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| Hydroquinone | CAS 123-31-9 | ||
| C6H4(OH)2 | RTECS MX3500000 | ||
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Synonyms & Trade Names p-Benzenediol; 1,4-Benzenediol; Dihydroxybenzene; 1,4-Dihydroxybenzene; Quinol |
DOT ID & Guide 2662 153 |
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Exposure Limits |
NIOSH REL: C 2 mg/m3 [15-minute] | ||
| OSHA PEL: TWA 2 mg/m3 | |||
| IDLH 50 mg/m3 | Conversion | ||
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Physical Description Light-tan, light-gray, or colorless crystals. |
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MW: 110.1 |
BP: 545°F |
MLT: 338°F |
Sol: 7% |
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VP: 0.00001 mmHg |
IP: 7.95 eV |
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Sp.Gr: 1.33 |
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Fl.P: 329°F (Molten) |
UEL: ? |
LEL: ? |
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| Combustible Solid; dust cloud may explode if ignited in an enclosed area. | |||
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Incompatibilities & Reactivities Strong oxidizers, alkalis |
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Measurement Methods NIOSH 5004 |
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Personal Protection & Sanitation 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 |
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Respirator Recommendations
NIOSH/OSHA Up to 50 mg/m3: (APF = 25) Any powered, air-purifying respirator with a dust filter�/(APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/(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 a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus |
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| 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 breathing; muscle twitching, delirium; collapse; skin irritation, sensitization, dermatitis | |
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Target Organs
Eyes, skin, respiratory system, central nervous system |
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| See also: INTRODUCTION |