New substitute for methylene chloride
Borothene
As you know the TLV for methylene chloride has been lowered from 500 to 25
ppm for an 8 hour workday. This makes it impossible to use in most
adhesive, coating, cleaning and pain stripping applications. Borothene
Solvent is an exact replacement for methylene chloride in every case. It
has a 200 ppm exposure limit and is non-flammable as well as fast
evaporating. If you would like more information please contact me.
Thank You,
Rich
Uncle Al Schwartz
I can appreciate CH2Cl2 and the Environmentalist pogrom against it - inexpensive,
effective, safe; hundreds of billions of man-hours of exposure logged vs a few
rats stuffed until their little pink eyes bulge and careful statistics show
"cancer suspect."
"Borothene" is gobbledygook. Post its chemistry and physical constants.
Have "they" gotten around to stuffing rats with it yet?
--
Alan "Uncle Al" Schwartz
Uncl...@ix.netcom.com ("zero" before @)
unc...@uvic.ca (summer only, cAsE-sensitive!)
http://www.ultra.net.au/~wisby/uncleal.htm
(Toxic URL! Unsafe for children, Democrats, and most mammals)
"Quis custodiet ipsos custodes?" The Net!
Bruce Hamilton
In article <338871...@uvic.ca>
Uncle Al Schwartz <unc...@uvic.ca> writes:
>I can appreciate CH2Cl2 and the Environmentalist pogrom against it - inexpensive,
>effective, safe; hundreds of billions of man-hours of exposure logged vs a few
>rats stuffed until their little pink eyes bulge and careful statistics show
>"cancer suspect."
Actually, there has been major concern about MeCl2 for quite a time,
as we discovered when we used it in our pilot plant. Despite following
all the H&S recommendations and complying with the TLV limits,
several staff became ill and lost a lot of weight after working with it
for a couple of weeks. A review of the H&S literature made us
realise that most major users were apparently controlling ambient
air levels well below the limit to minimise solvent losses, and thus
their workers were not exposed to the solvent. Good to see that
it has come down to more sensible limits - maybe casual users
won't be unpleasantly surprised, as we were.
Bruce Hamilton
Mike Wright
In article <338871...@uvic.ca>, Uncle Al Schwartz <unc...@uvic.ca>
writes
>Borothene wrote:
>>
>> As you know the TLV for methylene chloride has been lowered from 500 to 25
>> ppm for an 8 hour workday. This makes it impossible to use in most
>> adhesive, coating, cleaning and pain stripping applications. Borothene
>> Solvent is an exact replacement for methylene chloride in every case. It
>> has a 200 ppm exposure limit and is non-flammable as well as fast
>> evaporating. If you would like more information please contact me.
>
>inexpensive,
>effective, safe; hundreds of billions of man-hours of exposure logged vs a few
>rats stuffed until their little pink eyes bulge and careful statistics show
>"cancer suspect."
>
>Have "they" gotten around to stuffing rats with it yet?
>
some other halogenated sovents, the commercial product contains 1,2-
epoxybutane inhibitor, 0.1-2% by weight according to source. The
variation in inhibitor concentration may be of some concern to users.
--
Mike Wright, HSL Sheffield UK
Uncle Al Schwartz
I see. Dichloromethane is an Official deadly hazard. The more chemically reactive
and much more lipophilic bromochloromethane gets a clean bill of health. And we all
know how biologically harmless low molecular weight epoxides are - ETO, for instance.
"I can appreciate CH2Cl2 and the Environmentalist pogrom against it - inexpensive,
effective, safe..." On the nosey!
Eric Lucas
Mike Wright wrote:
>
> In article <338871...@uvic.ca>, Uncle Al Schwartz <unc...@uvic.ca>
> writes
> >Borothene wrote:
> >>
> >> As you know the TLV for methylene chloride has been lowered from 500 to 25
> >> ppm for an 8 hour workday. This makes it impossible to use in most
> >> adhesive, coating, cleaning and pain stripping applications. Borothene
> >> Solvent is an exact replacement for methylene chloride in every case. It
> >> has a 200 ppm exposure limit and is non-flammable as well as fast
> >> evaporating. If you would like more information please contact me.
> >
> >I can appreciate CH2Cl2 and the Environmentalist pogrom against it -
> >inexpensive,
> >effective, safe; hundreds of billions of man-hours of exposure logged vs a few
> >rats stuffed until their little pink eyes bulge and careful statistics show
> >"cancer suspect."
> >
> >"Borothene" is gobbledygook. Post its chemistry and physical constants.
> >Have "they" gotten around to stuffing rats with it yet?
> >
> Borothene is chlorobromomethane CAS no 74-97-5, Bpt 68C, d=1.75. Like
> some other halogenated sovents, the commercial product contains 1,2-
> epoxybutane inhibitor, 0.1-2% by weight according to source. The
> variation in inhibitor concentration may be of some concern to users.
If Borothene is indeed bromochloromethane, knowing what I do about
organic chemistry, I would be *very* surprised if it isn't in fact far
more toxic and carcinogenic than methylene chloride (and into the
bargain, it's listed in the Aldrich catalog as light sensitive).
