So, a lot of pee for a little P, huh?
Sorry, I could not resist that one.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Ball
Sent: Thursday, June 09, 2005 2:59 PM
To: [log in to unmask]
Subject: Re: [TN] Fire Retardant
An alchemist in the 17th century discovered it by boiling down urine. I
guess you could get some for free that way, but I think it takes a lot
of urine for a little phosphorus. (little sideways smileyface)
I'm betting the spontaneous combustion aspect was a real surprise...
Franklin D Asbell
<[log in to unmask] To:
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OM> cc:
Sent by: TechNet Subject: Re:
[TN] Fire Retardant
<[log in to unmask]>
06/09/2005 03:40 PM
Please respond to fasbell
Now where can I purchase some of that? (grin)
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Ball
Sent: Thursday, June 09, 2005 11:56 AM
To: [log in to unmask]
Subject: Re: [TN] Fire Retardant
Pure phosphorus ignites spontaneously in air and burns to phosphorus
pentoxide.
-Chris
Franklin D Asbell
<[log in to unmask] To:
[log in to unmask]
OM> cc:
Sent by: TechNet Subject: Re:
[TN] Fire Retardant
<[log in to unmask]>
06/09/2005 11:24 AM
Please respond to fasbell
Matches contain more than phosphorus...things like sulfur, potassium
chloride, some use paraffin...etc etc etc... I'm not sure phosphorus
would burn on its own unless it became very very hot...like putting the
tip of a cigarette into a mound of the stuff...
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon
Sent: Thursday, June 09, 2005 9:36 AM
To: [log in to unmask]
Subject: Re: [TN] Fire Retardant
***The so-called halogen free PCB materials
(or at least the ones I've looked into for interest) use
phosphorus as the
retardant.***
Boards have the material that is used in matches to keep
them from burning? Interesting, It must be a special from
of
phosphorous.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Fox, Ian
Sent: Thursday, June 09, 2005 9:23 AM
To: [log in to unmask]
Subject: Re: [TN] Fire Retardant
Ken, Bev is correct, TBBPA which is the usual brominated retardant in
FR4 (anybody heard of anything else being used?) is not currently
targeted by the RoHS legislation. There were rumblings coming from
Scandinavia 12 months or so ago about including TBBPA in the list of
materials not to be used for products carrying the Nordic environmental
swan mark, but as far as I'm aware it never went any further. The
so-called halogen free PCB materials (or at least the ones I've looked
into for interest) use phosphorus as the retardant.
Regards
Ian Fox
Goodrich ECS
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: 09 June 2005 14:06
To: [log in to unmask]
Subject: Re: [TN] Fire Retardant
Ken,
Difunctional epoxies begin with brominated bisphenol-A epoxy resin as
the basic building block of FR-4. Most normal boards are NOT using any
PBDE's.
Tetrabromobisphenol-A (TBBPA, I may have one too many B's in the
abbreviation, I'm not a board chemist.) is not an additive, but makes up
a large part of the actual board chemistry. There is a report out there
that shows that this material is not in the same league as the PBDE's
for bioaccumulation and is NOT included in the ban. How that helps.
Regards, Bev RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bloomquist, Ken
Sent: June 9, 2005 8:52 AM
To: [log in to unmask]
Subject: [TN] Fire Retardant
What is the PWB industry using for a fire retardant to replace PBDE's.
Thanks,
KennyB
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