25 Jul
2012
25 Jul
'12
1:06 a.m.
On Tue, 24 Jul 2012, Chuck Guzis wrote:
On 25 Jul 2012 at 1:36, William Donzelli wrote:
It isn't 100% ESD safe because it isn't shielded. This is why many
electronic component distributors will still put parts that are in foam
inside an anti-static bag.
A word of caution with black ESD foam... In the late 1990s I obtained a
bunch of 1960s logic chips stuck in black foam that had begun to break
down and it attacked (and literally corroded away) the IC leads. For this
very reason I prefer to store ICs in tubes vs conductive foam for long
term storage.
Being *too* conductive is not ESD safe. The idea
is to let the charge
drain away slowly. If a charge drains too quickly, it can induce a
charge nearby that might not be protected, like something internal to
a component.
So that black (carbon-impregnated) foam used for ICs isn't ESD-safe
becasue the resistance is only a hundred ohms or so per square inch?