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Science Forum Index » Chemistry Forum » How to cut flask neck?
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| SNUMBER6 |
 Posted: Wed Dec 31, 2003 10:07 am |
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Like the multiplication tables also ???
Quote: Mark (I just got some Viagra to correct my
male dysfunction problem. It works great.
However, with my Alzheimer's, I forget
what to do with it 
Well ... if your hair is spikey ... I know you mixed up your Rogaine with your
Viagra ...
Be seeing you
In the Village
Number 6 |
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| Greg Trollope |
| Posted: Thu Jan 01, 2004 1:34 am |
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Wrap a length of Nichrome wire once around the neck (presumed to be glass).
Pass enough current through the wire to heat it to a dull red heat, and
voila - the glass breaks at the point of contact.
Take care.
Greg
"DaveC" <me@privacy.net> wrote in message
news:0001HW.BC13049C018058C0F0080600@news.individual.net...
Quote: http://www.crscientific.com/boilingflasks.html
I want to trim the neck of this 100 ml flask down to the body, or as close
as
is practical.
How does one cut lab glass without destroying it completley?
Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
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| William Penrose |
| Posted: Thu Jan 01, 2004 1:12 pm |
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On Sat, 27 Dec 2003 9:42:52 -0800, DaveC <me@privacy.net> wrote:
Quote: http://www.crscientific.com/boilingflasks.html
I want to trim the neck of this 100 ml flask down to the body, or as close as
is practical.
How does one cut lab glass without destroying it completley?
Thanks,
I wouldn't even try it without a good glass saw. Since few labs
maintain a glass shop these days, you can send it away to one of
several jobbers to have it done.
However, your flask is priced at $3, which leads me to suspect that it
is plain borosilicate or flint glass.
There is an old trick of tying a cotton string around a bottle,
soaking it with decane or propanol. Set fire to it and let it almost
burn out, then douse with cold water. A flint or borosilicate bottle
will often just fall cleanly apart, ready for a little fire polishing.
It probably won't work with Pyrex.
Bill Penrose |
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| Mark Thorson |
| Posted: Thu Jan 01, 2004 1:51 pm |
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| fkasner |
| Posted: Thu Jan 01, 2004 4:12 pm |
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William Penrose wrote:
Quote: On Sat, 27 Dec 2003 9:42:52 -0800, DaveC <me@privacy.net> wrote:
http://www.crscientific.com/boilingflasks.html
I want to trim the neck of this 100 ml flask down to the body, or as close as
is practical.
How does one cut lab glass without destroying it completley?
Thanks,
I wouldn't even try it without a good glass saw. Since few labs
maintain a glass shop these days, you can send it away to one of
several jobbers to have it done.
However, your flask is priced at $3, which leads me to suspect that it
is plain borosilicate or flint glass.
There is an old trick of tying a cotton string around a bottle,
soaking it with decane or propanol. Set fire to it and let it almost
burn out, then douse with cold water. A flint or borosilicate bottle
will often just fall cleanly apart, ready for a little fire polishing.
It probably won't work with Pyrex.
Bill Penrose
You distinguish borosilicate glass from Pyrex glass?
FK |
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| Bruce Hamilton |
| Posted: Thu Jan 01, 2004 8:46 pm |
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Mark Thorson <nospam@sonic.net> wrote:
"Pyrex" is one form of borosilicate glass ( the low expansion form, which had
an expansion coefficient about 50% of the high expansion form ). The high
expansion form was commonly called " borosilicate glass " around here, and
these days is mainly restricted to specialist glass containers.
As noted above, the high expansion form doesn't have the thermal shock
resistance of the low expansion form, and has mainly been replaced by the low
expansion form in many applications.
Bruce Hamilton. |
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| John |
| Posted: Thu Jan 01, 2004 9:02 pm |
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A diamond encrusted garrote will do nicely.
--
John
If you Reply, be sure and remove the " (DELETE_THIS) " from the email
address.
"DaveC" <me@privacy.net> wrote in message
news:0001HW.BC13049C018058C0F0080600@news.individual.net...
Quote: http://www.crscientific.com/boilingflasks.html
I want to trim the neck of this 100 ml flask down to the body, or as close
as
is practical.
How does one cut lab glass without destroying it completley?
Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
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| William Penrose |
| Posted: Fri Jan 02, 2004 6:37 pm |
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On Thu, 01 Jan 2004 21:12:15 GMT, fkasner <fkasner@rcn.com> wrote:
Quote: William Penrose wrote:
It probably won't work with Pyrex.
Bill Penrose
You distinguish borosilicate glass from Pyrex glass?
FK
Ok, green glass and grey glass. How's that?
Bill Penrose |
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| Martin |
| Posted: Sun Jan 04, 2004 6:27 am |
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I must admit I did not read all the threads to this subject, so please
bare with me if what I have to contribute is redundant.
When reading the thread, I came to think about an old trick I once was
told about. The word 'trick' is very deliberate since I am not sure if
it can be utilized as anything more than a cool trick. The
introduction to the trick is something like "I bed I can cut a flask
in two using this cotton string." When the "victim" has agreed to this
bed, the string (typically a piece of knitting yarn) is soked in
alcohol and tied around the bottle. The string is lit and aloud to
burn for several second, then the bottle is plunged into a cold water
bath. The fast cooling causes the glass to fracture where the string
was heating it.
Supposedly a very cool trick (although I haven't tryed it myself) but
I don't know if it has any practical use. Just thought I'd mention it.
Martin |
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| Cary Kittrell |
| Posted: Mon Jan 05, 2004 7:47 am |
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In article <a1b69803.0401040327.1e88e9b7@posting.google.com> unileps@hotmail.com (Martin) writes:
<I must admit I did not read all the threads to this subject, so please
<bare with me if what I have to contribute is redundant.
<
<When reading the thread, I came to think about an old trick I once was
<told about. The word 'trick' is very deliberate since I am not sure if
<it can be utilized as anything more than a cool trick. The
<introduction to the trick is something like "I bed I can cut a flask
<in two using this cotton string." When the "victim" has agreed to this
<bed, the string (typically a piece of knitting yarn) is soked in
<alcohol and tied around the bottle. The string is lit and aloud to
<burn for several second, then the bottle is plunged into a cold water
<bath. The fast cooling causes the glass to fracture where the string
<was heating it.
<Supposedly a very cool trick (although I haven't tryed it myself) but
<I don't know if it has any practical use. Just thought I'd mention it.
<
<Martin
When, as a kid, I was in need of a glass funnel, my father tied
three short pieces of wood around a bottle -- lengthwise, parallel
to the long axis of the bottle, every 120 degrees -- with each
stick having a small notch cut into it. He then threaded a string
a turn or two around the bottle, using the three notches as grooves
to hold the string loosely in place. He then "sawed" the bottle
vigorously by pulling first on one end of the string, then the
other, much like someone using a bow-and-stick setup to start
a fire. After sawing for a while, he plunged the bottle in
cold water and <ZNICK!!>, the bottle parted cleanly along
the plane formed by the string.
All I recall about the bottle is that it was brown, probably
came with some commercial produce. It was doubtless a some "soft",
high-expansion glass.
-- cary |
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