Label abbreviations descriptions

PHOSPHORIC ACID†

Chemical Identification
CAS # 7664-38-2
Formula
 

H₃PO₄
Synonyms
 

white phosphoric acid; orthophosphoric acid; metaphosphoric acid

Physical Properties
Physical description Thick, colorless, odorless, crystalline solid.
Boiling point 415°F Molecular weight 98
Freezing point/melting point 108°F Vapor pressure 0.03 mmHg
Flash point Vapor density
Specific gravity 1.87 (pure) 1.33 (50% solution) Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating 3 NFPA fire rating 0
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.) 2085
Sampling group
Sampler/Sampling media Mixed cellulose ester filter (MCEF) 0.8 micron (37 mm) and filter spacer with Na₂CO₃ impregnated backup pad, in a 3-piece cassette [SKC 225-9001]
Sampling time*
 

480 min
Sampling volume (TWA)*
 

960 L
Sampling flow rate (TWA)*
 

2 L/min
Sampling volume (STEL/Peak/C)*
 

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

2 L/min
Analytical method instruments IC
Method reference OSHA ID-111 (partially validated)
Notes
 

If the filter is not overloaded, samples may be collected up to an 8-hour period. Within 1 hour after sampling, transfer the filter to a clean screw cap vial. Phosphoric and sulfuric acid may be submitted on the same filter; otherwise, submit as a separate filter. Large quantities of any one of the analytes can result in masking of the peaks of other analytes.
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
 

Wipe with mixed cellulose ester filter (MCEF) 0.8 micron (37 mm). [AAWP03700]
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 [1992]

 PEL-TWA
 

1 mg/m³
PEL-STEL
 

 

 REL-STEL
 

3 mg/m³

 TLV-STEL
 

3 mg/m³ [1992]

 PEL-STEL
 

3 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
 

1000 mg/m³
Carcinogenic classifications: Not listed Notes:
 

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

3 mg/m³/30 mg/m³/150 mg/m³

Additional Resources and Literature References

Last Updated Date : 01/08/2021