]

PEL-STEL
 

2 mg/m³

PEL-C
 

 

REL-C
 

 

TLV-C
 

 

PEL-C
 

 

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Notes:
 

See 29 CFR 1910.1000 Table Z-1.

Notes:
 

 

Notes:
 

 

Notes:
 

 

Health factors:  See NIH-NLM PubChem. IDLH
 

500 mg/m³

Carcinogenic classifications: Not listed Notes:
 

 

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

 

Last Updated Date : 01/28/2021