Fred,
I will be really, really picky here. Teflon is NOT a halogen. It IS a
halogen-containing material. Halogens are fluorine, chlorine, bromine,
iodine and astatine.
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Frederick Miller
Sent: June 9, 2005 10:48 AM
To: [log in to unmask]
Subject: Re: [TN] Fire Retardant
It is also interesting that Teflon is not considered a Halogen.
**************************
Frederick H. Miller PE
Astrolab, Inc.
4 Powder Horn Drive
Warren, NJ 07059
Tel: 732-560-3800
Fax: 732-560-9570
www.astrolab.com
[log in to unmask]
*****************************
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Dehoyos, Ramon
Sent: Thursday, June 09, 2005 10:36 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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