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Moulding Plastic

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Brian Reay - 26 Jan 2006 22:18 GMT
I'm looking for a plastic material in sheet form that I can mould to a
(roughly) U shape but with a squared off part in the U curve in the middle.

Basically, the idea is to mould the material around a roof rail of a car to
seal around a small box ( say 100mm x 25 mm * 25 mm) that is in a gap in the
rail.

After mouldng, material needs to be sun and water proof. and keep the
moulded shape once formed.

Can anyone suggest a material and method?

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73
Brian, G8OSN
www.g8osn.org.uk

Kevin Steele - 26 Jan 2006 23:21 GMT
Plastics generally aren't very good in sunlight, most are adversely
affected by UV.  It would be worth a look at some of the extrusions at
your local DIY/building store (guttering, etc.).  As these are
designed to be in sunlight they will have the necessary UV stabilisers
added to them -and there is a reasonable chance you will find
something that can be made to suit your application -and for odd
lengths it should be quite cheap.

As for forming, most thermoplastic materials can be heat bent.  As the
name suggests this process consists of heating the plastic until it
becomes, er, plastic (unfortunate term in this case) and bending it
over a former (such as a roof bar).  A little experimentation with a
heat gun should produce satisfactory results.

Or, if all else fails, about 18" of gaffa tape should do the trick <G>

Regards
Kevin

>I'm looking for a plastic material in sheet form that I can mould to a
>(roughly) U shape but with a squared off part in the U curve in the middle.
[quoted text clipped - 7 lines]
>
>Can anyone suggest a material and method?
Colin Wildgust - 27 Jan 2006 08:55 GMT
hello Brian if its any use I have just unpacked some new central heating
radiators and protecting them are 4 capped end trays 115mm x 30mm x 15mm x
2mm section in grey 2 of these glued together would make the size you are
after there are 8 in total making 4 sealed boxes if they are any use please
email me your address and I will post them off to you, email  
colin.wildgust@virgin.net
Andrew Bishop - 30 Jan 2006 22:53 GMT
ABS easy to form  with heat and formers used by most motor manufactures on
vehicle body's
Andrew
> I'm looking for a plastic material in sheet form that I can mould to a
> (roughly) U shape but with a squared off part in the U curve in the
[quoted text clipped - 8 lines]
>
> Can anyone suggest a material and method?
 
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