PA 66 is used in smaller dimensioned applications and offers higher rigidity and wear resistance compared to PA 6. PA 66 shows comparable continuous high working temperature range. Compared to the cast varieties, this material also has higher water absorption. Regarding the other properties, PA 66 is comparable to the standard cast type PA 6 G, however it is much more costly. As in the case of PA 6, the manufacturing process limits the size and unit weight which can be produced, and this restricts the design possibilities of the user. Therefore PA 66 in practical application is replaced to a large extent by the more economical PA 6 G, which can also be produced in almost unlimited sizes.