IUPAC Name :Manganese(2+) ; N-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate
Synonyms :Rhodianebe; Manganese(II) ethane-1,2-diylbis(dithiocarbamate)
Molecular Structure :
Molecular Formula : C₄H₆MnN₂S₄
Molecular Weight :265.30
CAS NO: 12427-38-2
EINECS : 235-654-8
Product Categories: Fungicide
Mol File: 12427-38-2.mol
Melting point: 131°C
Flash Point: 140.2 °C
Enthalpy of Vaporization: 54.88 kJ/mol
Boiling Point: 308.2 °C at 760 mmHg
Vapour Pressure: 0.000692 mmHg at 25°C
Storage temp: 0-6°C
Merck : 13,5743
Appearance: Maneb (CAS NO: 12427-38-2) is a yellow powder or crystalline solid.

Maneb (CAS NO.12427-38-2) is a broad-spectrum bactericide, has wide range of applications.  Maneb (CAS NO.12427-38-2) is mainly used for vegetables and fruit trees, can prevent a variety of anthracnose, downy mildew, scab, blight, spot diseases.

1. Maneb (CAS NO.12427-38-2) is derived by the reaction of Amobam and manganese oxide . adding 40% of the Amobam into the reactor, adding manganese oxide while stirring, heating to 40 °C  for reaction 2h. Cooling, filtration, drying, obtaining Maneb.
2.  Maneb (CAS NO.12427-38-2) may also be obtained by the reaction of Nabam and chloride manganese , adding NaHSO₃ as stabilizing agent, the yield is 95%.

Hazard Codes Xi
Risk Statements 20/21/22-43-37
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed.
R37:Irritating to respiratory system
R43:May cause sensitization by skin contact.
Safety Statements 22-36/37/39-46-24/25-8 
S22:Do not breathe dust.
S8:Keep container dry.
S46:If swallowed, seek medical advice immediately and show this container or label.
S24/25:Avoid contact with skin and eyes.
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
RIDADR 2210
RTECS OP0700000
TSCA No
HazardClass 4.2
PackingGroup III

1.General Description: Maneb is denser than water. Contact may irritate skin, eyes and mucous membranes. Maneb may be toxic by ingestion. Likely to generate heat spontaneously upon exposure to air or water. May be sufficient to ignite the material. Maneb is used as a fungicide. Formulations of Maneb include mixing Maneb with many other chemicals such as sulfur, zinc oxide and others to desensitize it. This is done to make Maneb easer for application.
2.Air & Water Reactions: Highly flammable. Soluble in water. Maneb is likely to generate heat spontaneously, especially when wet. The heat may be sufficient to ignite the material. Thio and dithiocarbamates slowly decompose in aqueous solution to form carbon disulfide and methylamine or other amines. Such decompositions are accelerated by acids.
3.Reactivity Profile: The BPS Pesticide incident in Helena resulted in an explosion and death of three firemen. The burning of a 1,000 pound sack of Azinphos Methyl or the flashing of Maneb which was present on the facility may have caused the explosion.
4.Health Hazard: Fire will produce irritating, corrosive and/or toxic gases. Inhalation of decomposition products may cause severe injury or death. Contact with substance may cause severe burns to skin and eyes. Runoff from fire control may cause pollution.
5.Fire Hazard :Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.