What Vacuum Required?


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dilligaf76
dilligaf76
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Hi, can anyone tell me what the required Vacuum pressure is required for wet laying Carbon Fibre?
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dilligaf76
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Steve Broad - 6/2/2020 9:56:38 AM
dilligaf76 - 6/2/2020 9:31:08 AM
Hi, can anyone tell me what the required Vacuum pressure is required for wet laying Carbon Fibre?

As much as you can manage, IMO. The better the vacuum the better the compaction and carbon/resin ratio. Extreme vacuums are not essential when wet laying, again IMO, but if your vacuum pump can manage 99.95% that will be good.

I've heard that could draw out to much resin and be too dry and cause pin holes etc...

Steve Broad
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dilligaf76 - 6/2/2020 1:07:59 PM
Steve Broad - 6/2/2020 9:56:38 AM
dilligaf76 - 6/2/2020 9:31:08 AM
Hi, can anyone tell me what the required Vacuum pressure is required for wet laying Carbon Fibre?

As much as you can manage, IMO. The better the vacuum the better the compaction and carbon/resin ratio. Extreme vacuums are not essential when wet laying, again IMO, but if your vacuum pump can manage 99.95% that will be good.

I've heard that could draw out to much resin and be too dry and cause pin holes etc...
I used peel ply, perforated release film, two layers of breather cloth and the full vacuum capabilities of the EC pump (99.97%) and had no problems. By weight my carbon to resin ratio was between 100:45 and 100:50 with no visible dry patches, pin hoes or delamination.  Image shows car floor under vacuum, showing the resin seeping into the breather cloth having been sucked through the peel ply and release film,



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