Water-containing hydraulic fluids represent the largest and most widely used type segment in the fire-resistant hydraulic fluid market, commanding the dominant share due to their widespread industrial application, cost-effectiveness, and effective cooling and lubrication properties. These fluids are primarily favored in sectors where fire safety is crucial, thus holding a significant share of the market.

Water-containing hydraulic fluids are classified under the ISO 6743-4 standard as HFA, HFB, and HFC types. HFA fluids are oil-in-water emulsions containing typically 95% water and 5% oil concentrate, offering excellent fire resistance but limited lubrication properties. HFB fluids are water-in-oil emulsions containing approximately 40% water, providing a balance of fire resistance and lubrication. HFC fluids are water-glycol solutions containing 35-50% water, offering good fire resistance, lubrication, and anti-wear properties. These fluids are typically classified as "FM Approved" products by FM Global, the leading commercial property insurer, confirming their fire-resistant performance.

Water-containing fluids are the dominant choice in the fire-resistant hydraulic fluid market, known for their effective cooling and lubrication properties. They are typically used in industries such as metalworking and construction, where safety and performance are paramount. The global water-based hydraulic oil market was valued at approximately $1.168 billion in 2025 and is projected to reach $1.515 billion by 2032, growing at a CAGR of 3.9%. Key players in this segment include TotalEnergies, Quaker Houghton, ExxonMobil, Kodiak, Fluid Competence, Bosch Rexroth, and Parker Hannifin.

The dominance of water-containing fluids is expected to continue, supported by their cost-effectiveness, proven performance, and broad availability. However, the segment faces growing competition from water-free fluids, which offer enhanced performance and longer fluid life in demanding applications. Manufacturers are investing in advanced formulations that improve the lubrication properties and thermal stability of water-containing fluids, expanding their application scope and enhancing their competitiveness in the market.

For more information on water-containing hydraulic fluids, visit Fire-Resistant Hydraulic Fluid Market Report.