Well, it's nice to see your sense of humor is branching out and is no
longer amorphous.
Dewey
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Friday, September 08, 2006 1:49 AM
To: [log in to unmask]
Subject: Re: [LF] Immersion Silver and tarnish
That is hevea going (forestalled Dewey there!)
Brian
Nic Bowker wrote:
> Yep, it appears that when it was first discovered, the founders had
high hopes for rubber.
>
> High apple pie in the sky hopes.
>
> However, during the discoveries, as with all prototyping, it didn't
always goes well and they were often heard to say "Oops there's goes
another rubber tree plant".
>
> Nic Bowker
> Technical Resources Adviser
> PLASA Ltd.
> 38 St Leonards Road, Eastbourne, East Sussex, BN21 3UT, UK.
> Tel: +44 (0)1323 410335 : Fax: +44 (0)1323 646905
> Email: [log in to unmask] : Website: www.plasa.org
>
> Join one of the largest trade communities in the industry.
> www.plasa.org
>
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]]On Behalf Of Brian Ellis
> Sent: 08 September 2006 09:26
> To: [log in to unmask]
> Subject: Re: [LF] Immersion Silver and tarnish
>
>
> I don't know about today, but liquid latex is "caked" by smoking and
> then hardened by vulcanising with, er, sulfur. Are you sure you really
> want natural rubber anywhere near your assemblies? Of course, some
> erasers (or rubbers as they are called on the civilised side of the
> Atlantic) may be made from synthetics which could contain all sorts of
> nasties. However, they all contain abrasives, so rubbing a solder pad
is
> an almost perfect recipe for dewetting.
>
> As it is Friday here, to satisfy Dewey, the etymology of 'rubber' is
> because it was used to rub out pencil marks. Its use for other
> frictional activities in N. America came much later.
>
> Brian
>
> Genny Gibbard wrote:
>> Are cardboard ESD boxes a source of sulfur that could tarnish
Immersion
>> Silver PCBs?
>> If you have tarnish on a PCB, would you ever try to remove it with an
>> eraser?
>>
>> Just wondering...
>>
>> Genny
>>
>>
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