Definition: ISO (International Organization for Standardization) is a worldwide standardisation body for the development of internationally valid standards. ISO standards govern terminology, testing methods, management systems and technical requirements.
Practical relevance: Examples include ISO 9001 (quality management), ISO 4287 (roughness) or ISO 9712 (NDT personnel). ISO standards promote international comparability and market access.
Definition: ISO 25178 is an international series of standards for three-dimensional areal surface measurement. It defines 3D parameters such as Sa, Sz and Ssk. It is based on optical or tactile 3D measuring systems.
Practical relevance: The standard extends profile-based roughness analysis (ISO 4287) with areal parameters. It is relevant for tribological, functional and microstructured surfaces.
Definition: ISO 4287 defines roughness parameters for profile-based surface measurements. It describes parameters such as Ra, Rz or Rt and their mathematical determination. The standard is the basis of tactile roughness measurement.
Practical relevance: ISO 4287 specifies terms and calculation rules for profile parameters. In combination with ISO 16610, filters are applied. The standard is widely used in mechanical engineering and manufacturing.
