Bergeson & Campbell, P.C. serves small, medium, and large pesticide product registrants and other stakeholders in the agricultural and biocidal sectors, in virtually every aspect of pesticide law, policy, science, and regulation.

By Lisa M. Campbell, Timothy D. Backstrom, and Carla N. Hutton

The U.S. Environmental Protection Agency (EPA) announced on July 2, 2020, that it has registered NSPW Nanosilver (a new nanosilver formulation) to suppress odor-causing bacteria and algae, fungus, mold, and mildew that can cause deterioration or staining in textiles.  Textiles that may be treated with NSPW Nanosilver include fabrics, sportswear, footwear, linens, and awnings.  NSPW Nanosilver is the active ingredient in the pesticide product POLYGUARD-NSPW MASTER BATCH (Polyguard).  The NSPW Nanosilver in Polyguard will be embedded within beads or pellets of a polymeric material in a “master batch,” and these beads of pellets will then be incorporated into treated textiles through a closed-loop manufacturing process.  EPA states that once the beads or pellets containing NSPW Nanosilver are introduced into this manufacturing process, no beads or pellets can escape into the environment.  EPA also states that the available data indicate that the leach rate of nanosilver from NSPW Nanosilver-treated textiles is below the limit of detection.

The same type of nanosilver was the active ingredient in another product that EPA previously conditionally registered under FIFRA Section 3(c)(7)(C) in 2015.  The U.S. Court of Appeals for the Ninth Circuit issued a decision vacating that conditional registration because the court concluded that the mandatory public interest finding by EPA was not adequately supported by the administrative record.  According to EPA, the new registration for NSPW Nanosilver involves a modified use pattern that will limit exposures compared to the product that received the previously vacated conditional registration.  Based on additional data that the applicant has submitted to support the use pattern as modified, EPA has prepared an updated risk assessment for NSPW Nanosilver and has determined based on that risk assessment that the product as modified meets the standard for an unconditional registration under FIFRA Section 3(c)(5).  Materials supporting this action will be posted in Docket ID EPA-HQ-OPP-2020-0043.

Commentary

Registering any new metallic silver product that satisfies the EPA criteria for classification as nanosilver for use as an antimicrobial pesticide presents special challenges, because EPA has adopted a policy that it will construe each new nanosilver product as a new pesticidal active ingredient.  The predecessor to NSPW Nanosilver (Nanosilva) was granted a conditional registration, a procedure that EPA uses when there are data gaps that must be filled before EPA is ready to make the determinations that would support issuance of an unconditional registration.  EPA may only issue a conditional registration for a product containing a new pesticidal active ingredient when EPA makes a determination that “use of the pesticide is in the public interest,” and the Ninth Circuit Court determined that EPA did not compile an administrative record adequate to support that finding.

Colloidal metallic silver products that meet the definition of nanosilver were first synthesized in the late 19th century.  Some industry stakeholders question whether the differences between different pesticide products that satisfy the EPA definition of nanosilver are sufficiently great to treat each new product as a new active ingredient, but it is also clear that the size and shape of the particles in these products do vary.  In this instance, EPA has determined that the supporting data for the application allow EPA to issue an unconditional registration.  Accordingly, the legal issue on which the Ninth Circuit based its prior decision to vacate the conditional registration for Nanosilva is not pertinent to the current registration decision.  Given the challenge to the prior registration decision, it will be important to monitor any opposition to the newly issued registration.


 

By Lynn L. Bergeson and Carla N. Hutton

As reported in our February 13, 2020 blog item, the U.S. Environmental Protection Agency (EPA) announced on February 12, 2020, that it is seeking public input on a proposal to incorporate a new nanosilver pesticide product into textiles to combat odors, discoloration, and other signs of wear.  The proposed registration decision is for NSPW Nanosilver, and the proposed pesticide product, Polyguard-NSPW Master Batch (Polyguard), will be incorporated into textiles to suppress bacteria, algae, fungus, mold, and mildew, which cause odors, discoloration, stains, and deterioration.  According to EPA, based on its human health and ecological risk assessment, it has preliminarily determined that the new active ingredient in Polyguard meets the regulatory standard under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) for use as a materials preservative in textiles.  According to a February 27, 2020, memorandum placed in Docket ID EPA-HQ-OPP-2020-0043, EPA received a request to extend the comment period 30 days to allow additional time to review the documentation contained in the docket.  The memorandum states that EPA “feels that 15 additional days should be sufficient to allow for adequate review of the Proposed Decision and supporting documentation.”  Comments are now due March 30, 2020.


 

By Lynn L. Bergeson and Carla N. Hutton

The U.S. Environmental Protection Agency (EPA) announced on February 12, 2020, that it is seeking public input on a proposal to incorporate a new nanosilver pesticide product into textiles to combat odors, discoloration, and other signs of wear.  The proposed registration decision is for NSPW Nanosilver, and the proposed pesticide product, Polyguard-NSPW Master Batch (Polyguard), will be incorporated into textiles to suppress bacteria, algae, fungus, mold, and mildew, which cause odors, discoloration, stains, and deterioration.  According to EPA, based on its human health and ecological risk assessment, it has preliminarily determined that the new active ingredient in Polyguard meets the regulatory standard under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) for use as a materials preservative in textiles.  EPA invites public comment on its proposal and preliminary findings.  Comments are due March 13, 2020.  More information is available in Docket ID EPA-HQ-OPP-2020-0043

EPA notes that NSPW Nanosilver was the active ingredient in a previous conditional registration that it granted in 2015, for use as a materials preservative in textiles and plastics.  As reported in our May 31, 2017, memorandum, that decision was challenged, and the U.S. Court of Appeals for the Ninth Circuit “vacated it on grounds that EPA’s public interest finding for granting the registration was without support in the record.”  EPA states that the currently proposed product “is solely for use in specified textiles; therefore, Polyguard will have a more limited use authorization than the previously vacated conditional registration.”  EPA notes that Polyguard will be formulated as a master batch, meaning that NSPW Nanosilver would be embedded within plastic beads or pellets, in contrast to the previous product registration, which was in the form of a liquid suspension.