Re: Heat?
Posted: September 24th, 2006, 9:32 pm
Hey guys,... up for a little experiment???
Allow me to demonstrate how the heating and cooling of the broken glass effects the air and resin in the damage...
First of all, fill your bathroom sink full of water. Then put your hands together (palms together) as if you are about to pray (but hold your hands about 1/2" apart from each other so there is a 1/2" gap between them). Now completely submerge your hands in the water. At this point, think of the water that is between your hands as resin, and your hands represent broken glass. We know that applying heat to damaged glass swells the glass - closing off the damage (forcing any air and resin that is present in the damage out). When you apply heat to the broken glass, it can swell shut so tight that the damage appears to be filled, but don't let that fool you. Now press your hands completely together to represent heated glass that has swelled shut. There is no water between your closed hands... right?... in other words, there is no air or resin in the break because the damaged glass is completely swelled shut.
... Now what happens next is quite magical.
Notice how pulling your hands slightly apart draws water back in between your hands. This is exactly what happens when the glass cools, it contracts drawing resin into the break.
And there you have it folks!
I hope my demonstration has been both informative and enlightening. Thank you all for attending.
Allow me to demonstrate how the heating and cooling of the broken glass effects the air and resin in the damage...
First of all, fill your bathroom sink full of water. Then put your hands together (palms together) as if you are about to pray (but hold your hands about 1/2" apart from each other so there is a 1/2" gap between them). Now completely submerge your hands in the water. At this point, think of the water that is between your hands as resin, and your hands represent broken glass. We know that applying heat to damaged glass swells the glass - closing off the damage (forcing any air and resin that is present in the damage out). When you apply heat to the broken glass, it can swell shut so tight that the damage appears to be filled, but don't let that fool you. Now press your hands completely together to represent heated glass that has swelled shut. There is no water between your closed hands... right?... in other words, there is no air or resin in the break because the damaged glass is completely swelled shut.
... Now what happens next is quite magical.
Notice how pulling your hands slightly apart draws water back in between your hands. This is exactly what happens when the glass cools, it contracts drawing resin into the break.
And there you have it folks!
I hope my demonstration has been both informative and enlightening. Thank you all for attending.