Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0teVjl-0000P0C; Mon, 22 Jan 96 17:33 CST |
Old-Return-Path: |
|
Date: |
Mon, 22 Jan 1996 16:01:00 -0800 |
Precedence: |
list |
Resent-From: |
|
Cc: |
|
X-Status: |
|
Status: |
O |
X-Mailing-List: |
|
TO: |
"26#e##l#Nancy_Nelson#c##c##l#NELSNNAB#r#_at_#126#FABRIK#r##c##c#25#e#PC_CCMail"@MAIL.FABRIK.COM |
From [log in to unmask] Mon Jan 22 17: |
41:57 1996 |
Return-Path: |
|
Resent-Message-ID: |
<"FnWt4.0.ZaG._w11n"@ipc> |
Subject: |
|
From: |
|
Resent-Sender: |
|
X-Loop: |
|
Message-ID: |
|
Parts/Attachments: |
|
|
The bromine in the flame retardant is not really the problem, it's the
chemistry it's bonded into. The concern in the European Community is
over the Biphenyl and Diphenyl Ether based Bromine compounds like PBB,
PBBO and PBDPE. These break down into brominated dioxins and furans
when they burn.
Two excellent papers on this subject are:
"Standards, bans, and flame retardants.", M. Robert Chistry, Plastics
Compounding Sep/Oct 1993, p. 56-77
"Flame Retardants: Cool Under Fire", Deborah W. Hairston, Chemical
Engineering, Sep 1995, p.65-68
Rogers R/flex 2005 uses a fire retardant filler classed as a
brominated aromatic imide that contains none of the offending
chemistry and is a very stable polymer compound. It uses antimony
pentoxide to provide synergistic flame retardancy, making it more
effective and reducing the amount of filler needed. The pentoxide form
avoids the chemical instability of the more common antimony trioxide
that can potentially poison some plating reactions.
Andrew P. Magee - Applications Engineer
Rogers Corporation - Circuit Materials Unit
Tel: (602) 917-5237
Fax: (602) 917-5256
E-Mail: [log in to unmask]
______________________________ Reply Separator _________________________________
Subject: Alternatives to Bromine in Flame Retardants
Author: Nancy Nelson::(NELSNNAB) at ~FABRIK
Date: 1/19/96 1:51 PM
From: Nancy Nelson
Date: Fri, Jan 19, 1996 1:51 PM
Subject: Alternatives to Bromine in Flame Retardants
To: technet
Does Anyone know of any movement or alternatives
in the industry concerning this.It seems the European Community has
not approved these for use.
What do the Europeans use in their laminate?
Thanks in advance for any response.
Regards,
Nancy Nelson
PCA Engineering Services
Dell Computer Corporation
|
|
|