|
|
| Line 1: |
Line 1: |
| − | == Coefficient of Expansion ==
| + | http://www.buyxanaxonlinepill.com/ cheap xanax without a prescription - online xanax |
| − | | + | |
| − | | + | |
| − | When thermal energy is applied to a substance, let's say glass, the energy between the bonds increases and the result is an extension of the bond length. Usually, when a substance cools, it will shrink, thus the bond lengths are shrinking, and vice versa for heating. Thermal expansion and contraction can result in two types of expansion, linear and volumetric.
| + | |
| − | | + | |
| − | '''COE and Glass'''
| + | |
| − | | + | |
| − | Each type of glass that is varied upon its molecular composition will result in a different COE. Although one could create two substances that have identical thermal expansion profiles, glass is typically categorized via it's COE.
| + | |
| − | | + | |
| − | These are some major groups of glass that lampworkers typically come across:
| + | |
| − | | + | |
| − | *COE 32/33: Most industrial [[borosilicate]]
| + | |
| − | *COE 84-87: Common float glass
| + | |
| − | *COE 90: Most Bullseye glass
| + | |
| − | *COE [[96]]: Most spectrum glass
| + | |
| − | *COE 104: Moretti
| + | |
| − | | + | |
| − | '''Compatibility'''
| + | |
| − | | + | |
| − | There are various types of metals and other compounds that are compatible with borosilicate. Gilson opals, silicon as well as other [[inclusions]] may be incorporated into glass. Some materials can be semicompatable, such as some sparkle colors do not like to be encased deep in a marble or vessel. This can be avoided by using these colors on the surface, not encased deep, or a glass worker with a massive amount of experience with a color will know the limitations of the materials. Bad batches of colored glass rod is notorious for cracking problems, most likely an incompatibility of thermal expansion.
| + | |
