Wettable Powders WPs

When the data in Table 4 were given full evaluation, it was recommended that the 50W formulation of chlorpyrifos no longer be marketed in bags that allowed significant exposure for mixer-loaders of this product. This product was removed from the marketplace and was replaced with one in which the wettable powder (WP) is in water-dissolvable packets. Exposure data on other active ingredients have clearly demonstrated reduced exposure with this type of packaging. The other uses were deemed to present a minimal hazard to users, and only minor protective measures have been recommended to workers. 

Today one the most common insecticidal surface treatments is the pyrethroid insecticide cyfluthrin (Tempo). It is available as an emulsifiable concentrate (EC) or as a wettable powder (WP), but the WP is much more... 

The spray rig testing resulted in the use directions which are now part of the BALAN Dry Flowable label Fill the tank three-fourths full with clean water. Start agitation and increase pump speed to operating pressure. Add BALAN Dry Flowable, then add other dry flowables, wettable powders (WP), aqueous suspensions (AS), flowables (F), liquids (L), solutions (S), and emulsifiable or liquid concentrates (EC or LC) in this order to the water and agitate continuously until the product(s) are completey dispersed in the water. 

The nnderlying database of exposnres is presented in Lundehn et al. (1992). The size of the database varies, and is relatively small (n < 15) for mixing/loading of wettable powders (WPs) and wettable granules (WGs). The database for downward spraying with tractor-mounted equipment is also rather small (n < 20). The studies in the database were carried out by industry for registration purposes. 

Wettable powder (WP) Vehicle-mounted (all types) Hand-held (all types) Hands Dermal (body and hands) Inhalation Hands Dermal (body and hands) Inhalation 100 (indicative) 100 (indicative) 1 (indicative) No good data No data No good data... 

To illustrate previous comments, an attempt was made to compare estimated exposure levels of the different databases using one scenario, i.e. the downward groundboom application of a wettable powder (WP) formulation. In order to compare the outputs, specific input data must be selected. The input data presented in Table 5.13 for the identified scenario are considered to be a reasonable representation for all European databases. 

Residue Remaining After Laundering. The laundry process removed a mean of 80% to 99% MeP (Table I). Residues were lower for encapsulated (ENC) and wettable powder (WP) formulations, with ranges of 1% to 7% MeP residue. Bnulslfiable concentrate (EC) MeP residues were higher, ranging from 12% to 20%, indicating that EC formulation apparently was more difficult to remove. 

Applications of Dithiopyr to paddy grown Oryza are targeted to control Echino-chloa spp. Dithiopyr can be formulated into several different formulations, including an emulsion in water (EW) containing 240 g a.i. an emulsifiable concentrate (EC) up to 120 g a.i. and a wettable powder (WP) with 40% a.i. In addition, granular formulations are available. 

Most agrochemicals are water-insoluble compounds with various physical properties, which have first to be determined to decide on the type of formulation. Accurate physical data on the compound is essential, such as its solubility, its lipophilic character and its chemical stability. One of the earliest types of formulations is wettable powders (WP), which are suitable for formulating solid water-insoluble compounds that can be produced in a powder form. The chemical (which may be micronised) is mixed with a filler, such as china clay and a solid surfactant, such as sodium alkyl or alkyl aryl sulphate or sulphonate, is added. When the... 

An adult male swallowed an estimated 1000 g of a 50% wettable powder (WP) formulation. The man vomited and was found in a worried state. His family took him to an emergency facility where atropine (therapy for phosphoric ester insecticide poisoning) was administered. The patient was then transferred to the hospital where he was successfully treated for atropine poisoning. The hospital diagnosed no other signs requiring therapy. 

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