Product Identification

Product Name

Hydroxyhydroquinone

Synonyms

1,2,4-Trihydroxybenzene
2,5-Dihydroxyphenol
2-Hydroxy-1,4-hydroquinone
4-Hydroxycatechol
Benzene-1,2,4-triol
Hydroxyhydroquinone

CAS

533-73-3

Formula

C6H6O3

Molecular Weight

126.11

EINECS

208-575-1

RTECS

DC4200000

RTECS Class

Mutagen; Primary Irritant

Merck

13,1073

Beilstein/Gmelin

2042863

Beilstein Reference

4-06-00-07338

Physical and Chemical Properties

Appearance

Beige powder.

Solubility in water

Soluble

Melting Point

140

Boiling Point

362

Vapor Pressure

.00001

Density

1.45 g/cm3

pKa/pKb

9.58 (pKa)

Partition Coefficient

.06

Heat Of Vaporization

63.2 kJ/mol

Heat Of Combustion

-2655 kJ/mol

Usage

Substance is used in gas analysis.

Vapor Density

Negligible

Refractive Index

1.5445 (20 C)

First Aid Measures

Ingestion

Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.

Inhalation

Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.

Skin

Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.

Eyes

Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Handling and Storage

Storage

Keep containers tightly closed. Do not expose to air. Store protected from light. Store in a cool, dry area away from incompatible substances.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Store protected from light. Store protected from air. Do not breathe dust.

Hazards Identification

Inhalation

Causes respiratory tract irritation. Can produce delayed pulmonary edema.

Skin

Causes skin irritation. Substance is readily absorbed through the slkin.

Eyes

Causes eye irritation. May cause chemical conjunctivitis.

Ingestion

May cause gastrointestinal irritation with nausea, vomiting and diarrhea.

EC Risk Phrase

R 36/37/38

EC Safety Phrase

S 26 36

Exposure Controls/Personal Protection

Personal Protection

Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves and clothing to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.

Respirators

Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.

Exposure Effects

Effects may be delayed.

Poison Class

3

Fire Fighting Measures

Flash Point

193

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire use water spray, dry chemical, carbon dioxide, or appropriate foam.

Accidental Release Measures

Small spills/leaks

Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity

Incompatibilities

Oxidizing agents, bases, acid chlorides, acid anhydrides, air, direct light.

Stability

Stable under normal temperatures and pressures. May discolor on exposure to air. Light sensitive.

Decomposition

Carbon monoxide, carbon dioxide, acrid smoke and fumes.