Label abbreviations descriptions

HYDROGEN CHLORIDE†

Chemical Identification
CAS # 7647-01-0
Formula

HCl
Synonyms

anhydrous hydrogen chloride; aqueous hydrogen chloride; hydrochloric acid; muriatic acid

Physical Properties
Physical description Colorless to slightly yellow gas with a pungent, irritating odor.
Boiling point -121°F Molecular weight 36.5
Freezing point/melting point -174°F Vapor pressure 40.5 atm
Flash point Vapor density 1.27
Specific gravity Ionization potential 12.74 eV
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating 3 NFPA fire rating 0
NFPA reactivity rating 1 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 1430
Sampling group
Sampler/Sampling media ORBO™ 53 activated silica gel tube [Supelco 20265]
Sampling time*

15 min
Sampling volume (TWA)*
 

 
Sampling flow rate (TWA)*
 

 
Sampling volume (STEL/Peak/C)*

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

0.5 L/min
Analytical method instruments IC
Method reference OSHA ID-174SG (partially validated)
Notes
 

Submit as a separate sample, however, hydrogen bromide can be analyzed from the same sample. The sample is analyzed for chloride (or bromide, if requested) and the result reported as the acid. Make sure that the glass fiber filter plug is firmly in contact with the silica gel before and after sampling. Report the presence of chloride (or bromide) salts to the analytical laboratory.
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 Whatman smear tab. [WHA1450993]
Bulk Method
 

 

On-Site Screening Techniques
Device Detector tube Detector tube CMS Chip CMS Chip
Model/Type Gastec 14L Matheson-Kitagawa 8014-173SB Hydrochloric acid, 1-25 ppm range Hydrochloric acid, 20-500 ppm range
Sampling information
(see manufacturer instructions) 		0.5-5 strokes, 0.05-76 ppm range, uncertainty 16.4% for 1-5 ppm, 8.2% for 5-20 ppm follow mfr instructions, 0.4-40 ppm range FES0000887

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
 

 

 TLV-TWA
 

 

 PEL-TWA
 

0.3 ppm (0.45 mg/m³)
PEL-STEL
 

 

 REL-STEL
 

 

 TLV-STEL
 

 

 PEL-STEL
 

 
PEL-C
 

5 ppm (7 mg/m³)

 REL-C
 

5 ppm (7 mg/m³)

 TLV-C
 

2 ppm [2000]

 PEL-C
 

2 ppm
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
 

50 ppm
Carcinogenic classifications: IARC-3, TLV-A4 Notes:
 

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

3 ppm/20 ppm/150 ppm

Additional Resources and Literature References

Last Updated Date : 03/25/2024