Product Identification

Product Name

2,3,5-Trimethylhydroquinone

Synonyms

1,4-Benzenediol, 2,3,5-trimethyl-
1,4-Dihydroxy-2,3,5-trimethylbenzene
3,6-Dihydroxypseudocumol
Pseudocumohydroquinone
psi-Cumohydroquinone
TMHQ

CAS

700-13-0

Formula

C9H12O2

Molecular Weight

152.19

EINECS

211-838-3

RTECS

MX7820000

RTECS Class

Reproductive Effector

Beilstein/Gmelin

1909183

Beilstein Reference

4-06-00-05997

EC Index Number

604-045-00-2

EC Class

Harmful; Irritant; Sensitising; Dangerous for the Environment

Physical and Chemical Properties

Appearance

Off-white to tan - orange powder.

Melting Point

172-174

Boiling Point

295

Vapor Pressure

31 (177 C)

First Aid Measures

Ingestion

If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.

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 exposed skin throughly with soap and water.

Eyes

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

Handling and Storage

Storage

Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation.

Hazards Identification

Inhalation

Causes respiratory tract irritation. Causes irritation of mucous membrane.

Skin

Causes skin irritation.

Eyes

Causes eye irritation.

Ingestion

Causes digestive tract irritation.

EC Risk Phrase

R 20 37/38 41 43 50/53

EC Safety Phrase

S 24 26 37/39 60 61

UN (DOT)

3077

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 to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.

Respirators

Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Exposure Effects

May cause reproductive and fetal effects.

Poison Class

3

Fire Fighting Measures

Flash Point

191

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, dry chemical, chemical foam, or alcohol-resistant 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

Stability

Stable under normal temperatures and pressures.

Incompatibilities

Strong oxidizing agents.

Decomposition

Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, acrid smoke and fumes.

Transport Information

UN Number

3077