Hydroquinone |
Synonyms & Trade Names p-Benzenediol; 1,4-Benzenediol; Dihydroxybenzene; 1,4-Dihydroxybenzene; Quinol |
CAS No. 123-31-9 |
RTECS No. MX3500000 |
DOT ID & Guide 2662 153 |
FormulaC6H4(OH)2 |
Conversion |
IDLH 50 mg/m3
See: 123319 |
Exposure Limits NIOSH REL: C 2 mg/m3 [15-minute]
OSHA PEL: TWA 2 mg/m3 |
Measurement Methods
NIOSH 5004;
OSHA PV2094
See: NMAM or OSHA Methods |
Physical Description Light-tan, light-gray, or colorless crystals. |
MW: 110.1 |
BP: 545°F |
MLT: 338°F |
Sol: 7% |
VP: 0.00001 mmHg |
IP: 7.95 eV |
Sp.Gr: 1.33 |
Fl.P: 329°F (Molten) |
UEL: ? |
LEL: ? |
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| Combustible Solid; dust cloud may explode if ignited in an enclosed area. |
Incompatibilities & Reactivities Strong oxidizers, alkalis |
Exposure Routes inhalation, ingestion, skin and/or eye contact |
Symptoms irritation eyes: conjunctivitis; keratitis (inflammation of the cornea); central nervous system excitement; colored urine, nausea, dizziness, suffocation, rapid breath; muscle twitching, delirium; collapse; skin irritation, sensitization, dermatitis |
Target Organs Eyes, skin, respiratory system, central nervous system |
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Personal Protection/Sanitation (See protection codes)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash (>7%) |
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush
Breathing: Respiratory support
Swallow: Medical attention immediately |
Respirator Recommendations NIOSH/OSHA Up to 50 mg/m3:
(APF = 25) Any powered, air-purifying respirator with a high-efficiency particulate filter.£
(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter.
Click here for information on selection of N, R, or P filters.
(APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode£
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus Escape:
(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter.
Click here for information on selection of N, R, or P filters.
Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection |
| See also: INTRODUCTION See ICSC CARD: 0166 See MEDICAL TESTS: 0120 |
