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Fumaphos Fumigation Tablets

Product: APVMA Code :52020
Active Constituent(s): 330g/kg phosphine (present as aluminium phosphide)
Registered For:


 Commercial use

 Domestic use

Overview: For control of insect pests of stored products in certain situations.

 SDS (39 KB)

 Label (197.1 KB)

General Instructions


Directions for Use

BEFORE using Fumaphos you should consider the following: Timing of treatment - If it will be necessary to move grain/commodity before the Total Fumigation Period has expired, then fumigation should NOT be commenced. Movement of treated commodities or empty containers during application, fumigation exposure or ventilation risks exposure of transport and handling workers and the public to harmful levels of phosphine and is contrary to label instruction. The Total Fumigation Period is the sum of the time required for Exposure to phosphine and the time needed to ventilate the grain. A shortened Exposure Period will not be effective for storage pest control and a reduced Ventilation Period poses a serious risk of phosphine gas poisoning to workers and bystanders. In addition a Withholding Period of two days is required after completion of ventilation before the grain is allowed to be used for human consumption or for animal feed. See Notes 4 & 5 for a detailed description of the Minimum Exposure Period and the Ventilat ion Period. Safety and handling of Phosphine Products - Phosphine is a highly dangerous fumigant and fumigation should only be undertaken in situations where the safety of workers and the public can be ensured. Observe all RESTRAINTS, PRECAUTIONS and instructions on the label.




NOTES: 1) FUMIGATION WILL CONTROL ALL STAGES OF INSECTS ONLY IN STRUCTURES/ENCLOSURES THAT ARE WELL SEALED*. Wel l sealed structures/enclosures are fumigation chambers, well sealed silos, sheds and buildings, and other fumigation enclosures made gas-tight with gas-proof sheeting. Well sealed means permanent sealing of porous surfaces, seams and cracks and temporary sealing of intake and/or outlet valves, doors, fan housings, windows and hatches. For further information, see appropriate industry advisory documents such as Grains Research and Development Corporation 'Advice' sheet '$ealed $ilos $ave', available from State Departments of Agriculture or Primary Industries. Increasing the application rate will not compensate for gas lost from an unsealed enclosure.




2) STORAGE PESTS include: lesser grain borer, cadelle, cigarette beetle, confused flour beetle, dried fruit beetle, flat grain beetle, merchant grain beetle, red-legged ham beetle, rustred flour beetle, saw-toothed grain beetle, skin and hide beetle, spider beetles, warehouse beetle, Angoumois grain moth, Indian meal moth, Mediterranean flour moth, mottled grain moth, raisin moth, tobacco moth, tropical warehouse moth, psocids, stored products mites, bean weevil, coffee bean weevil, granary weevil, maize weevil, pea weevil and rice weevil. Approved treatment dosages will also kill any cockroaches, rats and mice present.


3) PHOSPHINE APPLICATION RATES are based on the internal volume of the structures to be fumigated; they apply equally to full or partly filled or empty structures and they apply to all commodities. The commodity equivalent rates (g/tonne) should only be used when the commodity stowage factor is known; they apply only when the storage structures are full or nearly full or when part-filled structures are dosed on the tonnage equivalents of their internal volumes. The calculated commodity equivalent dosage must be based on the rate per volume. The application rate of 1.5 g phosphine per 1 metre3 is equivalent to: Capacity of fumigation enclosure/ Number tablets tonnes wheat/bushels/cubic metres

20 /730 /27 /40(120g)

50 /1830 /65 /100(300g)

100 /3660 /130 /200(600g)

300 /11000 /375 /600(1800g)


4) MINIMUM EXPOSURE PERIODS are needed to allow products to react to completion and to expose insects for long enough to kill all stages. A SHORTENED EXPOSURE PERIOD CANNOT BE COMPENSATED FOR BY INCREASED DOSAGE. Insect death and reaction of the tablets are both slower at lower temperatures. Temperatures specified are those within the commodity to be fumigated. The minimum exposure period should start from time of completion of application of product.



