Problem with eps is that it's generally much lighter and most importantly it is not closed cell. There is air between the cells and it get sucked out, collapsing the foam. A way around it is to laminate a thin layer of glass on first by hand. That seals it up.geir wrote: ↑Mon Nov 25, 2019 9:17 pmIn the process of gathering supplies and planning for a proper carbon build. Done one vaccum process board which turned out so so - good learning experience. Two questions for you experienced vaccum process builders out there:
1. Whats the general concensus about pump pressure using closed cell pvc type core (65-70) (Guess higher than the crap eps polystyrene I used, which buckled over 6 psi on a test I did beforehand)
2. Are you using perforated film aswell as peelply or just peelply?
Thanks, Geir
Yep, learned that the hard way. Got the pressure right at the end - was a veneer composite EPS sandwich, closed rails with carbon/fiberglass tape. Newbie mistake to take it out riding with pinholes. Got that sorted but then got leaks on the insertsTomW wrote: ↑Mon Dec 16, 2019 12:38 pmProblem with eps is that it's generally much lighter and most importantly it is not closed cell. There is air between the cells and it get sucked out, collapsing the foam. A way around it is to laminate a thin layer of glass on first by hand. That seals it up.geir wrote: ↑Mon Nov 25, 2019 9:17 pmIn the process of gathering supplies and planning for a proper carbon build. Done one vaccum process board which turned out so so - good learning experience. Two questions for you experienced vaccum process builders out there:
1. Whats the general concensus about pump pressure using closed cell pvc type core (65-70) (Guess higher than the crap eps polystyrene I used, which buckled over 6 psi on a test I did beforehand)
2. Are you using perforated film aswell as peelply or just peelply?
Thanks, Geir
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