DIN 16742 | Plastics moulded parts - Tolerances and acceptance conditions; Text in German and English.

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Description :

This standard applies for the definition of possible manufacturing tolerances for plastic moulded parts. It applies exclusively for new designs from the date of issue of this standard.

It involves limit dimensions for size dimensions (two-point dimensions) as indirect tolerancing (general tolerances) and as direct tolerancing (indication of deviation at nominal size dimension).

For tolerancing of form deviation and positional deviation, profile form tolerances act as general tolerances and position tolerances for the direct tolerancing by cylindrical tolerance zone.

Procedural basis of this standard are original mould methods with closed tools such as injection moulding, injection compression moulding, transfer moulding and compression moulding of non-porous moulded parts made from thermoplastics, thermoplastic elastomers and thermosets as well as rotational moulding of thermoplastics. An analogous application of the standard is possible for special process variants, if this was agreed with the moulded part manufacturer.

Porous moulded parts (e. g. cellular plastics) as well as other moulding and processing methods do not belong to the scope of this standard. The same applies for process combinations from the original mould and forming methods (e. g. injection moulding blowing). Permissible tolerances are to be agreed for porous moulding materials.

If tolerances are required beyond the scope of the standard, these shall be agreed with the moulded part manufacturer and specified on the drawing.

Deviations from the moulded part surface quality such as sink marks, undesired flow structures and roughness as well as joint lines are not an object of this standard.