o-Xylene

Synonyms & Trade Names

1,2-Dimethylbenzene, ortho-Xylene, o-Xylol

CAS No.

95-47-6

RTECS No.

ZE2450000

DOT ID & Guide

1307 130

Formula

C₆H₄(CH₃)₂

Conversion

1 ppm = 4.34 mg/m³

IDLH

900 ppm
See: 95476

Exposure Limits

NIOSH REL

TWA 100 ppm (435 mg/m³) ST 150 ppm (655 mg/m³)

OSHA PEL

TWA 100 ppm (435 mg/m³) See Appendix G

Measurement Methods

NIOSH 1501 , 3800;
OSHA 1002
See: NMAM or OSHA Methods

Physical Description

Colorless liquid with an aromatic odor.

Molecular Weight

106.2

Boiling Point

292°F

Freezing Point

-13°F

Solubility

0.02%

Vapor Pressure

7 mmHg

Ionization Potential

8.56 eV

Specific Gravity

0.88

Flash Point

90°F

Upper Explosive Limit

6.7%

Lower Explosive Limit

0.9%

Class IC Flammable Liquid: Fl.P. at or above 73°F and below 100°F.

Incompatibilities & Reactivities

Strong oxidizers, strong acids

Exposure Routes

inhalation, skin absorption, ingestion, skin and/or eye contact

Symptoms

irritation eyes, skin, nose, throat; dizziness, excitement, drowsiness, incoordination, staggering gait; corneal vacuolization; anorexia, nausea, vomiting, abdominal pain; dermatitis

Target Organs

Eyes, skin, respiratory system, central nervous system, gastrointestinal tract, blood, liver, kidneys

Personal Protection/Sanitation

(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated
Remove:When wet (flammable)
Change:No recommendation

First Aid

(See procedures)
Eye:Irrigate immediately
Skin:Soap wash promptly
Breathing:Respiratory support
Swallow:Medical attention immediately

Respirator Recommendations

NIOSH/OSHA

Up to 900 ppm:
(APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s)*
(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)*
(APF = 10) Any supplied-air respirator*
(APF = 50) Any self-contained breathing apparatus 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 (gas mask) with a chin-style, front- or back-mounted organic vapor canister
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

o-Xylene

NIOSH REL

OSHA PEL

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