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o-Tolidine

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Synonyms & Trade Names
4,4'-Diamino-3,3'-dimethylbiphenyl, Diaminoditolyl, 3,3'-Dimethylbenzidine, 3,3'-Dimethyl-4,4'-diphenyldiamine, 3,3'-Tolidine
CAS No.
119-93-7
RTECS No.
DD1225000
DOT ID & Guide
Formula
C₁₄H₁₆N₂
Conversion
IDLH
Ca [N.D.]
See: IDLH INDEX
Exposure Limits
NIOSH REL
Ca C 0.02 mg/m3 [60-minute] [skin] See Appendix A See Appendix C
OSHA PEL
See Appendix C
Measurement Methods
NIOSH 5013;
OSHA 71
See: NMAM or OSHA Methods
Physical Description
White to reddish crystals or powder. [Note: Darkens on exposure to air. Often used in paste or wet cake form. Used as a basis for many dyes.]
Molecular Weight
212.3
Boiling Point
572°F
Melting Point
264°F
Solubility
0.1%
Vapor Pressure
?
Ionization Potential
?
Specific Gravity
?
Flash Point
?
Upper Explosive Limit
?
Lower Explosive Limit
?
Combustible Solid
Incompatibilities & Reactivities
Strong oxidizers
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
irritation eyes, nose; In Animals: liver, kidney damage; [potential occupational carcinogen]
Target Organs
Eyes, respiratory system, liver, kidneys
Cancer Site
[in animals: liver, bladder & mammary gland tumors]
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated/Daily
Remove:When wet or contaminated
Change:Daily
Provide:Eyewash, Quick drench
First Aid
(See procedures)
Eye:Irrigate immediately
Skin:Soap flush immediately
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations

NIOSH

At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(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 having an N100, R100, or P100 filter.
Click here for information on selection of N, R, or P filters.
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0960
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health