Ventilation of structures is complete only when phosphine concentrations measured at appropriate locations in the enclosure and work area are below the Threshold Limit Value - Time Weighted Average (TLV-TWA) exposure standard of 0.3 ppm. The following are minimum ventilation periods required and may need to be increased to ensure the exposure standard is not exceeded.


Minimum Ventilat ion Periods:


Structures, including bunker storages, containing treated commodities:


a) Without through flow (i.e. access only through the headspace): not less than 5 days


b) With through flow and natural draught (wind): For structures of 300 tonnes or greater capacity: 2 to 5 days depending on size. For structures of less than 300 tonnes capacity: 2 days


c) With through flow and forced draught (flash-proof fan) operated 2 hours on and 2 hours off: not less than 1 day.


Tobacco: In bales: not less than two days. In cases and hogsheads: not less than 3 days.


Empty Buildings and Enclosures:


a) Without through flow: 5 days


b) With through flow and natural draught (wind): For structures of 300 tonnes or greater capacity: not less than 2 days, depending on structure size, openings and prevailing wind speed. For structures of less than 300 tonnes capacity: 2 days.


c) With through flow and forced draught (flash-proof fan) operated 2 hours on and 2 hours off: 1 to 2 days depending on size of structure.


Fumaphos releases phosphine gas when exposed to air. Phosphine penetrates throughout the commodity to kill eggs, larvae, pupae and adult stages of storage pests in sealed enclosures, but some eggs, pupae and adults will survive in unsealed enclosures (see Note 1 above). Protect by sealing or otherwise, sensitive electrical and electronic equipment (computers, meters, switches, fire alarm systems, etc.) containing copper/copper alloy components, photographic film or copy paper. Phosphine corrodes copper based materials.




Fumigation of Commodities in Silos and Bulk Storages: Place the tablets in a single layer and separated from the commodity e.g. on non-flammable trays/sheets which are evenly spread on the commodity surface inside the storage.

Fumigation of Commodities under Gas Proof Sheeting: Place tablets spaced from each other on non-flammable sheets/trays evenly distributed between and/or alongside stacked commodities in a manner that allows free circulation of gas. Ensure that the sheeting is sealed in a gas-tight manner after application.


Fumigation of empty storages/enclosures: Place tablets spaced from each other on nonflammable sheets/trays evenly spread in the enclosure; with application starting at the furthest point from the exit door. Ensure the enclosure is made gas-tight. Lock and seal exit door after application.


Insecticide Resistance Warning


For insecticide resistance management Fumaphos is a group 8B insecticide. Some naturally occurring insect biotypes resistant to Fumaphos and other Group 8B insecticides may exist through normal genetic variability in any insect population. The resistant individuals can eventually dominate the insect population if Fumaphos or other Group 8B insecticides are used repeatedly. The effectiveness of Fumaphos on resistant individuals could be significantly reduced. Since occurrence of resistant individuals is difficult to detect prior to use, National Fumigants Pty Ltd accepts no liability for any losses that may result from the failure of Fumaphos to control resistant insects. Application of Fumaphos in unsealed storages/ enclosures and use of low dose rates and shortened exposure periods is contrary to label instruction and will contribute to development of resistance.




DO NOT fumigate in inhabited buildings.


DO NOT fumigate in work situations where there is a risk that phosphine gas could leak from fumigation enclosures into working areas.


DO NOT use on commodities, or in empty containers, railcars or vessels that are in transit or likely to be in transit during the Exposure and/or Ventilation Periods.


DO NOT use in road transport vehicles (including a truck or road hauled container).


DO NOT heap tablets. Heaped tablets limit gas release.


DO NOT add water to the tablets.


DO NOT use when the commodity temperature is less than 15C or the relative humidity within the structure is less than 25% or, with raw cereal grains, the moisture content is less than 9%.


DO NOT apply in structures that are not well sealed.


