DIMETHOATE - Sico

PRODUCT INFO
DIMETHOATE
Insecticide (technical/formulations)
PRODUCT DESCRIPTION
Dimethoate is an organophosphorus insecticide of relatively low mammalian toxicity. Combining contact and plant systemic
activity it can be used to control a wide range of insect pests and it is used in many different crops such as vegetables, fruits
and cotton. Like most organophosphates Dimethoate is easily degraded in soil and in plants.
Dimethoate Technical is a white crystalline solid but can also be supplied as a 55% solution in cyclohexanone
(Dimethoate Technical Concentrate.
Chemical name:
ISO name:
0,0-Dimethyl-S-(N-methylcarbamoyl-methyl)-phosphorodithioate
Dimethoate
Structural formula: CH 3 O S
P
CH 3 O S-CH 2 -CO-NH-CH 3
Empirical formula: C 5
H 12
NO 3
PS 2
Moleculair weight: 229.3
Cas no.: 60-51-5
TYPICAL SPECIFICATION
0,0-Dimethyl-S-(N-methylcarbamoyl-methyl)-phosphorodithioate: 96 - 98%
Content of water: Less than 0.5% CIPAC
Description available on request.
Dimethoate technical is observing FAO specification no. 59/1/(S)/13.
PHYSICAL PROPERTIES
Dimethoate Technical
Physical state: Solid crystalline Liquid
Colour: White Colourless
Dimethoate Technical Concentrate
Odour: Mercaptanic Mercaptanic but mainly like cyclohexanone
Melting point: 45 - 47°C 5°c
Flash point: Above 110°C (P.M. c.c.) 52°C (P.M. c.c.)
Solubility:
Highly soluble in chloroform,
methylene chloride, benzene,
toluene, alcohols, esters and
ketones. Slightly soluble in
xylene, carbon tetrachloride
and aliphatic hydrocarbons.
Solubility in water: 2.5% at 21°C
Specific gravity: 1.28 at 20°C 1.18 at 20°C
Refractive index: At 50°C - 1.5377
Vapour pressure: 3 x 10 4 mm Hg at 50°C 4 mm Hg at 20°C (cyclohexanone)
10 mm Hg at 38.7°C (cyclohexanone)
Information in this publication is believed to be accurate and is given in good faith, but is for the customer to satisfy itself of the
suitability for its own particular purpose. No representation, warranty of guarantee is made as to its accuracy, reliability or completeness.
Sap International Corporation NV/SA, Krekelenberg 69, B-2980 Zoersel, Belgium
Phone : +32/3/3090651 – Fax : +32/3/3091931 – Email : info@sico.be - Website : Http://www.sico.be
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PRODUCT INFO
STABILITY
To hydrolysis: Dimethoate is rather stable in neutral and acid solutions at roomtemperature. The halflife at 80°C is about 14
hours. In solutions with a pH value higher than 8 the hydrolysis will increase considerably. The halflife at pH 9 and 80 °C is
less than half an hour.
To heat: Dimethoate Technical is stable for a long period when stored under temperatures not exceeding 20/23°C. Dimethoate
should not be heated above 35°C. At higher temperatures Dimethoate will decompose rapidly.
FORMULATIONS
Dimethoate is normally marketed in the following formulations:
1. Emulsifiable concentrates 4. Wettable powders_
2. Solutions (eg. oil formulations) 5. Granules_
3. Formulations for ULV application 6. Dust
The choice of formulation depends on the target. If the target is insects on crops, the choice will depend on such factors as
the type of crop and its state of growth, the kind of insects, the stage of development and infestation, and furthermore on the
application equipment available and application method intended.
Formulations should be prepared on the basis of waterfree ingredients (emulsifiers, solvents etc.)_Solvents used for formulations
are normally cyclohexanone, xylene and phenol. The percentage of emulsifier required for an emulsifiable concentrate
varies from 5 - 15% of active ingredient depending on the concentration of active ingredient and on the stability required of
the emulsion.
The optimum blend of emulsifier is mainly governed by the concentration of active ingredient in the formulation, the water's
degree of hardness and temperature.
A typical Dimethoate emulsifiable concentrate would be:
Dimethoate 400 g/liter EC g/kg g/liter
Dimethoate Technical 392 g 412 g
Emulsifier mixture 48 g 50 g
Cyclohexanone 430 g 452 g
Xylene 130 g 137 g
1000 g 1051 g
Specific gravity: Approx. 1.051
Solid formulations should be prepared on the basis of suitable, carefully chosen carriers and surfactants. Laboratory evaluation
of the manufactured formulation is recommended before commercial production is attempted.
Glass, polyethylene, stainless steel and hard-baked epoxy phenolic laquer coated containers are suitable for storage over a period.
Uncoated carbon steel containers should not be used for storage.
Information on formulation types, recipes including advice concerning solvents, emulsifiers and surface active ingredients is
available on request.
