Infrastructure Defense

FORTRESS FR-700 Structural Retardant

FORTRESS FR-700 is our liquid concentrate long-term retardant specifically designed for structural defense. This product 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. This product is fully qualified by the USFS (United States Forest Service).

FORTRESS FR-700 is similar to our Forest Service qualified FORTRESS FR-600 formulation, but it features a higher salt content for improved fire shielding, and a higher viscosity mix to adhere to structural surfaces like fences, decks, siding, and roofs. FR-700 is applied directly to infrastructure and remains effective throughout the fire season. When needed, it can be easily washed off with a hose and leaves no residue. This product is available in a clear, colorless formulation or in a high-visibility fugitive coloring to suit your needs.

FORTRESS FR-700 Retardant properties

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Fully Qualified with USFS

Approved by the USFS and listed on the Qualified Products List.

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Commercially Available

FR-700 is on market and approved for purchase and application.

Liquid Concentrate

Designed for wet concentrate storage.

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More Active Ingredient

Higher salt content to better stop ignitions and fire spread, and maximize longevity. Developed for long-term pretreatment of structural surfaces.

Purpose-Built For Structural Defense

Engineered for stronger fire barriers and superior infrastructure defense. Formulation optimized for direct application onto structural surfaces.

Medium Viscosity

Gum-thickened medium viscosity to adhere to vertical surfaces, forming a barrier that directly shields structures from fire.

Optional Fugitive Coloring

Product available in clear formulation or pink fugitive coloring. 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 35%, 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.

Corrosion Inhibited

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

Learn more about FORTRESS FR-700 in the video below, where we explain what makes Fortress fire retardants more effective, more environmentally friendly, and best-suited to protect your property.

See first hand how effective Fortress products are as the reporting team from KCRA-TV Sacramento puts them to the test on flammable fences and fuels.

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