DO NOT apply as a surface-only treatment in a structure whose height exceeds twice its width, unless the structure/enclosure has a gas recirculation device fitted.


Protection of wildlife, fish, crustaceans and environment

This product is highly toxic to wildlife. Dangerous to fish. DO NOT contaminate streams, rivers or waterways with the chemical or used containers.


Safety Directions


Very dangerous. Product releases dangerous phosphine gas slowly in moist air and immediately if wet. Can kill if inhaled or swallowed. DO NOT inhale dust or vapour. Avoid contact with eyes and skin. Open container in the open air. Keep away from water and liquids. Keep away from naked flames. Forms toxic gas. Use the entire contents in one operation; if not possible, seal container thoroughly with waterproof adhesive tape or airtight closure. Wash hands after use. When opening the container or using the product wear elbow length PVC gloves and full face piece respirator with combined dust and gas cartridge (canister) or supplied air respirator. After each days use wash gloves and respirator (if rubber wash with detergent and warm water).



Store Fumaphos in the closed, original container in a cool, dry, well ventilated locked area, out of the reach of children and unauthorised persons and away from all dwellings, animals, food, feedstuffs, seed and fertilisers. DO NOT store or carry container in vehicle cabins (this includes glove compartments, luggage compartments or other common air-spaces). Keep away from water and liquids. Water and many liquids cause immediate release of phosphine from the product. Uncontrolled release of phosphine may result in fire or explosion and release of gas will pose a serious risk of injury to workers and bystanders.



After fumigation with the product on trays/sheets remove the spent tablets and ensure residual phosphide is destroyed before disposal, e.g. by swamping with dilute acid or soapy water in open air until bubbling ceases. Dispose of deactivated residues below 500 mm in an approved disposal pit specifically marked and set up for this purpose, clear of waterways, desirable vegetation and tree roots. Triple rinse the empty containers with soapy water to ensure residual phosphide is destroyed. Dispose of rinsings in an approved disposal pit. Destroy empty containers by breaking, crushing or puncturing them. Dispose of the containers at a local authority landfill. If no local authority landfill is available, bury the containers below 500 mm in an approved disposal pit. DO NOT burn empty containers or product.





Show the following warning sign prominently at all approaches to every fumigation site. "DANGER - POISON GAS - KEEP AWAY"


Keep animals, children and unauthorised persons away from the area under treatment until the area is shown to be free from phosphine as indicated by a gas measuring device.



Containers must be opened in the open air. Whilst opening containers take care and point containers away from the face and body, as under certain conditions possible buildup of gas may result in flash flame upon exposure to air. Application rates higher than label directions and contrary to label instruction could cause the gas concentrations to reach the lower flammability level which is 1.79% by volume (17,900 parts per million). When used according to the label directions, the amount of gas produced remains far below the lower flammability level.


Re-entry Period

After application, wait until the Exposure Period has passed, then thoroughly ventilate for the required Ventilation Period and to the required Standard. Reentry to fumigation areas is not recommended until measuring device(s) indicate that they are free of phosphine. The use of gas detection tubes or other measuring devices is recommended for monitoring gas levels in fumigation areas as phosphine gas may still be present even after treated commodities have been removed and fumigation areas ventilated. DO NOT re-enter a storage after application has commenced or once treated grain/commodity has been emptied without wearing a full face respirator with particulate (P1) and phosphine gas filter cartridge (canister) or self-contained breathing apparatus, until a measuring device indicates that it is free of phosphine or the Total fumigation period (minimum exposure period plus ventilation period) has elapsed.


Product details last updated on 08 Jan 2010


DISCLAIMER: This is not the FUMAPHOS FUMIGATION TABLETS label. To view or print the label for this product, click the "MSDS/Label" tab at the top of this page. Always follow label instructions.


For specialist advice in an EMERGENCY only phone 1800 033 111, TOLL-FREE, ALL-HOURS, NATIONWIDE

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