|Application Overview||Cavity Production||Checking Surface Tension and Pre-Treatment||Choice of Glue||Dosage and Setting||Post-Cleaning and Curing|
Checking the Surface Tension
The surface tension is an indicator for the wetting properties of the surface to be glued. A surface tension of at least 38 mN/m is recommended for gluing Swarovski crystals. It should also be randomly tested during production.
It is best to use the Test Pen (art. 9030/000) to measure the surface tension.
Note: On porous or absorbent materials, the surface tension cannot be checked with the Test Pen. If the Test Pen is used on highly polluted surfaces (e.g. grease, oil) or on material like wood, the Test Pen might be polluted as well and cannot be used anymore.
If the surface tension is below 38 mN/m, the following pre-treatment cleaning methods, applied in the correct order, can be effective in reaching the right level. After each cleaning process, the surface tension has to be checked again.
|TYPES OF CLEANING||PRE-TREATMENT CLEANING METHODS|
This involves sanding, blasting or brushing but is usually not necessary for jewelry.
|2||Washing and degreasing
It is important to ascertain that the tensides do not contain silicone, as this would impair adhesion.
When using solvents it is advisable to test the durability of the surface to be cleaned beforehand to avoid any damage. Solvents containing substances with a high boiling point should not be used due to the high risk of residue. If using cleaning agents, wait a few minutes to allow them to evaporate.
|3||Physical cleaning and activation
These cleaning methods can be applied if mechanical cleaning or washing and degreasing are either not possible or have not resulted in a surface tension of > 38 mN/m. Therefore the pre-treatment cleaning method used should be done on a case-by-case basis.
|4||Chemical cleaning and primers
Applying a primer improves adhesion and helps to prevent corrosion.