Liquid silicone rubber (LSR) has good chemical and physical properties, in particular, it is biocompatible and weatherproof and it can be used between -50 °C and 200 °C. It is used in the automotive sector, for households, babycare and medical devices. However, it is more expensive than other elastomers. For this reason, the density should be reduced to get lower the price of parts. By producing LSR foams, the density can be reduced to below 1 g/cm³. Besides, the haptics of the components and the thermal insulation properties are improved.

LSR is processed by liquid injection molding (LIM). Due to this processing method, the blowing agent has to expand inside the hot mold (150 °C up to 200 °C) to create the foam structure. A possible blowing agent is water, which can be mixed in the uncured LSR before the injection molding process. The cell structure with water as a blowing agent is very inhomogeneous because there are unfoamed areas and foamed areas. This structure can be influenced by the mold temperature and it can be improved by adding an additive to the water.