July 16, 2015 Mercury Adhesives

What is blooming (or all this white stuff)?

The phenomenon known as blooming is when the CA vapors leave a white haze behind after curing. This is typically caused by a couple of things. Too much adhesive is used, too much accelerator is used, high humidity environment, and improper ventilation around the part while the CA cures.

If an excessive amount of CA is used you will get excessive gassing during the cure process which will cause blooming. If accelerator is used in excessive amounts it speeds the curing process up so dramatically that you will get a large amount of gassing during the curing process causing blooming. The excessive moisture associated with high humidity acts just like using too much accelerator. Improper ventilation during curing will allow the vapors to build up on the surface and cause blooming.

Blooming is strictly a cosmetic issue and has nothing to do with the quality of the bond, if blooming cannot be tolerated at all than it is good to use a low odor product that will not gas or bloom.