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Phosphorus is commonly misspelled "phosphorous". It is an essential component of living systems and is found in nervous tissue, bones and cell protoplasm. Phosphorus exists in several allotropic forms including white (or yellow), red, and black (or violet). White phosphorus has two modifications. Ordinary phosphorus is a waxy white solid. When pure, it is colourless and transparent. It is insoluble in water, but soluble in carbon disulphide. It catches fire spontaneously in air, burning to P4O10, often misnamed as phosphorus pentoxide. When exposed to sunlight, or when heated in its own vapour to 250°C, it is converted to the red variety. This form does not ignite spontaneously and it is a little less dangerous than white phosphorus. The red modification is fairly stable and sublimes with a vapour pressure of 1 atmosphere at 417°C.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Franklin D Asbell
Sent: Thursday, June 09, 2005 11:24 AM
To: [log in to unmask]
Subject: Re: [TN] Fire Retardant
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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