Perhaps the only reason its TLV isn't much lower is that, as Uncle Al
suggests, it hasn't been exposed to the proper battery of tests yet. In
any case, regulations aside, I sure as hell would be a lot more leery of
this one than methylene chloride! But then I guess that depends on
whether you are truly concerned about your workers' health and safety,
or just concerned about meeting some artificial regulation.
Eric Lucas
ISUPrez
>>I can appreciate CH2Cl2 and the Environmentalist pogrom against it -
>>inexpensive, effective, safe; hundreds of billions of man-hours of
exposure
>>logged vs a few rats stuffed until their little pink eyes bulge and
careful statistics
>>show "cancer suspect."
Excellent point, Al. Sounds very familiar.
Andy Williams
Uncle Al Schwartz writes:
>I see. Dichloromethane is an Official deadly hazard. The more chemically reactive
>and much more lipophilic bromochloromethane gets a clean bill of health.
carcinogen, while bromomethyl methyl ether is not. Makes perfect sense,
no? At least they're internally consistent.
--
Andy Williams - real address andywlms at ct2 dot nai dot net
Mike Wright
In article <338B7D...@ix.netcom.com>, Eric Lucas <ealucas*antispam*@
ix.netcom.com> writes
>
>
>If Borothene is indeed bromochloromethane, knowing what I do about
>organic chemistry, I would be *very* surprised if it isn't in fact far
>more toxic and carcinogenic than methylene chloride (and into the
>bargain, it's listed in the Aldrich catalog as light sensitive).
>Perhaps the only reason its TLV isn't much lower is that, as Uncle Al
>suggests, it hasn't been exposed to the proper battery of tests yet. In
>any case, regulations aside, I sure as hell would be a lot more leery of
>this one than methylene chloride! But then I guess that depends on
>whether you are truly concerned about your workers' health and safety,
>or just concerned about meeting some artificial regulation.
>
> Eric Lucas
You can be assured that borothene and bromochloromethane are the same.
At least that is what our HP5972 MS tells us. Our primary job however
was to measure epoxybutane inhibitor concentrations. I cannot comment or
speculate on the toxicology. I saw the original borothene posts several
times and like others was irritated by their lack of information.
Having some recent personal knowledge I saw no reason not to place the
facts as I knew them in the public domain.
Gabriel Tojo
CH2BrCl safer than CH2Cl2!!!
It does not make any chemical sense whatsoever to me. As any student of
Organic Chemistry knows, bromide is a better leaving group than
chloride. CH2BrCl must be much better alkylating the DNA and producing
mutations that eventually lead to cancer. Furthermore the C-Br bond is
weaker and breaks with light, producing most probably, very nasty stuff.
Following the trend we should change from CH2Cl2 to CH2I2!!
Perhaps some chemical companies think that dichloromethane is too cheap
to get a good profit on it.
CH2BrCl is 6 times more expensive than CH2Cl2 on a weight basis
(Aldrich).
Gabriel Tojo
Darryl Evanoff
Chemistry in Britain, volume 32, number 10, p. 11 (October 1996) had
an interesting article titled "Clean bill for methylene chloride."
It appears that a study from Zeneca's Central Toxicology Lab. supports
claims that CH2Cl2 is not a human carcinogen. Furthermore, the use of
alternatives (not indicated) may pose a "much greater risk to health."
Darryl.
On Tue, 27 May 1997 16:57:37 -0700, Uncle Al Schwartz
<unc...@uvic.ca> wrote:
>Mike Wright wrote:
>>
>> In article <338871...@uvic.ca>, Uncle Al Schwartz <unc...@uvic.ca>
>> writes
>> >Borothene wrote:
>> >>
>> >> As you know the TLV for methylene chloride has been lowered from 500 to 25
>> >> ppm for an 8 hour workday. This makes it impossible to use in most
>> >> adhesive, coating, cleaning and pain stripping applications. Borothene
>> >> Solvent is an exact replacement for methylene chloride in every case. It
>> >> has a 200 ppm exposure limit and is non-flammable as well as fast
>> >> evaporating. If you would like more information please contact me.
>> >
>> >I can appreciate CH2Cl2 and the Environmentalist pogrom against it -
>> >inexpensive,
>> >effective, safe; hundreds of billions of man-hours of exposure logged vs a few
>> >rats stuffed until their little pink eyes bulge and careful statistics show
>> >"cancer suspect."
>> >
>> >"Borothene" is gobbledygook. Post its chemistry and physical constants.
>> >Have "they" gotten around to stuffing rats with it yet?
>> >
>> Borothene is chlorobromomethane CAS no 74-97-5, Bpt 68C, d=1.75. Like
>> some other halogenated sovents, the commercial product contains 1,2-
>> epoxybutane inhibitor, 0.1-2% by weight according to source. The
>> variation in inhibitor concentration may be of some concern to users.
>> --
>> Mike Wright, HSL Sheffield UK
>
>I see. Dichloromethane is an Official deadly hazard. The more chemically reactive
>and much more lipophilic bromochloromethane gets a clean bill of health. And we all
>know how biologically harmless low molecular weight epoxides are - ETO, for instance.
>
>"I can appreciate CH2Cl2 and the Environmentalist pogrom against it - inexpensive,