Vacuum Perfusion Process

Vacuum perfusion molding is mostly used in the field of composite materials, it (or “resin perfusion”) is a process of combining fibers and resins, which uses atmospheric pressure to drive the resin to strengthen the stacking of materials by drying in vacuum. The material is laid flat on the mold, and the resin is introduced after pumping the vacuum. In order to achieve a complete vacuum, the resin permeates into the layer layer by layer through the pipe.


1. Higher resin fibrosis

The excess resin is exported through the vacuum tube to ensure the least introduction of resin, reduce weight, improve strength, and maximize resin and fiber savings. The parts made by vacuum perfusion molding can reach a very flat level.

2. Reduce waste of resin

Through vacuum perfusion molding, the amount of resin can be calculated. Therefore, the waste of resin can be reduced and the utilization can be maximized.

3. Consistency of resin dosage

4. Reduce preparation time

There is no time limit for vacuum perfusion. During vacuum, the reinforcement layer is still dry until all the resins are completed.

5. Clean

The process is clean and does not require brushes or bundles, nor does it need to be sprayed or sprayed. It is a relatively clean and safe process, but it is recommended to operate in a ventilated environment.


1. Complex vacuum system

It is complicated to set up a vacuum system, but the requirement for time is free. The vacuum tube is required not only to be able to introduce resin, but also to expand in the bag. The arrangement of the vacuum is different from the introduction of resin into each part, and the setting method is also different.

2. Easily damaged parts

When there is a vacuum leak, even a little bit of air enters, it will lead to the scrapping of the whole product, and may also lead to the accumulation of layers of resin, some of which are not completely soaked or the resin is blocked.

3. Trial and error

For the complexity of this process and the treatment of problems, there will be a set of experiments and problem correction process. Constantly summarize the mistakes in the experiment and find a solution. At the time of production, there is usually a 6-month test and preparation period.

Generally speaking, vacuum perfusion is an ideal way to build composite components. Compared with open mold or vacuum bagged wet lamination, it is cleaner and more consistent. After decades of steady development, vacuum perfusion is a mature technology with perfect technology, supporting products and equipment.

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