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Chemical Name:
Molecular Formula:
Formula Weight:
MOL File:


Melting point:
175-180 °C
Boiling point:
378.87°C (rough estimate)
1.5288 (rough estimate)
refractive index 
1.4900 (estimate)
Flash point:
11 °C
storage temp. 
Stablr. Incompatible with strong bases, strong oxidizing agents.
CAS DataBase Reference
93-72-1(CAS DataBase Reference)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  Xn,N,T,F
Risk Statements  22-38-50/53-39/23/24/25-23/24/25-52/53-11
Safety Statements  37-60-61-45-36/37-16-7
RIDADR  UN 3077 9/PG 3
WGK Germany  3
RTECS  UF8225000
HazardClass  9
PackingGroup  III
HS Code  29189990
Toxicity LD50 orally in rats: 650 mg/kg (Bailey, White)
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H225 Highly Flammable liquid and vapour Flammable liquids Category 2 Danger P210,P233, P240, P241, P242, P243,P280, P303+ P361+P353, P370+P378,P403+P235, P501
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H370 Causes damage to organs Specific target organ toxicity, single exposure Category 1 Danger P260, P264, P270, P307+P311, P321,P405, P501
H400 Very toxic to aquatic life Hazardous to the aquatic environment, acute hazard Category 1 Warning P273, P391, P501
H410 Very toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 1 Warning P273, P391, P501
H411 Toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 2
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P264 Wash hands thoroughly after handling.
P264 Wash skin thouroughly after handling.
P273 Avoid release to the environment.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P311 Call a POISON CENTER or doctor/physician.
P321 Specific treatment (see … on this label).
P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P332+P313 IF SKIN irritation occurs: Get medical advice/attention.
P501 Dispose of contents/container to..…


Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 40552 Silvex solution 5000 μg/mL in methanol, analytical standard 93-72-1 40552 $44 2018-11-23 Buy
Sigma-Aldrich 49117 Silvex analytical standard 93-72-1 49117 $52 2018-11-23 Buy
Alfa Aesar L08136 2-(2,4,5-Trichlorophenoxy)propionic acid, 96% 93-72-1 5g $70.2 2018-11-13 Buy
Alfa Aesar L08136 2-(2,4,5-Trichlorophenoxy)propionic acid, 96% 93-72-1 25g $297 2018-11-13 Buy

2-(2,4,5-TRICHLOROPHENOXY)PROPIONIC ACID Chemical Properties,Uses,Production

Chemical Properties

slightly beige crystalline powder


Herbicide and plant growth regulator.


Silvex was formerly used as a herbicide. Itsuse in rice fields, sugarcane, and orchards hasbeen stopped by the EPA.

General Description

White powder. Sinks and mixes slowly with water.

Reactivity Profile

A halogenated organic acid derivative. Carboxylic acids donate hydrogen ions if a base is present to accept them. They react in this way with all bases, both organic (for example, the amines) and inorganic. Their reactions with bases, called "neutralizations", are accompanied by the evolution of substantial amounts of heat. Neutralization between an acid and a base produces water plus a salt. Carboxylic acids with six or fewer carbon atoms are freely or moderately soluble in water; those with more than six carbons are slightly soluble in water. Soluble carboxylic acid dissociate to an extent in water to yield hydrogen ions. The pH of solutions of carboxylic acids is therefore less than 7.0. Many insoluble carboxylic acids react rapidly with aqueous solutions containing a chemical base and dissolve as the neutralization generates a soluble salt. Carboxylic acids in aqueous solution and liquid or molten carboxylic acids can react with active metals to form gaseous hydrogen and a metal salt. Such reactions occur in principle for solid carboxylic acids as well, but are slow if the solid acid remains dry. Even "insoluble" carboxylic acids may absorb enough water from the air and dissolve sufficiently in 2-(2,4,5-TRICHLOROPHENOXY)PROPIONIC ACID to corrode or dissolve iron, steel, and aluminum parts and containers. Carboxylic acids, like other acids, react with cyanide salts to generate gaseous hydrogen cyanide. The reaction is slower for dry, solid carboxylic acids. Insoluble carboxylic acids react with solutions of cyanides to cause the release of gaseous hydrogen cyanide. Flammable and/or toxic gases and heat are generated by the reaction of carboxylic acids with diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides. Carboxylic acids, especially in aqueous solution, also react with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat. Their reaction with carbonates and bicarbonates generates a harmless gas (carbon dioxide) but still heat. Like other organic compounds, carboxylic acids can be oxidized by strong oxidizing agents and reduced by strong reducing agents. These reactions generate heat. A wide variety of products is possible. Like other acids, carboxylic acids may initiate polymer


Use has been restricted.

Health Hazard

Silvex is moderately toxic to test animals.The toxic effects are comparable to thoseof 2,4-D and 2,4,5-T. Oral or subcutaneousadministration in mice caused embryo toxi-city and fetal death. The oral LD50 value inrats is 650 mg/kg.

Health Hazard

INHALATION: Irritating to nose and throat. May cause nausea, vomiting, lethargy and incoordination. May cause kidney and liver damage. EYES: Irritation. May cause corneal injury or burn. SKIN: Irritation.

Fire Hazard

Special Hazards of Combustion Products: Hydrogen chloride may be liberated.

Safety Profile

A suspected carcinogen. Poison by ingestion. An experimental teratogen. When heated to decomposition it emits toxic fumes of Cl-.

2-(2,4,5-TRICHLOROPHENOXY)PROPIONIC ACID Preparation Products And Raw materials

Raw materials

Preparation Products


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