Hydroquinone
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CAS
123-31-9
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C6H4(OH)2
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RTECS
MX3500000
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Synonyms & Trade Names
p-Benzenediol; 1,4-Benzenediol; Dihydroxybenzene; 1,4-Dihydroxybenzene; Quinol
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DOT ID & Guide
2662 / 153
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Exposure
Limits
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NIOSH REL: C 2 mg/m3 [15-minute]
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OSHA PEL: TWA 2 mg/m3
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IDLH
50 mg/m3
See: 123319
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Conversion
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Physical Description
Light-tan, light-gray, or colorless crystals.
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MW: 110.1
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BP: 545°F
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MLT: 338°F
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Sol: 7%
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VP: 0.00001 mmHg
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IP: 7.95 eV
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Sp.Gr: 1.33
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Fl.P: 329°F (Molten)
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UEL: ?
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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; OSHA PV2094
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash (>7%)
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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 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
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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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
See ICSC CARD: 0166 See MEDICAL TESTS: 0120
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