[sdiy] Chip Tempcos was RE: Solder paste and toaster ovens

[Richard Arntzen]

> > There is a kind of "packing peanut" material for
> > shipping that is a figure-8 shape of styrofoam.
> > 1/2 of this stuff JUST slips over a TO-5 can
> 
> This is full of holes (the peanuts, not the idea).  I'm not 
> sure how effective this would be from isolating the ambient 
> temp fluctuations of it
> breathes like it does.  Small cell, maybe.   Epoxy would be 
> best  - but also
> a complete real drag.

Small holes filled with air are really effective thermal isolators - and if
the holes are small (less than say 0.5mm diameter) the convective
(thermal-induced) air exchange will be next to negligible due to drag.

Or so I was led to believe at school...

Richard