What Vacuum Required?

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What Vacuum Required?

What Vacuum Required?

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dilligaf76	dilligaf76 posted 5 Years Ago HOT Topic Details
Group: Forum Members Posts: 49, Visits: 115	Hi, can anyone tell me what the required Vacuum pressure is required for wet laying Carbon Fibre?
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What Vacuum Required?

dilligaf76 - 5 Years Ago

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 manag...

Steve Broad - 5 Years Ago

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

dilligaf76 - 5 Years Ago

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...

Steve Broad - 5 Years Ago

I don't totally agree with Steve on the vacuum level - especially if you are doing thin-skinned parts or trying to do core in one shot. Its one of those things where there are lots of variables and.....

explorecomposites - 5 Years Ago

Thank you Chris you seem to know what you're talking about and have educated me a little more than to what I already know, a massive help and appreciate all the comments on here from everyone...

dilligaf76 - 5 Years Ago

As I mentioned twice, IMO :-) I can only comment on my experience and Chris is quite right that this is a movable feast :-) The only way to find out is to experiment with the method and materials you...

Steve Broad - 5 Years Ago

Vacuum bagging is a technique employed to create mechanical pressure on a laminate during its cure cycle. Pressurizing a composite lamination serves several functions. First, it removes trapped air.....

taimur - 5 Years Ago

Theoretically this is 100% true. In most practical hobbyist applications vacuum is applied to keep the carbon cloth in the edges of the mould during cure and that's it. If if you apply 50% vacuum...

oekmont - 5 Years Ago

Then why do EC proclaim that their EC.4 pump reaches 99.98% vacuum and autoclaves add even more pressure, if this isn't that important?

Steve Broad - 5 Years Ago

When you do infusion, full vacuum is important. Otherwise there would be trapped air in every corner, because the resin would overflow the corner, leaving behind a cavity of 50% pressurised air....

oekmont - 5 Years Ago

Right, for infusion and prepreg the better the vacuum the better. For wet layup, not so important. Got it.

Steve Broad - 5 Years Ago

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