Flexible cooling water hose for motor vehicles comprising extruded tube of several plastics layers

摘要

Cooling water for motor vehicles passes through a flexible hose consisting of several plastic layers (1,2,3), of which the inner layer is of polyvinylidene fluoride. The inner layer is pref. surrounded by an adhesion promoting layer of the same material, which is in turn surrounded by an outer layer of polyamide. Pref. polyamides are PA 11 and PA 12.