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> I claim no deep insight into plastics but some of them do not
> take the temperature extremes lightly and some of them do crack
> if hit with a sharp object.  AL takes both of these abuse modes
> in stride.
> 
> John

One message said they are made out of Delrin. This is a very tough plastic. You
can drill it and thread it like metal and use metal bolts with it. It is very 
stable at high temperatures, is impervious to most chemicals, and ages well.

You can also carve it like wood with bladed metal tools.

I've seen it used in pharmaceutical machines that are sterilized with 
pressurized steam and left soaking in sodium hydroxide when not in use.

This isn't an advert for DuPont, just a description of this material.

Rick

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