HYDROQUINONE (DIHYDROXYBENZENE)†
Chemical Identification | |
---|---|
CAS # | 123-31-9 |
Formula |
C₆H₆O₂ |
Synonyms |
p-benzenediol; 1,4-benzenediol; dihydroxybenzene; 1,4-dihydroxybenzene; quinol |
Physical Properties | |||
---|---|---|---|
Physical description | Light-tan, light-gray, or colorless crystals. | ||
Boiling point | 545°F | Molecular weight | 110.11 |
Freezing point/melting point | 338°F | Vapor pressure | 4 mmHg at 302°F |
Flash point | 329°F | Vapor density | 3.81 |
Specific gravity | 1.332 at 59°F | Ionization potential | 7.95 eV |
Lower explosive limit (LEL) | Upper explosive limit (UEL) | ||
NFPA health rating | 2 | 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.) | 1490 | |||||
Sampling group | ||||||
Sampler/Sampling media | XAD-7 (80/40 mg sections, 20/60 mesh) coated with 10% phosphoric acid [SKC 226-98] | |||||
Sampling time* | 100 min |
|||||
Sampling volume (TWA)* | 20 L |
|||||
Sampling flow rate (TWA)* | 0.2 L/min |
|||||
Sampling volume (STEL/Peak/C)* |
|
|||||
Sampling flow rate (STEL/Peak/C)* |
|
|||||
Analytical method instruments | HPLC | |||||
Method reference | OSHA PV2094 (partially validated) | |||||
Notes |
|
|||||
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 |
---|
|
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 |
|||||
PEL-TWA |
2 mg/m³ |
REL-TWA |
|
TLV-TWA |
1 mg/m³ [2007] |
PEL-TWA |
2 mg/m³ |
PEL-STEL |
|
REL-STEL |
|
TLV-STEL |
|
PEL-STEL |
|
PEL-C |
|
REL-C |
2 mg/m³ [15 minutes] |
TLV-C |
|
PEL-C |
|
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Notes: |
Notes:
|
Notes:
dermal sensitizer (DSEN) |
Notes:
|
||||
Health factors: See NIH-NLM PubChem. | IDLH |
50 mg/m³ |
|||||
Carcinogenic classifications: IARC-3, TLV-A3 |
Notes:
|
||||||
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
|
Additional Resources and Literature References |
---|
NOAA: CAMEO Chemicals - Hydroquinone NIOSH: Pocket Guide to Chemical Hazards - Hydroquinone Literature References
|
Last Updated Date : 12/31/2020