o-Cresol

  • 2-Hydroxy-1-methylbenzene
  • 2-Methylphenol
  • o-Hydroxytoluene
Formula
C7H8O
Structure
Description
White crystalline solid or yellowish liquid with a phenolic or sweet tarry odor. Turns black with age and exposure to air and light.
Uses
For making synthetic resins, in disinfectants and fumigants, as industrial solvent.

Registry Numbers and Inventories.
CAS
95-48-7
EC (EINECS/ELINCS)
202-423-8
EC Index Number
604-004-00-9
EC Class
Toxic; Corrosive
R 24/25 34
S 36/37/39 45
RTECS
GO6300000
RTECS class
Tumorigen; Mutagen; Primary Irritant
UN (DOT)
2076
Merck
13,2604
Beilstein/Gmelin
506917
Beilstein Reference
4-06-00-01940
RCRA
U052
Swiss Giftliste 1
G-3265
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C7H8O
Formula mass
108.14
Melting point, °C
30 - 34
Boiling point, °C
191
Vapor pressure, mmHg
0.3
Vapor density (air=1)
3.72
Saturation Concentration
300 ppm (0.03%) at 20 C; 400 ppm (0.04%) at 25 C (calculated)
Odor Threshold Odor threshold 5 ppm 1.4 mg/L
Critical temperature
424.4
Critical pressure
49.4
Density
1.047 g/cm3 (20 C)
Solubility in water
25 g/L
Viscosity
7.61 cp (25 C)
Surface tension
33.5 g/s2 (18 C)
Refractive index
1.5386 (35 C)
pKa/pKb
10.287 (pKa)
Partition coefficient, pKow
1.95
Heat of vaporization
45.2 kj/mol
Heat of combustion
-3693 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Corrosives area.
D1A E
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Ground and bond containers when transferring material. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Do not ingest or inhale. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
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.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container.
Disposal code
9
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, strong acids, bases, alliphatic amines, chlorosulfonic acid, oleum.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
81
Autoignition, °C
555
Upper exp. limit, %
7.6
Lower exp. limit, %
1.4
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguishing media: For small fires, use dry chemical, carbon dioxide, or water spray. For large fires, use dry chemical, carbon dioxide, alcohol-resistant foam, or water spray.
Fire potential
Fire may produce irritating or poisonous gases.
Hazards
Runoff from fire control water may give off poisonous gases. This material Container may explode in heat of fire. Slight explosion and fire hazard in the form of vapor when exposed to heat or flame. When heated to decomposition, it emits highly toxic fumes. Reacts violently with nitric acid, oleum, and chlorosulfonic acid.
Combustion products
Flammable toxic vapors given off in fire.
Health
3
 
Flammability
2
 
 
Reactivity
0
 

Health.
Exposure limit(s)
OSHA PEL: TWA 5 ppm (22 mg/m3) skin NIOSH REL: TWA 2.3 ppm (10 mg/m3) NIOSH IDLH: 250 ppm
Poison_Class
3
Exposure effects
May cause liver and kidney damage. May cause appetite loss, diarrhea, skin abnormalities, and digestive tract disturbances.
   Ingestion
Causes gastrointestinal irritation with nausea, vomiting and diarrhea. Causes gastrointestinal tract burns. May cause liver and kidney damage. Cresols may cause abnormalities of the central nervous system, respiratory system, spleen and pancreas.
   Inhalation
May be fatal if inhaled. Causes severe irritation of upper respiratory tract with coughing, burns, breathing difficulty, and possible coma. May cause headache. May cause nausea and possible vomiting.
   Skin
May be absorbed through the skin in harmful amounts. Causes severe skin irritation and burns.
   Eyes
May result in corneal injury. Causes eye irritation and burns. May cause conjunctivitis and keratitis.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Discard contaminated clothing in a manner which limits further exposure. Destroy contaminated shoes.
   Eyes
Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
2076
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
CRO
 
21 Phenols, Cresols
HS Code
2907 12 00
 
Std. Transport #
4921606
 
IMO Chemical Code
17
IMO Pollution Category
A
IMO Hazard code
S/P