Endosulfan
Insecticide organochlorine
Features:
1) Common name: endosulfan
2) Structural formula:
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3) Chemical name: (1,4,5,6,7,7-hexachloro-8,9,10-trinorborn-5-en-2,3-ylene-
bismethylene)sulfite
4) Molecular formula: C
9H
6Cl
6O
3S
5) Molecular weight: 406.9
6) CAS no.: 115-29-7
Physical-chemical properties
1) Composition: Endosulfan is a mixture of two stereoisomers: alpha-endosulfan, endosulfan(I),
stereochemistry 3α, 5aβ, 6α, 9α, 9aβ-, comprising 64 - 67% of the tech. grade;
beta-endosulfan, endosulfan(II), stereochemistry 3α, 5aα, 6β, 9β, 9aα-, 29 - 32%
2) Appearance: colorless crystals (tech., cream to brown, mostly beige)
3) Melting point: >=80
oC (tech.); α: 109.2
oC; β:213.3
oC
4) Vapor pressure: 0.83mPa (20
oC) for 2:1 mixture of α- andβ-isomers
5) S.g./density: c.1.8 (20
oC) (tech)
6) Solubility:
a) In water alpha-endosulfan 0.32, beta-endosulfan 0.33 (both in mg/L, 22
oC)
b) In ethyl acetate, dichloromethane, toluene 200, ethanol c.65, hexane c.24 (all
in g/L, 20
oC)
7) Stability: stable to sunlight, slowly hydrolysed in aqueous acids and alkalis,
with the formation of diol and sulfur dioxide
Technical specifications:
Endosulfan 94% tech.:
a) a.i. content: 94.0%
b) Water: 0.10%
c) Loss on heating: 2.0%
d) Acidity (H
2SO
4) : 0.10%
e) Appearance: white to slightly yellow flake
Formulation: 35EC
Endosulfan 35% EC
a) a.i. content : >=35.0%
b) Stability: qualified
c) Water: 0.10%
d) Acidity: 0.10%
e) Appearance: slightly brown transparent liquid
Analysis: GC
Packaging: cardboard drum with plastic bag inside
Applications:
1) Action: non-systemic insecticide and acaricide with contact and stomach action
2) Uses:
a) Control of potato beetles and cotton bollworms
b) Also controls other sucking, chewing and boring insects and mites on a very wide
range of crops; including maize, tobacco, vegetables, fruit (including citrus),
vines, olives, ornamentals, cucurbits, tea, coffee, rice, cereals, sorghum, oilseed
crops, sugar cane, alfalfa, mushrooms, forestry, glasshouse crops, etc.
Toxicology:
1) Oral: acute oral LD
50 for rats 70mg (in aqueous suspension)/kg, 110mg
tech. (in oil)/kg, 76mg alpha-isomer/kg, 240mg beta-isomer/kg; for dogs 77mg
tech./kg
2) Skin and eyes: acute percutaneous LD
50 for rabbits 359mg(in oil)/kg;
for male rats >4000, female rats 500mg/kg
3) Inhalation: LC
50 (4h) for male rats 0.0345, female rats 0.0126mg/L
4) NOEL (2y): for rats 15ppm diet; (ly) for dogs 10ppm diet
5) ADI: (JMPR) 0.006mg/kg b.w.
6) Birds: acute oral LD
50 for mallard ducks 205 - 245, ring-necked pheasants
620 - 1000mg/kg
7) Fish: highly toxic LC
50 (96h) for golden orfe 0.002mg/L water, but
in practical use, should be harmless to wildlife
8) Bees: not toxic to bees under field conditions at an application rate of 1.6L/ha
(560g endosulfan/ha)
Payment Term: L/C at sight
