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#61
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Elmer's Rubber Cement is not the vulcanizing kind!
Still Just Me wrote:
On Tue, 28 Apr 2009 05:48:46 -0700, jim beam wrote: you've been told three times now. if you don't get it, you have either a fundamental education gap somewhere back in junior school, or you're just too damned dim. Yeah Tom, Jebus H Christ! What'd you sleep through glue properties class in 8th grade? not materials, reading comprehension. like you apparently. moron. |
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#63
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Elmer's Rubber Cement is not the vulcanizing kind!
On 29 Apr, 05:08, wrote:
Trevor Jeffrey wrote: Remove a well adhered patch. *You will see no indication of chemical bond formation. I find a well adhered patch not removable without heating. *Heating affects the REMA patch orange rubber more than the tube rubber so they separate with careful pulling. *I have not cared what remains on the contact surface (it looks clean to me) before applying a new patch and allowing it to cure. I have also removed quite a few patches using a suitable solvent - toluene and xylene are two that work. The hard part seems to be getting a patch edge lifted to gain access to the tube/patch interface. *Once that is accomplished the rest is easy using a slow "peeling" technique in conjunction with more solvent (think "cotton swab"). *Even well adhered patches will come off clean leaving no sign that there was ever a patch adhered/bonded there. Everyone seems to agree on that last detail. I cannot support this for I have had no desire to remove a well adhered patch. *Why? Assuming the rider followed good patching procedures, but chose to ride his freshly patched tube whose patch can lift off radially from the hole, forming the dome I described, without leaking. *Such patches can become slow leaks but in time become "well adhered", requiring special means for removal as described. That is Why! I'm getting splinters under my nails here. |
#64
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Elmer's Rubber Cement is not the vulcanizing kind!
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#65
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Elmer's Rubber Cement is not the vulcanizing kind!
In article ,
Still Just Me wrote: On Tue, 28 Apr 2009 11:56:18 -0700, Michael Press wrote: Electrical forces are what constitute the London and van der Waals forces previously mentioned. To know what is really going on do a year of physics; a year of chemistry; a year of electrodynamics; a year of thermodynamics and statistical physics---alternatively a year of physical chemistry; and a couple years of calculus. MIT puts all their courses complete with problem sets on the web. All of which, as jb noted, are taught in Jr. High. Indeed, I slept through it. -- Michael Press |
#66
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Elmer's Rubber Cement is not the vulcanizing kind!
Tom Keats wrote:
In article , Phil W Lee phil(at)lee-family(dot)me(dot)uk writes: We're being told one substance somehow molecularly intimates and intermingles itself with another similar substance, and yet the process is not chemical. Think of velcro, then reduce in scale to the molecular level. The preparation with rubber cement can be visualised as the process which makes the fibres on one side curl up into little hooks. Aaah, I can visualize that. Thank you. cheers, Tom thank ****. |
#67
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Elmer's Rubber Cement is not the vulcanizing kind!
On Tue, 28 Apr 2009 21:22:28 -0700 (PDT), Nick L Plate
wrote: On 29 Apr, 05:08, wrote: Trevor Jeffrey wrote: Remove a well adhered patch. *You will see no indication of chemical bond formation. I find a well adhered patch not removable without heating. *Heating affects the REMA patch orange rubber more than the tube rubber so they separate with careful pulling. *I have not cared what remains on the contact surface (it looks clean to me) before applying a new patch and allowing it to cure. I have also removed quite a few patches using a suitable solvent - toluene and xylene are two that work. The hard part seems to be getting a patch edge lifted to gain access to the tube/patch interface. *Once that is accomplished the rest is easy using a slow "peeling" technique in conjunction with more solvent (think "cotton swab"). *Even well adhered patches will come off clean leaving no sign that there was ever a patch adhered/bonded there. Everyone seems to agree on that last detail. I cannot support this for I have had no desire to remove a well adhered patch. *Why? Assuming the rider followed good patching procedures, but chose to ride his freshly patched tube whose patch can lift off radially from the hole, forming the dome I described, without leaking. *Such patches can become slow leaks but in time become "well adhered", requiring special means for removal as described. That is Why! I'm getting splinters under my nails here. I think it's time to buy a new tube. |
#68
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Elmer's Rubber Cement is not the vulcanizing kind!
In article ,
Michael Press writes: I think wet newspaper pages are stuck together by air pressure and maybe a li'l static electricity largely introduced by foreign material and dust on the paper. But I'm probably wrong about that, too. It would be nice to know what's really going on. Electrical forces are what constitute the London and van der Waals forces previously mentioned. To know what is really going on do a year of physics; a year of chemistry; a year of electrodynamics; a year of thermodynamics and statistical physics---alternatively a year of physical chemistry; and a couple years of calculus. MIT puts all their courses complete with problem sets on the web. Maybe one of these days I'll get a round tuit. Just need a refresher for the Math (funny, how quickly that stuff falls outa one's brain when you don't use it every day.) As for the rest, I'd just need the books & info. Screw the accreditation. All that studying could really put a hurt onto one's riding time. So, thank you for your kind patience and willingness to help people understand stuff. You are appreciated. cheers, Tom -- Nothing is safe from me. I'm really at: tkeats curlicue vcn dot bc dot ca |
#69
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Elmer's Rubber Cement is not the vulcanizing kind!
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