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Technical Data Sheet
Metam potassium 690

Chemical Synonym
  • Metam KLR 54%, Taminco Metam K MUP, Enfuse K 690, Potassium N-methyldithiocarbamate
  • Soil fumigants

Product Description
Soil disinfectant for controlling nematodes, soil diseases, weeds and germinating weed seeds. The product works by fumigation. It is applied prior to seeding or planting, creating a favorable biotope that promotes healthy crop growth.

Metam potassium does not damage or leave residue in the planted crop. The activity is due to its decomposition into methyl isothiocyanate (MITC).

Metam potassium can be used for many different types of cultivation, including:

  • Root crops such as carrots, potatoes, peanuts, beets
  • Vegetable crops like lettuces, cucurbits, onions, leaks, tomatoes
  • Strawberries
  • Tobacco
  • Tree nurseries
  • Vineyards and orchards
  • Ornamentals like cut flowers, bulbs, perennials
  • Tropical crops like bananas, pineapples
  • Rice growing (control of "red rice")

The amount of the product that should be applied varies according to the kind of pest to be controlled and the type of soil and climate of the region of application. It is therefore necessary to refer to usage and to amounts approved in the region concerned.

A good application technique is the key to good and lasting disinfection.

Before applying metam potassium, always thoroughly cultivate the area to be treated, breaking up clods to facilitate the uniform distribution of the product.

Keep soil humid 5 to 10 days prior to soil disinfection to activate and sensitize target organisms. Soil humidity at time of application must be between 50 and 75% of the water holding capacity.

Metam potassium can be applied by two methods: soil injection and drip irrigation system.

Injection allows the product to be applied at 10 to 40 cm deep with machines equipped with shanks or goose footshaped blades. The machines are mounted at the rear of a tractor.

Application through the existing drip irrigation system is done by incorporating Metam in the irrigation water with the help of a dosing pump.

After the soil has been treated, it must be left for 2-4 weeks depending on the type of soil, the temperature and the moisture of the soil. Decomposition of any product still remaining in the soil after that time can be accelerated by aeration.

Since methyl isothiocyanate is phytotoxic, planting may not take place until the product has completely decomposed and the treated soil has been fully aerated. In order to decide when planting can take place, a sowing test (cress test) on a representative sample of the treated soil is recommended.

Not all uses and/or products are registered in all countries/regions. Please contact your local Customer Service Representative for availability in your region. Metam potassium is a “Restricted Use Pesticide” in the US.

Typical Properties

PropertyTypical Value, Units
Molecular FormulaC2H4NKS2
Molecular Weight145.23 g/mol
AppearanceAmber to yellowish aqueous solution
Boiling Point97-102 °C
     @ 20°C1.28 g/cm3
FlammabilityNot flammable
Oxidising propertiesNo oxidising properties
Partition coefficient 
     @ 20°Clog P ≤ -2.91
SolubilityMiscible with water
Vapor Pressure 
     @ 25°C5.75 x10-2 Pa

High-density polyethylene drums, 60, 200 and 210 litres, stainless-steel road tankers, 1008 litres IBC's, container (eco bulk).


It is advisable to store metam potassium solution in its original pack or in a stainless-steel tank in a ventilated location protected from frost.

The 690 g/l solution crystallizes below - 25 °C.
Both crystallized and frozen states are reversible after the return to normal temperatures, without loosing its initial qualities.

Keep away from acids to avoid release of CS2.

Metam potassium solution corrodes copper, zinc and their alloys. On contact with ordinary steel it rapidly forms a black precipitate. The following plastics are suitable for joints and pipes: HD polyethylene, polypropylene, polytetrafluoro-ethylene (Teflon) and polyamide (Nylon 6).

After rinsing, empty drums should be sent to a recycling or re-processing agent.

In the event of accidental spillage, cover the product with an absorbent material and collect in drums. Wash contaminated surfaces with water and detergent; absorb the washing solution and send together with the absorbed compound to a treatment plant for chemical waste. Do not release metam potassium into the drains.

Eastman and its marketing affiliates shall not be responsible for the use of this information, or of any product, method, or apparatus mentioned, and you must make your own determination of its suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. No warranty is made of the merchantability of fitness of any product, and nothing herein waives any of the Seller's conditions of sale.

2/28/2018 11:35:39 AM