Substance profile
Pendimethalin
Pendimethalin is an orange-yellow crystal solid with a faint, nutty odor.
01 · Identification
What Pendimethalin is
Pendimethalin is an orange-yellow crystal solid with a faint, nutty odor. Its molecular formula is C13H19N3O4 and its molecular weight is 281.31 g/mol. It melts at 56.5 °C, is soluble in water.
Under the GHS it carries the signal word Warning.
Other names for Pendimethalin
- pendimethalin (ISO)
- N-(1-ethylpropyl)-2,6-dinitro-3,4-xylidine
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
03 · Physical and chemical properties
Pendimethalin properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | Decomposes on distillation | decomposes | HSDB |
| Melting point | 56.5 °C (133.7 °F) | range, midpoint shown | HSDB |
| Density | 1.19 g/cm³ | at 25 °C | HSDB |
| Solubility | Soluble in most organic solvents | HSDB | |
| Acetone, 161; DMSO, 21.4; n-heptane, 11.2; methanol, 5.5; methylene chloride, 232; toluene, 128.4; xylene soluble (all in g/100 mL, 25 °C) | at 25 °C | HSDB | |
| Vapor pressure | 0.0000094 mmHg | at 25 °C | HSDB |
| 0.00003 mmHg | Haz-Map | ||
| Flash point | 33.33 °C (92 °F) | HSDB | |
| Corrosivity | Non-corrosive | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Source notes
Further notes on Pendimethalin
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
Solubility
All at 20 °C: acetone, 800 g/L; xylene, >800 g/L; hexane, 48.98 g/L, dichloromethane, >800 g/L; Readily soluble in benzene, toluene, and chloroform; slighlty soluble in petroleum ether and petrol
Source: HSDB
05 · Handling and storage
Storing and handling Pendimethalin
Storage conditions
Store above 40 °F. Extended storage at temperatures less than 40 °F can result in the formation of crystals on the bottom of the container. If crystallization does occur, store the container on its side at room temperature (70 °F) and rock occasionally until crystals redissolve. Do not store near food or feed products.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
A dinitroaniline derivative.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Pendimethalin in the storage compatibility matrix →