Synthetic Fire-Resistant Fluids

Synthetic Fire-Resistant Fluids

Synthetic fire-resistant fluids: Three types of synthetic fire-resistant fluids are manufactured: phosphate esters, chlorinated (halogenated) hydrocarbons, and synthetic base (a mixture of these two). These fluids do not contain water or volatile materials, and they provide satisfactory operation at high temperatures without loss of essential elements (in contrast to water-based fluids). The fluids are also suitable for high-pressure applications. Synthetic fluids have a low viscosity index, anywhere from 80 to - 400, so their use should be restricted to relatively constant operating temperatures. When required to operate at low temperatures, these fluids may require auxiliary heating. Synthetic fluids also have high specific gravities so pump inlet conditions must be carefully selected to prevent cavitation. Phosphate esters have flash points above 204C (400F) and auto-ignition temperatures above 483C (900F), making these fluids less likely to ignite and sustain burning. Halogenated hydrocarbon fluids are inert, odorless, nonflammable, noncorrosive, and have low toxicity. Seal compatibility is very important when using synthetic fluids. Most commonly used seals such as Nitrile (Buna) and Neoprene are not compatible with these fluids.