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Hammer 400 EC



APVMA code:   63228/115135

Active Constituent(s):

400 g/L carfentrazone-ethyl

solvent: 466 g/L liquid hydrocarbon 

Registered For:


 Commercial use

 Domestic use


For improvement in the control of Marshmallow and certain other broadleaf weeds prior to establishment of broadacre crops, Fallows or Forest plantations, in commercial, industrial and public service areas, and around Agricultural buildings and yards, in Treefruits, Nuts, Grapevines in tank mixture with knockdown herbicides; for the control of Marshmallow  and Annual nettles in Grass pastures and Rough grass/turf areas; and control of Volunteer cotton seedlings including Roundup Ready* cotton and desiccation of Cotton re-growth as per the Directions For Use Table.


  SDS  (90 KB)

  Label  (210 KB) 

General Instructions

Hammer®400EC Herbicide is an emulsifiable concentrate formulation and is to be mixed with water and applied as per the labelled Directions for Use.

Hammer 400EC is a post-emergence herbicide to be added to knockdown herbicides to improve the control of certain broadleaf weeds including marshmallow prior to the establishment of fallows, winter and summer broadacre crops, marshmallow control in grass pastures, in commercial, industrial and public service areas, around agricultural buildings, yards and other farm situations. Hammer 400EC can be used alone with a suitable adjuvant for control of volunteer cotton seedlings including Roundup Ready cotton. It can also be used for desiccation of regrowth in cotton. Hammer 400EC is a fast acting contact herbicide and aids in control of weeds through a process of membrane disruption. The foliar uptake of Hammer 400EC is rapid and plant desiccation can occur within 4 days of application. Application of Hammer 400EC should target small actively growing weeds. Subsequent germinations will not be controlled.



DO NOT apply by aerial application except for cotton desiccation.


Withholding Period









EXPORT SLAUGHTER INTERVAL (ESI): An export slaughter interval is not required when used as directed.



Hammer 400EC is rapidly absorbed through the foliage of plants. Within a few hours following application, the foliage of susceptible weeds show signs of desiccation, and in subsequent days necrosis and death of the plant. Extremes in environmental conditions eg. temperature and moisture, soil conditions and cultural practices may affect the activity of Hammer 400EC. Under warm moist conditions, herbicide symptoms may be accelerated. While under very dry conditions, the expression of herbicidal symptoms is delayed, and weeds hardened off by drought are less susceptible to Hammer 400EC.



For most uses as per the Directions for Use Hammer 400EC should always be tank mixed with formulations of knockdown herbicides including Gladiator*, Roundup* Power Max, Roundup* CT, Credit*/Bonus* or other products based on glyphosate, Spray.Seed*, Shirquat*, Nuquat* or other knockdown herbicides based on paraquat and Basta*. Hammer 400EC is also compatible with partner herbicides commonly used with knockdown herbicides including Atradex*, atrazine SC, Banvel* 200, 2,4-D amine, 2,4-D ester, Logran* (triasulfuron), pendimethalin, Simagranz*, simazine SC, TriflurX* and Treflan* (trifluralin). This compatibility claim is restricted to a three-way mix of Hammer 400EC with any one of the above partner herbicides plus a knockdown herbicide (provided the knockdown herbicide label includes a claim of compatibility with that partner herbicide). Hammer 400EC is compatible with non ionic surfactants (wetting agents) such as BS1000*, Shirwet* 600 and with oil adjuvants including Supercharge* and Hasten*.


Resistant Weeds Warning

Hammer 400EC Herbicide is a member of the Aryl triazoline group of herbicides. Its mode of action is through a process of membrane disruption, which is initiated by the inhibition of the enzyme protoporphyrinogen oxidase. This inhibition interferes with the chlorophyll biosynthetic pathway. For weed resistance management Hammer 400EC is a Group G herbicide. Some naturally occurring weed biotypes resistant to Hammer 400EC and other Group G herbicides may exist through normal genetic variability in any weed population. The resistant individuals can eventually dominate the weed population if these herbicides are used repeatedly. These resistant weeds will not be controlled by Hammer 400EC or other Group G herbicides. Since the occurrence of resistant weeds is difficult to detect prior to use, FMC Crop Protection Pty Ltd accepts no liability for any losses that may result from the failure of Hammer 400EC to control resistant weeds.



