UN 3376: 4-Nitrophenylhydrazine, with not less than 30 percent water, by mass
DOT Classification and Shipping
UN 3376 is assigned the proper shipping name 4-Nitrophenylhydrazine, with not less than 30 percent water, by mass in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 4.1 Flammable Solid material, Packing Group I. Required label(s): 4.1.
Packing group indicates the degree of danger within a hazard class: PG I is high danger, PG II medium, PG III low. The proper shipping name, hazard class, UN number, and packing group together form the basic shipping description that must appear on shipping papers and, where required, on the package and placard.
Emergency Response (ERG Guide 133)
Hazards: Flammable. May be ignited by friction, heat, sparks. May burn rapidly with flare-burning effect.
Fire: Water spray, foam, dry chemical. Some may be extinguished with CO2.
Spill: Eliminate ignition sources. Do not touch. Cover with dry earth, sand, or non-combustible material.
Chemical and Physical Properties
4-Nitrophenylhydrazine is a orange-red leaflet or needles wetted with water. It will emit toxic oxides of nitrogen when heated to decomposition. It is slightly heavier than water and insoluble in water. It may be irritating to skin, eyes and mucous membranes. It may be toxic by ingestion. It may be explosive and sensitive to friction in the dry state. It is used as a reagent for ketones and aliphatic aldehydes.
Special Provisions
49 CFR 172.102 special provision codes for this entry: 162, A8, A19, A20, N41, W31. These codes modify the general requirements (packaging, quantity limits, exceptions) for this specific material. Look up each code in 49 CFR 172.102 for the full text.
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Reference data compiled from the DOT Hazardous Materials Table (49 CFR 172.101), the 2024 Emergency Response Guidebook, and public chemical databases (PubChem, NIOSH, EPA). Always verify the correct shipping description against the current regulation and the manufacturer's SDS Section 14 before shipping.