Test tube and culture tube are made from machine drawn , uniform thickness , low expansion borosilicate glass/ Neutral Glass tubing. The bottoms of these are with uniform thickness to with stand both mechanical and thermal chocks. The rime wherever provided are strong . Test tube ( culture tubes ) with out rim have heavy fire polished end , which is resistance to mechanical shocks of dally use. You will fine that in the long run it is economical to use. |