Pre-crop, Volunteer cotton and Marshmallow in grass pastures

Application should be made to small, actively growing weeds less than 6 to 8 leaf in stage. As Hammer 400EC is a contact herbicide, best control is achieved when weeds are exposed and are not shielded by other weeds and or stubble.



If cotton re-growth occurs after the initial defoliation program, apply Hammer 400EC to desiccate re-growth prior to harvest.



Add half the required volume of water to spray tank and start agitation. Add any partner SC or WG herbicide next if it should be added before an EC or knockdown herbicide. Add the measured amount of Hammer 400EC next, followed by the knockdown herbicide (if required). Add balance of water to tank and add any adjuvant or additive if recommended for use with the knockdown herbicide or for use in grapevines or as suggested in the Critical Comments. Maintain good agitation at all times until spraying is completed. DO NOT store spray mixture overnight.



DO NOT apply by aerial application except for cotton desiccation.


Ground sprayers


Pre-crop, Volunteer cotton and Marshmallow in grass pastures:

Apply Hammer 400EC as a broadcast application using a conventional boom sprayer with either mechanical or by-pass agitation.

Use single orifice flat fan nozzles such as Spraying Systems TeeJet* 11001, 110015, 11002 or equivalent sizes from other manufacturers or Spraying Systems TwinJet* twin flat spray tips TJ60-11002, TJ60-11003 or TJ60-11004 or equivalent sizes from other manufacturers. DO NOT use 110-03 or bigger single orifice nozzles or TJ11006 or bigger twin orifice nozzles with Hammer®400EC. DO NOT use floodjet, boomless jets or misters or controlled droplet application equipment. 

Spray equipment should be properly calibrated to ensure correct and uniform application. Use a spray volume of 50 to 150 litres per hectare (minimum 80 L/ha for volunteer cotton). Experience has shown that increasing spray volumes can improve weed control. Use the lowest pressure and boom height which provides uniform coverage. Use the higher volume if weed infestation is heavy and/or tall. The best application conditions are when soil is moist, weather fine and rain unlikely within one hour or as specified for the knockdown herbicide. 

Extremes in environmental conditions eg. temperature and moisture, soil conditions and/or cultural practices may affect the activity of Hammer 400EC. Under warm moist conditions, herbicide symptoms may be accelerated. While under very dry conditions, the expression of herbicidal symptoms is delayed, and weeds hardened off by drought are less susceptible to Hammer 400EC.



When desiccation cotton regrowth, use sufficient water to obtain complete coverage of all leaves, ie. at least 100 litres of water per hectare. Good coverage should be obtained with three or more nozzles per row depending upon crop height and canopy density.


Knapsack, Pneumatic, Handgun sprayers

Apply Hammer 400EC at the recommended rate of 6 mL per 100 litres in conjunction with labelled handgun rates of a knockdown herbicide in sufficient water to adequately and uniformly wet the foliage of the weeds being sprayed. A spray volume of 500 L to 1000 L will usually be sufficient but higher volumes may be required for dense taller vegetation.


Aerial Application (for Cotton Desiccation Only)

Apply by fixed wing aircraft in a minimum of 30 L/ha water and ensure thorough coverage. DO NOT exaggerate swath width.


Sprayer Clean Out - After the Use of Hammer 400 EC

Thoroughly clean all spray equipment using the following procedure when you have finished spraying highly active materials such as carfentrazone-ethyl. 

In addition to the following procedure, ensure proper equipment clean-out for any other products mixed with Hammer 400EC Herbicide as specified on the other product labels.



More complete cleaning can be achieved if the spray equipment is cleaned immediately following each use.

Mix only as much herbicide spray solution as needed at a time.

DO NOTstore the sprayer for any extended period of time, especially over night, with Hammer®400EC Herbicide spray solution remaining in the tank, spray lines, spray boom plumbing, spray nozzles or strainers.


Preparation of the Cleaning Solution:

Prepare a spray equipment cleaning solution by mixing an alkaline detergent eg “OMO” or “SPREE” at a rate of 100g for every 100L of clean water used.

