DIN ISO 20457 / DIN 16742 (PolTolerances 3.x) Application and decision aids Tolerance principles and recommendations scope of application Definition equations for processing shrinkage Causes and influencing factors on the processing shrinkage (VS) of non-porous plastics Tool binding of the moulded part dimensions Testing and structuring of the stiffness/hardness level of polymers without solid additives Notes on the classification of tolerance groups according to process and moulding compound Nominal sizes definitions Dimensional reference planes, causes of dimensional changes and moulded part acceptance conditions Notes on the classification of the tolerance series