Jump to main content.


Q: I noticed that this version of the Pesticide Inert Risk Assessment Tool (PIRAT) is a Beta-version. How should I send feedback?

A: You are correct that this version of PIRAT is a beta or test version, and it is scheduled for a formal peer review in 2004. We encourage you to please send any comments you may have on this tool to:

Thomas Brennan
1200 Pennsylvania Avenue, N.W.
Washington, DC 20460
Mail Code 7508C
Phone (703) 306-0540
E-mail:Thomas Brennan

Q: What is a Pesticide Inert?

A: Pesticide products contain both "active" and "inert" ingredients. The terms "active ingredient" and "inert ingredient" have been defined by Federal law, the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), since 1947. An active ingredient is one that prevents, destroys, repels or mitigates a pest, or is a plant regulator, defoliant, desiccant or nitrogen stabilizer. By law, the active ingredient must be identified by name on the label together with its percentage by weight. An inert ingredient is simply any ingredient in the product that is not intended to affect a target pest. For example, isopropyl alcohol may be an active ingredient and antimicrobial pesticide in some products; however, in other products, it is used as a solvent and may be considered an inert ingredient. The law does not require inert ingredients to be identified by name and percentage on the label, but the total percentage of such ingredients must be declared. To learn more about pesticide inert ingredients please go to the following link:

Inert Ingredients in Pesticide Products

Q: What is the weight fractions database?

A: PIRAT contains data on inert ingredients and a stand alone inert ingredient weight fraction database is also available for download from this site. In PIRAT, data are sorted according to formulation type and functional use category, and statistical analyses were conducted to generate distributions of weight fraction values for various categories. By contract the weight fractions database, an Excel database file, has this data in its raw form for users to consider.


Local Navigation

Jump to main content.