Which of these is diallyl phthalate?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Tuesday, March 10, 2009 8:09 PM
To: [log in to unmask]
Subject: Re: [TN] DEHP and/or BPAs
Chris,
Further to what I wrote yesterday: ASTM D3421-75 extraction followed by
a GC based methodology. I don't have details and even if I did, I
believe I would be constrained by an NDA in giving them out. But this
is a start.
Here is some trivia about phthalate world annual production:
1980's; dibutyl phthalate (DBP) 2 million tons (one of REACH's SVHCs)
Now; dibutyl phthalate (DBP) 450,000 tons Today; dionyl phthalate 60,000
- 100,000 tonnes (in Europe only)
1984: di(2-ethylhexyl) phthalate (DEHP) 110 million tons (one of REACH's
SVHCs) Dictionary of Environmentally Important Chemicals by D. C. Ayres,
Desmond Hellier
Today: di-octyl (another name for DEHP), di-isononyl, di-isodecyl +
other
C7-C13 chain phthalates 5 million tons
www.tecnon.co.uk/gen/z_sys_Products.aspx?productid=31
Note, one of the two above must be wrong.
DEHP has its own website! Doesn't say anything about world production.
http://www.dehp-facts.com/default.aspx?page=5
Phthalates are added to PVC as a plastisizers in the range of 20 - 40%
and sometimes up to 55%! No wonder things fail the REACH criteria of
0.1% of total article weight, never mind thinking about RoHS's limit at
the "homogeneous material that is mechanically separable" level.
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Monday, March 09, 2009 8:58 PM
To: [log in to unmask]
Subject: Re: [TN] DEHP and/or BPAs
Chris,
I would be very surprised if DEHP is used in ordinary printed circuit
boards. Phthalates of this type are usually added to plastics to make
them more pliable. So the main place to look for them is in wire and
cable sheathing.
With regards to bisphenol A, it could conceivably be present as an
impurity in tetrabromobiphenol A, but even if it was, the TBBPA (and any
BPA) would/should be polymerized in the formation of the final board
polymer. I equivocate because it would depend on the ratio of starting
materials and how complete the reaction is. We really need one of the
board guys to speak to this.
I will see if I can have an answer to yoru second question tomorrow.
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Mahanna
Sent: Monday, March 09, 2009 7:20 PM
To: [log in to unmask]
Subject: [TN] DEHP and/or BPAs
Are they used in Pbs? How would/could one test for their presence in a
completed board?
Chris
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