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Breather cloth is a 100% non-woven polyester fabric that is designed to allow airflow throughout the vacuum bagging process as well as bleed out an excess resin.
Breather cloth's function is to allow air and volatiles to be removed within the vacuum bag and across the corner of the laminate or the mould. It is a very useful material in vacuum bagging and helps in maintaining the vacuum throughout the mould during the process.