infusion surfboard

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infusion surfboard

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demy182	d demy182 posted 5 Years Ago HOT Topic Details
d Group: Forum Members Posts: 5, Visits: 36	do you think it is possible to build a surfboard with the infusion on both sides and a eps core inside?
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Lester Populaire	L Lester Populaire posted 5 Years Ago HOT Post Details
L Group: Forum Members Posts: 311, Visits: 13K	+x demy182 - 4/19/2019 10:41:13 AM do you think it is possible to build a surfboard with the infusion on both sides and a eps core inside? The eps foams usually used for surfboards are not strong enough to withstand a full vacuum. I'm not saying it's impossible, but certainly complicated and won't give you really an advantage.
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oekmont	oekmont posted 5 Years Ago HOT Post Details
Group: Forum Members Posts: 550, Visits: 27K	Sorry, but vacuum bagging doesn't apply any pressure to a solid material. In principle, the bagging film applies just the same pressure to the foam, that the atmosphere would do without the bagging film. However, in reality the bagging film will warp your foamboard quite heavily, because it wrinkles and stretches as it is evacuated. But yes, it is possible, there are yt videos that show that, but you will likely want to take heavier foam than regular eps.
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Lester Populaire	L Lester Populaire posted 5 Years Ago HOT Post Details
L Group: Forum Members Posts: 311, Visits: 13K	+x oekmont - 4/19/2019 1:48:42 PM Sorry, but vacuum bagging doesn't apply any pressure to a solid material. In principle, the bagging film applies just the same pressure to the foam, that the atmosphere would do without the bagging film. However, in reality the bagging film will warp your foamboard quite heavily, because it wrinkles and stretches as it is evacuated. But yes, it is possible, there are yt videos that show that, but you will likely want to take heavier foam than regular eps. Yes obviously it doesn't on a solid. The problem is though, that the EPS foam has not perfect closed cells, is inhomogeneous and degasses, so it will crush your foam.
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oekmont	oekmont posted 5 Years Ago HOT Post Details
Group: Forum Members Posts: 550, Visits: 27K	I infused samples with cheap eps in the past. But as it's so cheap I bagged a small sample of foam yesterday. 7mm strong. Sunk in 1/10th mm right away as I applied vacuum and then stayed there for ever. last check was a few hours ago. I agree to the point, that the 1/10 is caused by the crushing of the open surface porosity. But in the end it's a closed cell foam and therefore cannot crush under vacuum. But I would absolutely not recommend eps for mouldless processes because it's a bad material to get in precise shapes.
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Lester Populaire	L Lester Populaire posted 5 Years Ago HOT Post Details
L Group: Forum Members Posts: 311, Visits: 13K	+x oekmont - 4/20/2019 8:53:40 PM I infused samples with cheap eps in the past. But as it's so cheap I bagged a small sample of foam yesterday. 7mm strong. Sunk in 1/10th mm right away as I applied vacuum and then stayed there for ever. last check was a few hours ago. I agree to the point, that the 1/10 is caused by the crushing of the open surface porosity. But in the end it's a closed cell foam and therefore cannot crush under vacuum. But I would absolutely not recommend eps for mouldless processes because it's a bad material to get in precise shapes. you got me curious there and i just ran the same test as well and the foam was completely fine. I was sure i tested that once years ago and crumbled the foam, but i do not know what i did back then... Anyway, sorry for my false statement before. I think with a skim coat of resin/microballons and some sort of jig to avoid warping of the blank you should be good!
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Fasta	Fasta posted 5 Years Ago Post Details
Group: Forum Members Posts: 468, Visits: 3.5K	+x Lester Populaire - 4/23/2019 8:04:13 AM +x oekmont - 4/20/2019 8:53:40 PM I infused samples with cheap eps in the past. But as it's so cheap I bagged a small sample of foam yesterday. 7mm strong. Sunk in 1/10th mm right away as I applied vacuum and then stayed there for ever. last check was a few hours ago. I agree to the point, that the 1/10 is caused by the crushing of the open surface porosity. But in the end it's a closed cell foam and therefore cannot crush under vacuum. But I would absolutely not recommend eps for mouldless processes because it's a bad material to get in precise shapes. you got me curious there and i just ran the same test as well and the foam was completely fine. I was sure i tested that once years ago and crumbled the foam, but i do not know what i did back then... Anyway, sorry for my false statement before. I think with a skim coat of resin/microballons and some sort of jig to avoid warping of the blank you should be good! I crushed a windsurf board many years ago. It seemed fine at first but then I left it for some hours and when I came back the whole deck had collapsed. I think maybe if you had a harder foam and/or also used a little less vacuum pressure? You need to make some experiments and see for yourself. Fastacraft Facebook page Edited 5 Years Ago by Fasta
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Lester Populaire	L Lester Populaire posted 5 Years Ago HOT Post Details
L Group: Forum Members Posts: 311, Visits: 13K	+x Fasta - 4/23/2019 8:16:06 AM +x Lester Populaire - 4/23/2019 8:04:13 AM +x oekmont - 4/20/2019 8:53:40 PM I infused samples with cheap eps in the past. But as it's so cheap I bagged a small sample of foam yesterday. 7mm strong. Sunk in 1/10th mm right away as I applied vacuum and then stayed there for ever. last check was a few hours ago. I agree to the point, that the 1/10 is caused by the crushing of the open surface porosity. But in the end it's a closed cell foam and therefore cannot crush under vacuum. But I would absolutely not recommend eps for mouldless processes because it's a bad material to get in precise shapes. you got me curious there and i just ran the same test as well and the foam was completely fine. I was sure i tested that once years ago and crumbled the foam, but i do not know what i did back then... Anyway, sorry for my false statement before. I think with a skim coat of resin/microballons and some sort of jig to avoid warping of the blank you should be good! I crushed a windsurf board many years ago. It seemed fine at first but then I left it for some hours and when I came back the whole deck had collapsed. I think maybe if you had a harder foam and/or also used a little less vacuum pressure? You need to make some experiments and see for yourself. let the pump run after that statement and now after a couple of hours the core is quite a bit crumbled. certainly not usable for anything really. So i revise my opinion again and stand by what i said first
	Reply Like 2
oekmont	oekmont posted 5 Years Ago HOT Post Details
Group: Forum Members Posts: 550, Visits: 27K	My foam is still exactly as before. Pressure is still at 8 mbar. Seems like not every foam, maybe even most foams can take it. Hardness is not a criteria, the foam I used is a wobbly as eps foam can get. I could quite easily crush it with my fingers. Edited 5 Years Ago by oekmont
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