Why does glass get elastic when immersed in HF; like this video??? Hi, I was surfing YouTube and came across a very interesting video... Check it out yourself; http://youtu.be/gzUDjHDj0fQ" [Broken] Why did the glass become elastic??? I was thinking it might be due to destruction of some bonds on SiO2 but not all causing mobility of the molecules such that they slide over one and other??? But its just a guess, I have no idea. Thanks in advance.