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Finnluxury
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+x+x+xSilicone vacuum bags work fine with carbon infusion, you just need to use flow mesh and factor that thickness in when making the bag. This is as simple as just infusing your first parts in the regular fashion with conventional vacuum film, then making the silicone bag prior to demoulding or removing the consumables. In the videos they are likely using CSM that has flow media incorporated into it, which is quite common. For your sealing method, I actually recommend combining both the channel in the mould, AND then channel in the bag. I've never had success using one or the other, but a combination does work well. Just make sure not to use too much reinforcement when you make the channel in the bag, as if it is too stiff then the channel won't draw down and seal against the mould surface. Also yes, silicone bagging is SIGNIFICANTLY quicker once you've worked it out. It is literally a case of throwing the bag on, getting the sealing channel in place and pulling vac. It's a 1 minute process, every single time. The bag seals itself consistently so theres no need to leak check, bridging is never a concern... It is definitely a great way to save time on production runs. But it does take a bit of time and effort to get it working nicely. Hi! Do U have the channel in the mould at inner or outer side of the mould flange? I were thinking that I could have mould channel at inner side of flange, and then the bag channel at outer side of the flange. Have u tested is there difference which one is outer and which one in inner side? Would u have any photos to share?  I keep the mould channel on the outside of the mould, reason being that it works as more of a locator than a seal. Ill try to find some photos for you I would be really happy to see some photos. I just received the spray gun and other materials today. Can't wait to get test these materials.
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Finnluxury
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Group: Forum Members
Posts: 50,
Visits: 448
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+x+x+xSilicone vacuum bags work fine with carbon infusion, you just need to use flow mesh and factor that thickness in when making the bag. This is as simple as just infusing your first parts in the regular fashion with conventional vacuum film, then making the silicone bag prior to demoulding or removing the consumables. In the videos they are likely using CSM that has flow media incorporated into it, which is quite common. For your sealing method, I actually recommend combining both the channel in the mould, AND then channel in the bag. I've never had success using one or the other, but a combination does work well. Just make sure not to use too much reinforcement when you make the channel in the bag, as if it is too stiff then the channel won't draw down and seal against the mould surface. Also yes, silicone bagging is SIGNIFICANTLY quicker once you've worked it out. It is literally a case of throwing the bag on, getting the sealing channel in place and pulling vac. It's a 1 minute process, every single time. The bag seals itself consistently so theres no need to leak check, bridging is never a concern... It is definitely a great way to save time on production runs. But it does take a bit of time and effort to get it working nicely. Hi! Do U have the channel in the mould at inner or outer side of the mould flange? I were thinking that I could have mould channel at inner side of flange, and then the bag channel at outer side of the flange. Have u tested is there difference which one is outer and which one in inner side? Would u have any photos to share? I keep the mould channel on the outside of the mould, reason being that it works as more of a locator than a seal. Ill try to find some photos for you Did u happend to find any photos?
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Hanaldo
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Group: Forum Members
Posts: 2.5K,
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+x+x+x+xSilicone vacuum bags work fine with carbon infusion, you just need to use flow mesh and factor that thickness in when making the bag. This is as simple as just infusing your first parts in the regular fashion with conventional vacuum film, then making the silicone bag prior to demoulding or removing the consumables. In the videos they are likely using CSM that has flow media incorporated into it, which is quite common. For your sealing method, I actually recommend combining both the channel in the mould, AND then channel in the bag. I've never had success using one or the other, but a combination does work well. Just make sure not to use too much reinforcement when you make the channel in the bag, as if it is too stiff then the channel won't draw down and seal against the mould surface. Also yes, silicone bagging is SIGNIFICANTLY quicker once you've worked it out. It is literally a case of throwing the bag on, getting the sealing channel in place and pulling vac. It's a 1 minute process, every single time. The bag seals itself consistently so theres no need to leak check, bridging is never a concern... It is definitely a great way to save time on production runs. But it does take a bit of time and effort to get it working nicely. Hi! Do U have the channel in the mould at inner or outer side of the mould flange? I were thinking that I could have mould channel at inner side of flange, and then the bag channel at outer side of the flange. Have u tested is there difference which one is outer and which one in inner side? Would u have any photos to share? I keep the mould channel on the outside of the mould, reason being that it works as more of a locator than a seal. Ill try to find some photos for you Did u happend to find any photos? I unfortunately haven't got any mate, but I'll try to take some for you by this weekend.
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Finnluxury
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Group: Forum Members
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I had first test of the vacuum bags today. Using the spray gun was really easy and fast. Only negative thing is that the EZ-Spay 20 silicone is way too easy to run from the deep walls. So it has too much viscosity. Good thing is that the bag is cured after 20 minutes and can be used after that. I made the bag in two parts, I let the first few layers to fully cure and then I add extra layers over that. This way I got thickness on vertical walls too.
The first bag itself didn't hold the vacuum. I used only one channel in the vacuum bag and no channels on the flange itself. I have vacuum port on mould flange, and the bag vacuum channel is placed over the vacuum port. Its super fast to get the bag in vacuum. I just throw it over the mould and start the pump, and it immediatly suck all the air out. Just a minor leaking on the flange area. I saw that the vacuum bag edges jump up after the vacuum is applied to the channel, and the channel is sucked to mould flange. So I may do the next bag with a channel on the flange, and channel on the bag. I may even make the flange channel to have a vacuum also.(most likely it wont need it).
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Finnluxury
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Here is few photos of mould, where we started to make silicone membrane vacuum bag. The wax sheet strips works like a vacuum channel, and outer white colored silicon will be the main vacuum channel that keeps the vacuum.  
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Finnluxury
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Group: Forum Members
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Our last bag worked very well. We accelerated the resin with Cobalt and got 30min cure times. I will try DMA with cobalt next time, if we could get even faster cycle time. Probably I try 1% of Cobalt + 0,2% DMA + 2% AAP. (do not ever mix them together, mix them one by one to resin or they will cause huge explosion)
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Hanaldo
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Group: Forum Members
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Nailed the vac bag mate, that's virtually exactly the setup I do to make mine. I also have the channel in the mould, but on the mould you've got there it wouldn't be easy to put a channel in. It looks like you've got plenty of flange for the bag to seal to anyway.
How fun is promoting resin 😧... If you ever travel, be aware that cobalt is what they look for when they swab for explosives. I've been pulled into a cozy little room a couple of times and questioned, so I must have some residue on my clothes or hands or somewhere, which is interesting given how careful I am with the stuff.
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