Re: this cap made for trouble?

To: tesla-at-pupman-dot-com
Subject: Re: this cap made for trouble?
From: "ROBERT CRESSLER" <59CREROB-at-menasha-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Mon, 20 Dec 1999 16:42:41 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

        bob,
               your response to Jan. "Careful with those transparency
sheets, They might be polystyrene or Mylar" an said sheet is on the mark.
It's probably mylar,but others are possible
(cab,pvc,pc,alloys,ect). generally the cheapest mat'l possible.
manufacturing methods are also
shaky from cap building standard..... voids,pin holes,and like........  (no
problem for something designed  to cover a sheet of paper!) Polyethylene ,
Polypropylene are the way to go.
FYI.......the old burn test:(be very carefull when smelling,some plastics
emit noxious/toxic flumes!!!!!!!!!!)
Mylar/polyester       material will smell like HCL,flame is yellow,/yellow
blue edges,no drip

cab/acetate             vinegar smell,yellow/yellow with sparks,may or
maynot drip

pvc/flexible      smells of HCL,yellow with ghreen edges for flame , no drip

polystyrene--(long shot)   smells like natual gas(sort of) fast
burning,drips,yellow flame,lots of thick black sooty smoke

            Steve,
                      the wild world of FRP is considered to be outside the
"plastics" industry as I know it,(as are elastomers)..... but here is my 2
cents.......
G-10 is a high pressure laminate made of glass cloth (fabric) with a epoxy
resin. heat/high pressure are used to cure the material.... FRP is (I
think) layer(s) of glass with a polyester
(???) base resin,cured by chemical catalyst...no or low pressure.they are
similar but...
research is in order......

Robert