baja_patient
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Group: Forum Members
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I love this product, hands down. As said, I have made some decent parts with the normal method, and further perfection is likely to result in pinhole free parts. Yet I have used the MTI hose on the last couple of parts and it works as described. Sure, it is expensive, but it saves a lot of time, and makes things much easier. The last part i made came out beautifully, no single pinhole on the whole part, no in-mould coating. Very high fiber to resin ratio, the part sounds very "ceramic" when tapped with something metal. Either way I would suggest easy composites become a dealer for this in the UK, because as your name states, your products should make composites easier, and this certainly does. Even high-end professionals and consultants in the industry endorse this stuff. cheers
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Zero Mass Motorsports
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carbonfibreworks (12/08/2013)
I have purchased and used the MTI hose and had very good results but have also had the same using the normal practice using spiral and and catch pot etc. I do like how it works and it is an excellent product and easy to use (compared to the standard practice) but the major downside for me is the cost @ 27.80 Euros for 5 metres compared to £3.50 for 10 metres of spiral. Chris Alty www.carbonfibrewoks.co.uk Surely with some minimum volume that per metre cost will go down? Everything goes like this it seems. Dont forget, a few large bonus' from what I read is optional catch pot, no time covering tubing with peel ply and no resin starvation once infused-(vacuum stays full on). Maybe not such a big deal when working alone, but anything to help cross-training added employess is huge. The less they have to concentrate on the better. Has anyone tested it with no IMC -( in mould coating) and recieved zero pinholes ?
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carbonfibreworks
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Group: Forum Members
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I have purchased and used the MTI hose and had very good results but have also had the same using the normal practice using spiral and and catch pot etc. I do like how it works and it is an excellent product and easy to use (compared to the standard practice) but the major downside for me is the cost @ 27.80 Euros for 5 metres compared to £3.50 for 10 metres of spiral. Chris Alty www.carbonfibrewoks.co.uk
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DD-Compound
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I know that most people do not believe in new things, and even the experienced laminators are very sceptic when they should try new things. Never change a running system, I am also a fan of this princip. But most people which will tell you they never have problems with pinholes, dry areas, voids, resin waste..... will have these problems sometimes more or less. We have a lot of customers who infuse all their parts with MTI now, and they infuse since years and a lot of parts. For them most times the process stability and the reproducibility of the quality is the most important thing. For the DIYs how you called them it is most times the chance to get a perfect part with much less experience in infusion. Of course can you produce good parts by infusion without MTI hose, but it is much easier with MTI hose. Also the physical pros of the hose are there and you can not deny them. The MTI hose is no miracle cure, but it will help you a lot. If you do not have the correct parameters you will not get even a good part with MTI, but if everything is correct you will get a very nice part.
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Warren (Staff)
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Group: Administrators
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That depends.....
For an experienced laminator, alot of the issues the MTI claims to solve, will very rarely be a problem....
for the less experienced or DIY'er, I can see why it might appeal.
Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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Shaneer22
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This product will save you time and money,may be easy composite can be a distributer.
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DD-Compound
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Group: Forum Members
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Hello, the MTI hose is our product. I like the discussion here, that shows me people think about things and do not just believe in what is told them. The thing with the oversaturation can be correct if you let your resin feed line open. But you will get really fast a feeling for that. You can also place your resin feed about 1-1.5 meter below your part. This height difference will create a presure difference that will prevent a oversaturation. We have a study here wherethey produced pinhole and void free part by MTI hose with a VF between 62 and 67% The reason why we did not make a hose with slightly bigger poores is that than the physical advantage of the hose will be gone. Now you have a closed system after infusion where no vacuum is working, but the full ambient pressure will compact the laminate. If the poores will be a little bigger, the vacuum can still pull resin out and so air inside the part can cause micro voids, pinholes or other mistakes. I added the video of how it works, I hope it helps to understand the advantages. Dominik
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Designbikes
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Group: Forum Members
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Here are some interesting videos about MTI, its benefits and proper use: http://www.youtube.com/user/GAComposites
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fgayford
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Group: Forum Members
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Warren (26/07/2012) surely as soon as the resin reaches the hose, the pores will block and any trapped air will stay in the laminate?? ie resin flow will stop as will vacuum pull.
Surely this will lead to resin rich parts??
As we all know, during infusion, the vacuum on the resin feed side of the mould plummets as its only the viscosity of the resin stopping the vacuum going completely back to ambient pressure.
So you are going to have to be very careful in timing when you clamp off the resin feed to ensure there is enough vacuum head on the resin to pull a vacuum again by the resin feed and even out the laminate before it gets to the hose all the way round.
Sure it might give pin hole free parts and might be useful if the resin isnt flowing right to edges far from vacuum port, but surely it does nothing that cant be achieved with proper planning and placement of resin feed, spiral, mesh and vacuum ports. I don't agree. If you look at that membrane and compare it to the behaviour of a paint filter for example. You can pour water through it easily. (think of the water as the Vacuum) Now pour in a hand full of wet sand.(representing the resin ) You can still pour water through the filter no problem as it will flow through and around the sand) just as the air will. Fred
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sebgron
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Group: Forum Members
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Hey! Depends really on the mold, on some I place it all the way around on others just at the vacuum end. As soon as it reaches the MTI hose the resin flow will stop, that's when I clamp of the line and turn off the vacuum. This might also help you: http://www.compositescentral.com/showthread.php?t=6530Good Luck!
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