little OT : drilling pcb's

[Batz Goodfortune]

Y-ellow Y'all.
	The way I understand it, the health risks from fibre glass are mainly due
to the glass. It's also the reason that your drills blunt so easily. But
imagine inhaling particles of finely ground up glass. I think you get the
picture...

Fiber glass is made using an epoxy resin compound with layers of very find
glass rods embedded into it. If you're a fibreglasser, such as a boat
builder, you mix it yourself. In a mould. I don't know the formula for this
but you lay down a coating of 2-pack epoxy, before it sets you get ply
cloth made of glass. This is held together with thin resin. It looks like
an asbestos fire blanket. This is layered into the mould at levels like
ply-wood and the whole thing sets into what we commonly refer to as "fiber
glass".

I don't know exactly how boards are made but looking at it closely I think
they must get their glass as very fine hair-like strips. Probably just as a
big lump like a stack of straw. Then they mix it and roll it. Something
like that I'm guessing.

Anyway the practical upshot is that it's epoxy, which in it self isn't
really good for you when it melts and forms vapors, and glass. Which is
about as abrasive as you can get. Just think about it this way, they make
glass-paper for sanding stuff down with...

All sandwiched together in a ply.

Hope this helps.

Be absolutely Icebox.

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