Upon completion of applying Hammer 400EC and before spraying sensitive crops including canola, pulses such as faba beans, lentils, other legumes and cotton:


1.   Fill the spray tank with sufficient cleaning solution to allow the operation of the spray system for a minimum of 15 minutes to thoroughly flush hoses, spray boom and spray nozzles then fill the spray tank to capacity to ensure contact of the solution with all internal surfaces. Let the cleaning solution soak in tank, pump and spray lines overnight.
2.  Before further use of the sprayer, operate the spray system for 15 minutes, then completely drain the sprayer system. Rinse the tank with clean water and flush through the hoses, spray boom, and spray nozzles.
3.  If possible spray a pesticide requiring an oil adjuvant eg Achieve & Supercharge onto cereals as a further means of removing possible residues of Hammer®400EC before spraying sensitive crops.
4.   Immediately prior to commencement of spraying a sensitive crop, purge the boom lines by operating the spray system onto a fence line or waste area for sufficient time to remove any solution that has been residing in the spray lines. This is also recommended for subsequent tank loads or if the sprayer has been left standing for a period of time containing spray solution.
5.  If storing equipment for more than 48 hours, preferred practice is to clean spray equipment as outlined above allowing to soak over night, drain and flush with fresh water and leave fresh water in the spray tank, hoses, and spray booms until next use. This water must be drained from the spray boom and lines and flushed out with clean water before beginning any application to a sensitive crop.


Properly dispose of all cleaning solution and rinsate safely in accordance with Federal, State, and local regulations and guidelines.

DO NOT apply sprayer cleaning solutions or rinsate to sensitive crops.

Should small quantities of Hammer 400EC remain in inadequately cleaned mixing, loading and/or spray equipment, they may be released during subsequent applications potentially causing effects to sensitive crops and other vegetation.

The above method is only effective if the cleaning solution comes into contact with every surface or contact point that may contain even minute carfentrazone-ethyl residues.


Crop Plant Back & Rotation Recommendations

Hammer 400EC Herbicide does not provide residual activity, therefore no crop plant back or rotational restrictions apply. However, check the label of any product mixed with Hammer 400EC Herbicide, to determine any plant back periods or restrictions on use.



DO NOTallow entry into treated areas until the spray has dried, unless wearing cotton overalls buttoned to the neck and wrist (or equivalent clothing) and chemical resistant gloves. Clothing must be laundered after each day’s use.


Protection of Crops, Native and other Non-Target Plants

DO NOT apply under weather conditions, or from spray equipment, which may cause spray drift onto nearby susceptible plants, adjacent crops, or pastures, or onto wetlands, waterbodies or watercourses.


Protection of Wildlife, Fish, Crustaceans and Environment

Highly toxic to algae and aquatic plants. DO NOT contaminate streams, rivers or waterways with Hammer 400EC or used container.


Storage and Disposal

Store in the closed, original container in a cool, well-ventilated area. DO NOT store for prolonged periods in direct sunlight. 

Triple-rinse containers before disposal. Add rinsings to spray tank. DO NOT dispose of undiluted chemicals on site. If recycling, replace cap and return clean containers to recycler or designated collection point. If not recycling, break, crush, or puncture and deliver empty packaging to an approved waste management facility. If an approved waste management facility is not available, bury the empty packaging 500 mm below the surface in a disposal pit specifically marked and set up for this purpose, clear of waterways, desirable vegetation and tree roots, in compliance with relevant local, state or territory government regulations. DO NOT burn empty containers or product.


Safety Directions

Harmful if inhaled. May irritate the nose and throat. Will irritate the eyes and skin. Repeated exposure may cause allergic disorders. Avoid contact with eyes and skin. DO NOT inhale vapour or spray mist. When preparing the product for use and using the product wear elbow length chemical resistant gloves. When opening the container, mixing and loading and preparing spray, wear cotton overalls, over normal clothing, buttoned to the neck and wrist and face shield or goggles. If applying by hand wear cotton overalls, over normal clothing, buttoned to the neck and wrist and face shield or goggles. If product on skin, immediately wash area with soap and water. If product in eyes, wash it out immediately with water. Wash hands after use. After each day’s use, wash gloves, face shield or goggles and contaminated clothing.


DISCLAIMER: This is not the HAMMER 400 EC 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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