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Composite properties derrived from tests above depend on the quality of the composite layup. One of the most important parameters to measure the quality of the composite part is void content. The density of the voids in the composite can affect many properties of the composite, especially the transverse properties of a unidirectional composite. This void content can be used as a score of how well the layup turned out, and different manufacturing methods can be compared. Void content should be kept below 1% for a good composite, and it is discouraged to use composites with a void content of >5% for critical applications. This number can be measured by following ASTM standard D2734-16, attached to this page.
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