Sorry, Edward, but that's not true. The only common solvents which are
controlled under the Protocol are carbon tetrachloride Annex B, Group
II), CFC-113 (Annex A, Group I), 1,1,1-trichloroethane (Annex B, Group
III) and various HCFCs (Annex C Group I). CBM may also be used as a
solvent and is controlled under Annex C Group III). Production and
import of the first three have been banned since 1 Jan 1996 in developed
nations, but developing countries, defined under Article 5 (1) of the
Protocol, can continue manufacturing and importing them with specified
reductions until the end of 2009. HCFCs may be used in developed
countries with severe restrictions until 2030 {2040 in Art 5(1)
countries). CBM is phased out in all countries as from 1 Jan 2002.
Methylene chloride (BTW, synonymous with DCM, not a different solvent),
trichloroethylene (TCE) and perchloroethylene (PCE) are NOT controlled
under the Protocol and can be freely used anywhere, subject to national
regulations. So can any other halogenated solvents that I have not
specifically mentioned above, although n-propyl bromide (nPB) is under
scrutiny by the Parties to the Protocol for possible inclusion as a
controlled substance. The decision on this can be made only after new
modelling has been developed, because it is more the atmospheric
decomposition products, rather than the substance itself, which are
likely to affect the ozone layer. The Scientific Assessment Panel is
busy working on this problem!
Brian
Edward Szpruch wrote:
> Brian,
> I believe Methylene Chloride and DCM are on the list of materials outlawed
> by Montreal Protocol as Ozone depleting solvents.
> Edward
>
> Edward Szpruch
> Eltek Ltd
> P.O.Box 159 ; 49101 Petah Tikva Israel
> Tel ++972 3 9395050 , Fax ++972 3 9309581
> e-mail [log in to unmask]
>
>
>>-----Original Message-----
>>From: Brian Ellis [SMTP:[log in to unmask]]
>>Sent: ד אוקטובר 30 2002 9:53
>>To: [log in to unmask]
>>Subject: Re: [TN] Acetone Test for Solder Mask
>>
>>Don
>>
>>Methylene chloride or dichloromethane (DCM) may be LISTED as a
>>carcinogen by some idiotic organisations but large scale toxicological
>>and epidemiological tests with cohort groups totalling over 10,000
>>persons who have been industrially exposed to PROVE that it is NOT
>>carcinogenic to humans. This gross error was brought about because
>>testing on rodents did show slight carcinogenicity at very high exposure
>>levels but these rodents have a metabolic path that simply is not
>>present in humans. The European Centre for Toxicology and Ecotoxicology
>>(ECETOC) have published very serious studies on all the available data
>>for DCM, TCE and PCE, written and peer reviewed by the best brains in
>>the business. My interpretation of one of their findings is: if every
>>single adult in the USA were exposed to DCM at 50 ppm for 8 hours/day, 5
>>days/week between the ages of 20 and 65, there would (statistically) be
>>1 death due to DCM-related cancer up to the age of 85 every 200 years. I
>>can quote many references to support this, if required. I can also quote
>>more detailed facts and figures. I should mention that I have no
>>interest in chlorinated solvents; in fact, I avoid them where possible,
>>but it isn't always possible, because they are very useful molecules.
>>
>>This is not to say that DCM is not toxic. It is. Unfortunately, even if
>>it does not cause cancer, it has an insidious effect on the human body
>>at high exposure levels, with a threshold starting about 250 ppm. One of
>>the metabolic breakdown products of DCM is carbon monoxide. This
>>combines with the haemoglobin in the blood to form carboxyhaemoglobin
>>(COHb). This is relatively persistent (several weeks) and COHb molecules
>>are Hb molecules that cannot transport oxygen to the various organs.
>>This can cause suffocation. It accumulates to an equilibrium level, in
>>relation to the exposure level, over a matter of weeks. I know of no
>>case resulting in death, but there are cases on record where the
>>patients had to be hospitalised for a few weeks with combined oxygen
>>therapy and blood exchange. Of course, these patients had been exposed
>>to really massive, consistent, levels.
>>
>>All halogenated solvents must be treated with respect with minimal
>>exposure levels, but it really gets my back up when political bodies who
>>should know better make sweeping statements resulting in unnecessary
>>restrictions and which cannot be scientifically supported:
>>carcinogenicity of DCM is only one, have a thought about lead in solder
>>for another.
>>
>>Brian
>>
>>Don Vischulis wrote:
>>
>>>I believe that the methylene chloride cure test was originally used for
>>
>>one
>>
>>>and two part screened masks. It was later modified for use with dry
>>
>>film
>>
>>>masks. I don't know the origin of the "acetone test", but my guess is
>>
>>that
>>
>>>somebody decided to use acetone instead of methylene chloride because
>>>methylene chloride is listed as a carcinogen. I know that methylene
>>>chloride is not acceptable for use with UV cure and several LPI masks.
>>>
>>>Anyone else?
>>>
>>>Don Vischulis
>>>
>>>-----Original Message-----
>>>From: TechNet [mailto:[log in to unmask]]On Behalf Of Bev Christian
>>>Sent: Tuesday, October 29, 2002 1:19 PM
>>>To: [log in to unmask]
>>>Subject: Re: [TN] Acetone Test for Solder Mask
>>>
>>>
>>>Carrie,
>>>I don't know about acetone, but the test you are talking about sounds
>>
>>like
>>
>>>IPC-TM-650 Test Methods Manual,number 2.3.23, "Cure (Permanency)
>>
>>Thermally
>>
>>>Cured Solder Mask", where they talk about using methylene chloride.
>>>
>>>Perhaps your test is out of the old, what was it, SM840? Anyone else?
>>>
>>>regards,
>>>Bev Christian
>>>Research in Motion
>>>
>>>-----Original Message-----
>>>From: Morse, Carrie [mailto:[log in to unmask]]
>>>Sent: October 29, 2002 2:08 PM
>>>To: [log in to unmask]
>>>Subject: [TN] Acetone Test for Solder Mask
>>>
>>>
>>>We are currently doing an "Acetone Test" on our incoming PWB's to test
>>
>>for
>>
>>>solder mask cure.
>>>Our test entails saturating a swab with acetone and rubbing it on the
>>
>>mask.
>>
>>>Does anyone know where this test comes from? Is it a documented IPC
>>
>>test?
>>
>>>Also, if we do see any residue (i.e.: green or blue discoloration on
>>
>>the
>>
>>>swab), what does this
>>>tell us and how much is enough to deem the test "failed"?
>>>
>>>-Carrie
>>>
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