Agent Name

Chlormequat chloride

CAS Number




Major Category



(2-Chloroethyl)trimethylammonium chloride; (2-Chloroethyl)trimethylchloride ammonium; (beta-Chloroethyl)trimethylammonium chloride; 2-Chloraethyl-trimethylammoniumchlorid [German]; 2-Chloro-N,N,N-trimethylethanaminium chloride; 5C Cycocel; 60-CS-16; AC 38555; Ammonium, (2-chloroethyl)trimethyl-, chloride; Antywylegacz; Arotex Extra; Barleyquat; Barleyquat B; Bercema CCC; Bettaquat; CCC; CCC (plant growth regulant); Chlorcholinchlorid [Czech]; Chlorcholine chloride; Chlormequat; Chlormequat chloride [ISO]; Chlorocholine chloride; Choline dichloride; Cyclocel; Cycocel; Cycocel 460; Cycocel C 5; Cycocel Extra; Cycocel-extra; Cycogan; Cycogan extra; Cyocel; EI 38,555; Ethanaminium, 2-chloro-N,N,N-trimethyl-, chloride; Farmacel; Halloween; Helstone; Hico CCC; Hormocel-2CCC; Hyquat; Increcel; Lihocin; Mirbel 5; Premix; Retacel; Stabilan; TUR; Titan; Trimethyl-beta-chlorethylammoniumchlorid [Czech]; Trimethyl-beta-chloroethylammonium chloride; WR 62; Zar; [ChemIDplus] UN2811


Plant Growth Regulators


White solid with a fishy odor; Very hygroscopic; [Merck Index] White crystalline solid; [MSDSonline]


Used as plant growth regulator; [Merck Index] Works by inhibiting the biosynthesis of a plant hormone; Registered for use on ornamental plants grown in greenhouses and nurseries; May be used outside in containerized ornamentals; [Reference #1]


A mild eye irritant; Can be absorbed through skin; "The substance may cause effects on the nervous system: cholinergic symptoms without acetylcholinesterase inhibition." [ICSC] An irritant; Can be absorbed through skin; Effects in high-dose animal studies include convulsions; [MSDSonline] Toxic to hamster embryos; No human data; [REPROTOX]

Reference Link

EPA Pesticide Chemical Search

Exposure Assessment
Vapor Pressure

7.5E-8 mm Hg

Lethal Concentration

LC50 (rat) > 5,200 mg/m3/4h

Explanatory Notes

The Guide in the Emergency Response Guidebook is for "Toxic solid, organic, n.o.s."

Reference Link

EFSA: Chlormequat chloride - 2008

Adverse Effects

Other CNS Neurotoxin

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information


Chemical Information

Search ChemIDplus

Related Information in HazMap

Industrial Processes with risk of exposure: