scope:

This European Standard specifies a test method for determining the mechanical viscoelastic properties of interlayer materials. The interlayers under examination are those used in the production of laminated glass and/or laminated safety glass. The interlayer properties are needed in order to determine the load resistance of laminated glass as part of a general calculation method for the load resistance of glass. NOTE CEN/TC 129/WG 8 ""Mechanical strength"" is preparing a draft for the calculation method [1]. From the tensile modulus in particular conditions of temperature and load duration, an interlayer can be placed into a family that relates to a specific interlayer shear transfer coefficient, [omega]. This value can be used in a simplified calculation method. An informative annex explains the background to the determination of families relating to a specific interlayer shear transfer coefficient.