PU240 Medium Density Polyurethane (or similiar) as a core for a prepreg construction?


PU240 Medium Density Polyurethane (or similiar) as a core for a prepreg construction?
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AndersES
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AndersES
posted 7 Years Ago HOT
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Hello!

I am making a rather complex model where making a mould is extremely difficult, and not necessary because it is a one time only. 
There fore, I wonder if it is possible to make the the core out of some kind of polyurethane, and proceed to wrap it in pre-preg and then cure it as usual? Does anyone have any experience on this topic? 
Would the polyurethane handle the heat?
Would it bend or deform under vacuum? (The construction is about 40mm wide at thinnest and about 600mm long)

Best Regards, 
Anders
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AndersES
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AndersES
posted 7 Years Ago HOT
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Hanaldo - 3/12/2018 10:52:04 PM
Polyurethanes will inhibit the cure of epoxies at high temperatures unfortunately. 

Thank you for your answer - but the heat in this case would not be higher than 90-100 degrees celsius. Is this still too high?
If it is, do you have any suggestions or recommendations on what I should use instead?
Maybe the EB700 High Temperature Epoxy Tooling Board would work for example?
- A

Edited 6 Years Ago by Warren (Staff)
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PU240 Medium Density Polyurethane (or similiar) as a core for a prepreg construction?
AndersES - 7 Years Ago
     Polyurethanes will inhibit the cure of epoxies at high temperatures unfortunately.
Hanaldo - 7 Years Ago
             Thank you for your answer - but the heat in this case would not be higher than 90-100 degrees celsius. Is this still too high? If it is, do you have any suggestions or recommendations on what I shoul...
AndersES - 7 Years Ago
     PU will inhibit the cure even at relatively low temperatures. By far the better choice would be an Epoxy Tooling block such as our EB700
Warren (Staff) - 7 Years Ago
             Thank you! Is there any cheaper options on the market?
AndersES - 7 Years Ago
     it would help if you can explain a bit more about what you are trying to achieve? Does it need to be prepreg that you are using? Could you make the core from a cheaper foam material and then skin it....
scottracing - 7 Years Ago
     Tooling board would work, but it wouldn't be lightweight at all, especially the EB700 tooling board as it is a 700kg/M3 density - extremely heavy for use in a final component. You ideally want...
Hanaldo - 7 Years Ago
             What about this http://www.rohacell.com/product/rohacell/en
Tony2125 - 7 Years Ago
                 Interesting site, bookmarked :-)
Steve Broad - 7 Years Ago
                     YesI ve looking for foam core solution for a project.I know some guys use EPS polystyrene, but I don’t know if this require a preparation for using it with pregWhat I found wasRohacellSoluble foam...
Tony2125 - 7 Years Ago

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