Xylenes

  • Xylenes, mixed
Formula
C6H4(CH3)2
Structure
Description
Colorless liquid with a characteristic odor.
Uses
Aviation gasoline; protective coatings; solvent for alkylated resins, lacquers, enamels, rubber cements; synthesis of organic chemicals.

Registry Numbers and Inventories.
CAS
1330-20-7
EC (EINECS/ELINCS)
215-535-7
EC Index Number
601-022-00-9
EC Class
Flammable; Harmful; Irritant
R 10 20/21 38
RTECS
ZE2100000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen; Reproductive Effector; Human Data; Primary Irritant
UN (DOT)
1307
Merck
12,10214
Beilstein/Gmelin
1901563
Beilstein Reference
4-05-00-00951
RCRA
U239
EPA OPP
86802
Swiss Giftliste 1
G-2020
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C8H10
Formula mass
106.17
Melting point, °C
> -34
Boiling point, °C
140
Vapor pressure, mmHg
8
Vapor density (air=1)
4.5
Saturation Concentration
Variable - approximately 7900-8550 ppm (0.79-0.86%) at 20 C (calculated)
Evaporization number
13.5 (diethyl ether = 1)
Odor Threshold Odor threshold 4.5 mg/m3
Critical temperature
343
Critical pressure
34.64
Density
1.096 g/cm3
Solubility in water
Insoluble
Viscosity
0.34 cp (30 C)
Surface tension
28.48 g/s2 (20 C)
Refractive index
1.50 (20 C)
Dielectric constant
2.4 (25 C)
Partition coefficient, pKow
3.12-3.20

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.
B2 D2A D2B
Handling
Wash thoroughly after handling. Use with adequate ventilation. Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Wear appropriate protective gloves, clothing and goggles.
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. Remove all sources of ignition. A vapor suppressing foam may be used to reduce vapors. Water spray may reduce vapor but may not prevent ignition in closed spaces.
Disposal code
1
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong acids, strong oxidizers and 1,3-dichloro-5,5-dimethyl-2,4-imidazolidindione (dichlorohydrantoin). Attacks some forms of plastics, rubber and coatings.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
25
Autoignition, °C
465
Upper exp. limit, %
7.5
Lower exp. limit, %
1.7
Fire fighting
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Solid streams of water may spread fire. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use foam, dry chemical, or carbon dioxide.
Fire potential
HIGHLY FLAMMABLE.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
2
 
Flammability
3
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
Chronic exposure to organic solvents has been associated with various neurotoxic effects including permanent brain and nervous system damage.
   Ingestion
May cause central nervous system depression, kidney damage, and liver damage. Symptoms may include: headache, excitement, fatigue, nausea, vomiting, stupor, and coma. Causes gastrointestinal irritation with nausea, vomiting and diarrhea. Aspiration of material into the lungs may cause chemical pneumonitis, which may be fatal.
   Inhalation
Inhalation of high concentrations may cause central nervous system effects characterized by headache, dizziness, unconsciousness and coma. Inhalation of vapor may cause respiratory tract irritation. Prolonged exposure may result in dizziness and general weakness. Irritation may lead to chemical pneumonitis and pulmonary edema.
   Skin
Exposure may cause irritation characterized by redness, dryness, and inflammation. Prolonged and/or repeated contact may cause defatting of the skin and dermatitis.
   Eyes
Causes severe eye irritation.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Possible aspiration hazard. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Discard contaminated clothing in a manner which limits further exposure.
   Eyes
First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

Transport.
UN number
1307
Response guide
Hazard class
3
Packing Group
II; III
 
USCG CHRIS Code
XLX
 
32 Aromatic hydrocarbons
HS Code
2902 44 00
 
Std. Transport #
4909348 4909198 4909349 4909351 4909391 4909392 4909393 4909394 4909395 4909396 4909397 4910215
 
IMO Chemical Code
17
IMO Pollution Category
C
IMO Hazard code
P