This unification establishes the methods for determining the residual deformation following localized compression maintained for a given time using a cylindrical indenter. The method is based on determining the depth of imprint that the indenter leaves on the surface of the test piece. 2 The method involves the use of a test tube of defined dimensions and is also applied to finished products that are in the form of a leaf or plate with flat and smooth surfaces.
UNI 5609-1965 history
1965UNI 5609-1965 Elastic materials: testing of vulcanized materials, trace determination