[modeleng] Re: plastic pipe - why not composite?

Hi there Alan,

One more thing you may like to consider: quite frequently where they 
appear to have used a plastic for something that you wouldn't have though 
they could have used it for, they haven't used a plain plastic.

I would image that if you took a plastic that could take high temp but not 
high pressure; and then added something to it to make it into a composite 
then this would increase it's strength so that it could take the pressure, 
for example a glass filled plastic composite.

I've got part of a truck air cussion spring a few feet away from me, that 
will take 5 tonnes of load, and it has a plastic base (with steel inserts 
for the bolting points though). It is a glass plastic composite.

The only problem is that you don't want to alter it's properties so that 
it would shatter if the steam pressure was too great, you'd really want 
it to bulge instead (if you see what I'm getting at).

Possibly someone else on the list could advise about modern plastic 
composites, or you could look up a list on the web.

RS has a good list in it's catalogue (you may be able to get to it online 
rswww.com or I can send you a scan of the catalogue pages if you want).

They have one - PPS 40% glass filled which they say has high thermal 
mechanical strength. max long term service temp 230degC.

Thinking of materials more common to model engineers, Tufnol Carp and 
Tufnol Whale are both capable of taking up to 120degC and have good 
mechanical strength - what temp did you need again?

Yours,


Rich.


On Wed, 26 Apr 2006, alan stepney wrote:

> Thanks for the suggestions and comments guys.
>
> Alan
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