Next-Gen Aerial Retardant

FORTRESS FR-105 HV Dry Bulk Aerial LTR

FORTRESS FR-105 HV is our next-gen iteration on the FORTRESS FR-100 aerial dry powder long-term retardant, with a medium viscosity rating and high-visibility (HV) fluorescent coloring. FORTRESS FR-105 HV brings new features to the frontlines of firefighting, and further improves on the environmental and safety profile of its predecessor. FORTRESS FR-105 HV has successfully completed all of the required US Forest Service Laboratory tests for fire retardancy effectiveness, toxicity, anti-corrosion, stability, and viscosity. The operational field evaluation (OFE) initiated in the 2022 fire season and will be the final step in obtaining USFS certification.

FORTRESS FR-105 HV features our unique magnesium chloride formulation, which means that it's more effective, safer for the environment, and more durable than conventional, fertilizer-based retardants.

FORTRESS FR-105 HV Retardant properties

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Fully Qualified, Listed on USFS QPL

Exceeded performance standards on every official USFS lab test.

Dry Powder Concentrate

Designed for dry bulk storage and dry base operations.

Aerial Optimized

Engineered for stronger fire barriers and superior fire control. Qualified for use with large airtankers, Very Large Air Tankers (VLATs), Single Engine Air Tankers (SEATS), and helicopters.

Medium Viscosity

Gum-thickened medium viscosity for improved drop characteristics.

High-Visibility Fluorescent Fugitive Coloring

Provides higher visibility during the day and at night, and fades over time when exposed to sunlight.

Hygroscopic Recharge

Self-hydrating when humidity exceeds 33%, enabling better fuel coverage, more effective fire suppression, and extended durability.


Not a fertilizer, does not contribute to the growth of flammable vegetation or freshwater eutrophication, does not contain any biocides, and is significantly less toxic to fish. FR-105 HV has the lowest aquatic toxicity rating of any dry powder fire retardant.

Corrosion Inhibited

Corrosion inhibitor package minimizes corrosion on steel, brass and aluminum, making it safe for use around steel utility infrastructure.

FORTRESS FR-200 Liquid Aerial LTR >
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