Fire-resistant fluids based on water with 2 to 5% concentrate intended to give the water a minimum level of protection against corrosion and wear.
Depending on the composition of the concentrate,
- emulsions of every kind (HFAE) are produced, including micro-emulsion with mineral or synthetic oil, or a
- solution (HFAS). Concentrates for solutions are completely oil-free and more environmentally friendly in general.
High Water Based Fluids (HWBF) fluids have the same viscosity as water and may only be used between +5°C and +55°C. They have no standardised characteristics, since locally available water is used in each case and the respective user is responsible for mixing the concentrate in.
"Thickened water" fluids based on HWBF whereby certain polymers ("water thickeners") are molecularly dispersed in water at a rate of 5—10%, resulting in a viscosity of 30 to 45 mm2/s at 20°C and 16 to 22 mm2/s at 50°C.
The water content must be monitored.