USES AND PESTS CONTROLLED
Dimethoate combining contact and systemic activity will control biting as well as sucking insects and mites.
Uses: Alfalfa, asparagus, apples, beans, beets, cabbage, cherry, citrus, grapes, cotton, groundnuts, lettuce, melon, olives,
pears, peas, potatoes, tobacco, tomatoes, turnips, wheat, ornamentals and other crops. Residual wall spray in
farm buildings.
Pests controlled: Aphides, bugs, codling moths, Drosophila, flies, grasshoppers, jassids, leafhoppers, leafminers,
loopers, lygus bugs, mites, olive flies, pear psylla, scale insects, thrips, whiteflies and others.
Phytotoxicity: Normally non-phytotoxic at recommended rates, but injury has been reported on certain variaties especially
with low volume applications (a.o. hops and chrysanthemum).
COMPATIBILITY
Dimethoate is compatible with most other pesticides, provided they are not alkaline in reaction.
Dimethoate is compatible in the spray tank with:
Lead arsenate Gusathion Dieldrin
Endrin Nicotine sulphate Chlordane
Toxaphene Rotenone DDT
Dinitrocompounds Aldrin BHC
Wettable sulphur Pyrethrum Carbaryl
Diazinon Dithiocarbamates and other organophosphates
Information in this publication is believed to be accurate and is given in good faith, but is for the customer to satisfy itself of the
suitability for its own particular purpose. No representation, warranty of guarantee is made as to its accuracy, reliability or completeness.
Sap International Corporation NV/SA, Krekelenberg 69, B-2980 Zoersel, Belgium
Phone : +32/3/3090651 – Fax : +32/3/3091931 – Email : info@sico.be - Website : Http://www.sico.be
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PRODUCT INFO
However, beware of "synergistic effects", e.g. toxicity or phytotoxicity cause by mixing of compounds.
Take care if mixing with alcohols. Re-esterification may take place and the toxicity may change.
As compatibility will always depend upon the type of formulation, a test before mixing is recommended.
Dimethoate is not compatible with:
Bordeaux mixtures Zinc arsenate Lime sulphur
Calcium arsenate Lime Paris green
PRE-HARVEST INTERVAL : 7 - 35 days, however, check local regulations.
TOXICITY
Dimethoate is of relatively low toxicity to mammalians.
Oral LD50 rats is 320 - 380 mg/kg
Dermal LD50 rats is 600 - 1200 mg/kg
Poisoning symptoms: As for other organophosphorus insecticides symptoms of poisoning are headache, tightness in the
chest, blurred vision, non reactive pin-point pupils, salivation, sweating, nausea, vomiting and abdominal cramps.
PRECAUTIONS
Keep out of reach of children. Don't swallow, breathe or touch Dimethoate. Natural gloves, clean protective clothing and a
respirator of the organic vapour type are necessary for the protection in handling this material. Assure plenty of vantilation in
the working area. Determine the normal cholinesterase level of each worker involved in formulation work and check with
regular intervals. Never keep lood or tobacco on you or in working area and wash hands, arms and face thoroughly before
eating or smoking. Bathe immediately after work.
Contamination of foodstuffs, empty foodstuff containers and animal feed must be avoided. Containers must be stored and
disposed of in such way as to prevent all possibility of accidental contact. Decontaminate empty containers for discharge by
flushing with a strong soda lye. Sweep up spillage, rinse area with soda lye and bury sweepings safely.
Empty container disposal must be done according to local regulations.
Empty packing must not be applied for other purposes. It must be removed according to the legalisation of each country, for
instant by destruction of the residue and burial of the empty packing or by delivery to a plant authorized to handle emptied
packing possibly containing residues.
In case of contact, immediately remove contaminated clothing and wash skin thoroughly with soap and water; for eyes, flush
with water for 15 minutes. If swallowed, induce vomiting. This can be done by introducing a finger into the throat. After
vomiting administer about 20 g of granulated carbon suspension. If poisoning occurs, call a physician.
Antidote: Atropine, toxogonin and oxygen are useful treatment and artificial respiration may be required with little warning.
Every endeavour has been made to ensure that the information given herein is true and reliable but it is given only for the guidance of our customers.
Sap International cannot accept any responsibility for loss or damage or infringement of patent rights, that may result from the use of
information, due to the possibility of variations of processing or working conditions and of workmanship outside our control. Users are advised
to confirm the suitability of the products with their own tests.
Information in this publication is believed to be accurate and is given in good faith, but is for the customer to satisfy itself of the
suitability for its own particular purpose. No representation, warranty of guarantee is made as to its accuracy, reliability or completeness.
Sap International Corporation NV/SA, Krekelenberg 69, B-2980 Zoersel, Belgium
Phone : +32/3/3090651 – Fax : +32/3/3091931 – Email : info@sico.be - Website : Http://www.sico.be
Page 3 of 3