Our Bleeder/ breather cloth is a woven polyester fabric that is used during vacuum infusion to allow for the even removal of air from a vacuum bagged composite part, as well being used as an infusion resin brake.  With a weight of  10oz Breather cloth can be used at pressures up to 200PSI (13.8 Bar) , and also has the benefit of being multi-directionally comformable. This  means that it can be used in even the most complex infusion layups, while still being easy enough for a beginner at infusions to use.  Our breather does not contain any binders that could block off the flow of air or otherwise negatively impact your vacuum infusion. 

What is Vacuum Bagging and Infusion?

Vacuum bagging is a process that uses a two-sided mold that shapes both surfaces of a composite part. The lower mold is rigid, and commonly made from Fiberglass and coated with gelcoat. The upper portion of the mold is made from a flexible membrane or vacuum bag. This vacuum bag can be a reusable silicone material or an extruded polymer film. Once the lay up is completed vacuum is applied to the mould cavity and the material is allowed to debulk. This process can be performed at either ambient or elevated temperature with ambient atmospheric pressure acting upon the vacuum bag.

Once all of the air had been drawn out of the bag through a “nipple” or port  using a vacuum pump; the result is a uniform pressure approaching one atmosphere that is applied to the surfaces of the part inside the bag This pressure hold the part within the bag in place while the matrix is allowed to fully cure. The entire bag may also be placed in a temperature-controlled oven, oil bath or water bath and gently heated to accelerate curing.