Why doesn't glue stick to the inside of the tube?
"Most of our glues contain agents called cure promoters, which cause the glue to bond, and stabilizers,
which stop it from doing so,"
explains Gary Tremley, senior packaging engineer at British firm Loctite.
Inside the tube, the balance between cure promoters and stabilizers is like two people pulling on opposite ends of a rope.
The surface of the inside of the tube is specially formulated to be neutral so that the two agents remain balanced.
Once the glue is out of the tube, the stabilizers are over come by moisture in the air and by contact with the surface you want to stick, so the glue hardens and bonds.
Interesting, who actually wonder about this?
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