2,4,5-Trichlorophenoxypropionic acid

  • 2-(2,4,5-Trichlorophenoxy)propionic acid
  • Silvex
  • Fenoprop
  • 2,4,5-TC
  • 2,4,5-TP acid
Formula
C9H7Cl3O3
Structure
Description
White powder.
Uses
Plant hormone - former use, herbicide.

Registry Numbers and Inventories.
CAS
93-72-1
EC (EINECS/ELINCS)
202-271-2
EC Index Number
607-047-00-1
EC Class
Harmful; Irritant; Dangerous for the Environment
R 22 38 50/53
S 37 60 61
RTECS
UF8225000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Reproductive Effector
UN (DOT)
2765
Merck
12,8679
Beilstein/Gmelin
1985768
Beilstein Reference
3-06-00-00721
RCRA
U233
EPA OPP
82501
Swiss Giftliste 1
G-3382
Japan ENCS (MITI)
Listed

Properties.
Formula
C9H7Cl3O3
Formula mass
269.51
Melting point, °C
178 - 180
Boiling point, °C
378
Vapor pressure, mmHg
2E-6 (25 C)
Density
1.2085 g/cm3 (20 C)
Solubility in water
0.14 g/L
pKa/pKb
2.84 (pKa)
Partition coefficient, pKow
3.80
Heat of vaporization
66.1 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal shipping and handling conditions.
Incompatibilities
Strong oxidizing agents, strong bases.
Decomposition
Hydrogen chloride, carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
183
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguishing media: Substance is nonflammable; use agent most appropriate to extinguish surrounding fire.
Fire potential
Nonflammable.
Hazards
Containers may explode when heated.
Combustion products
Hydrogen chloride may be liberated.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
Low dose exposures - vertigo, headache, malaise, and paresthesias may occur depending on the specific compound involved. High dose exposures - muscle twitching, spasms, profound weakness, polyneuritis, and unconsciousness may occur depending on the specific compound involved. Idiosyncratic reactions - peripheral neuropathies 2,4-D and 2,4,5-T have caused adverse reproductive effects in experimental animals. Allegations of human birth defects due to these compounds have not been confirmed.
   Ingestion
May cause irritation of the digestive tract.
   Inhalation
Causes respiratory tract irritation.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
2765
Response guide
Hazard class
6.1
Packing Group
III
 
USCG CHRIS Code
TPA