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Plastic Casting

Community Veteran
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Registered: 06-11-2007

Plastic Casting

Has anyone any experience, or advice, regarding plastic casting ?
I need to make a couple of small items to replace broken/missing pieces.... I have got a "similar" item I can make a mould from, but have no idea how to go from there...
I found this item on ebay.....  
http://www.ebay.co.uk/itm/Black-Fast-Cast-Polyurethane-Liquid-Plastic-Casting-Resin-250g-230ml-litre...
the items I want to make should be "hard plastic"... with little or no "give"  in them.... they are about 1.5" or 40 mm long.... by about 1/4" wide and 1/4" deep... they are screwed down ( at each end )  to form a bracket, or cover  which will be under slight pressure... hence the "no give" requirement...
the items shown with the above ebay item, look as though they  would be "soft" plastic, and if that is the case, then that particular item would be no use.....
Price wise,... not looking for anything that will cost more than a tenner .
any help or advice/suggestion of product  etc.. much appreciated.

12 REPLIES
Community Veteran
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Registered: 15-06-2007

Re: Plastic Casting

I suggest an epoxy casting system
Community Veteran
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Re: Plastic Casting

The only thing I can find with that, is "Epoxy Resin" type stuff, used for joints etc... as in  Araldite type applications.....
Community Veteran
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Re: Plastic Casting

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Re: Plastic Casting

how 'bout: http://www.ebay.co.uk/itm/SQUARE-CLEAR-ACRYLIC-ROD-SOLID-PERSPEX-BAR-PLEXIGLASS-ROD-3MM-to-40MM-SECT...
Call me 'w23'
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Community Veteran
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Re: Plastic Casting

If it isn't going to get hot, look at Polymorph.
Pop it into very hot water and it goes like hot melt glue. When it cools it is almost as tough as nylon. Heat it up again and it goes back to its soft state.
Great stuff for prototyping and generally messing about.
Community Veteran
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Re: Plastic Casting

Just make sure it's not the emotion-stealing kind of Polymorph... Grin
Community Veteran
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Re: Plastic Casting

@ OldJim..... thanks for the linky... will have to do some more research on that product...
@ W23.... yes I saw that,... but may have a problem trying to "gouge out" a small square open on two faces of the square rod... still thinking about it, though...
Wink
Community Veteran
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Re: Plastic Casting

Dremel?
Call me 'w23'
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Re: Plastic Casting

I would suggest the perfect solution would be a 3D printer - but a tad expensive a quite a leaning curve!
jelv (a.k.a Spoon Whittler)
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Community Veteran
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Re: Plastic Casting

May also be worth searching 'potting compound' or 'encapsulating resin'.
Call me 'w23'
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
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Re: Plastic Casting

You can get silicon rubber mould and plastic casting kits, but they start around 40 quid.
Now Zen, but a +Net residue.
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Re: Plastic Casting

O.K.  Thanks guys..... as usual... a load of info and suggestions... so will see what I can glean from various adverts etc on line and on ebay....
Wink