BELSIL® WO 3700 is a non-ionic emulsifier suitable for water in oil (W/O) and water in silicone (W/Si) formulations. BELSIL® WO 3700 is based on a polymeric polydimethylsiloxane which is functionalized with polyether groups as well as with alkyl groups. Due to its special structure, the product ensures a good emulsion stability. BELSIL® WO 3700 appears as an almost colourless medium-viscose liquid. The calculated HLB value (hydrophilic-lipophilic balance) of BELSIL® WO 3700 is approximately 3.