Viscosity is a measure of the thickness or internal friction of a liquid. It describes how much a liquid resists deformation or flow. Simply put: the higher the viscosity, the “thicker” the liquid – and the lower the viscosity, the more “fluid” or “runny” it is.

Most fluorine-free foam extinguishing agents are low-viscose, meaning they have a thin, water-like consistency and can be easily proportioned.

An exception is alcohol-resistant foam concentrate, such as vaPUREx®-AR (AR = Alcohol Resistant). The alcohol-resistant components increase the viscosity.

The terms low-viscosity and high-viscosity are not uniformly defined for foam concentrates. At Dr. STHAMER, we refer to products as low-viscose if they show water-like flow behavior even at lower temperatures and are easy to proportion. This applies, for example, to vaPUREx®-FXS PLY, vaPUREx®-LV, as well as all products from the STHAMEX® range.