Xencast Flexible Polyurethane Rubber


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TURK
TURK
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Hi all,



I've got a few questions regarding the 'new' product 'XenCast Flexible Polyurethane Rubber' advertised on your website.

Basically I'm making a couple of moulds with the intention of casting 'Vac-Cast Epoxy Resin' into them,  what I need to end up with are two perfectly reproduced tooling plugs for vacuum forming my final parts into ABS plastic.



The following image will hopefully explain in greater detail my procedure.  I've recently used a product from 'Smooth-On' called 'OOMOO 30',  but had a disastrous result.  I must admit,  as good as it seems to be I just hate working with it.  Here's what my original mould box looks like with my plug secured in the base,  I then poured the silicon rubber into the mould box .........  it was an awful lot of work,  trying to mix what was a consistency of partly molten lava,  and the impossibility of pouring made the job needlessly difficult,  the result was a failed pour and a very badly formed mould  !  >>

 



Pouring the mix in a thin stream in a low corner was just impossible,  I almost had to resort to 'trowelling' it in ! >>

 



When I demoulded the following day,  it wasn't too bad,  but strictly speaking an appalling result.  Not something I would want to cast resin into that's for sure .........  I put it down to a good learning experience  >>





Because the silicon rubber wasn't 'fluid' enough,  full coverage of my plug wasn't achieved,  leaving large voids and air pockets  >>

 









So basically,  my question is,  would that 'XenCast flexible Polyurethane rubber'  be an alternative to OOMOO 30  ?

I've been looking at the 'XenCast PX30',  it seems to have the same characteristics as the OOMOO 30  ( both Shore A of 30 ),  how will it react to Vac-Cast Epoxy Resin being poured into it  ?







To further explain my situation my entire procedure is here >  Headlight mounting bracket moulds
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Hanaldo
Hanaldo
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I'm sure the paste will work in exactly the same way if it isn't still the same product. I love tooling putty, it makes a lot of jobs so much simpler. A couple of things to watch out for - it traps voids very very easily, which can then lead to blisters on the gelcoat. I would recommend watching EC's updated video on how to make a high temperature mould using tooling putty. This video demonstrates a different technique in applying the putty where you do little pieces at a time rather than the whole lot in one go, which is very important in reducing trapped voids.

Secondly, be wary of potentially thin sections going over any male radius. If you're less than 10mm thick, the stuff can be quite brittle and you may snap it when demoulding. Male radius tend to be the areas where you go thinner, so just watch that.


Glad to see any update, I did enjoy following this thread. Vacuum forming interests me alot, so I'll be following along again! 
GO

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