# NIOSH Pocket Guide to Chemical Hazards
Metribuzin | CAS 21087-64-9
C8H14N4OS | RTECS XZ2990000
Synonyms & Trade Names 4-Amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 5 mg/m3
OSHA PEL†: none
IDLH N.D. | Conversion
Physical Description Colorless, crystalline solid. [herbicide]
MW: 214.3 | BP: ? | MLT: 257°F | Sol: 0.1%
VP: 0.0000004 mmHg | IP: ? |  | Sp.Gr: 1.31
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Solid
Incompatibilities & Reactivities None reported
Measurement Methods OSHA PV2044
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated/Daily Remove: When wet or contaminated Change: Daily | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash Breathing: Fresh air Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms In animals: central nervous system depression; thyroid, liver enzyme changes
Target Organs central nervous system, thyroid, liver
See also: INTRODUCTION