Flux is a highly acidic substance that is used in the manufacture of PCBs to remove oxides from contact surfaces and chemically prepare them for soldering. An ideal flux helps create strong solder joints while leaving a minimal amount of residue to be cleaned post soldering. Traditionally rosin based fluxes were used, but more and more companies have switched to highly active (ORH1), water based, no clean fluxes. These new fluxes are able to more easily dissolve oxides due to their stronger acidic characteristics plus they don’t require a cleaning process which helps reduce manufacturing costs.
However, ORH1 fluxes can cause significant damage to standard polyimide barcode label materials. Because the fluxes are sprayed, brushed or dipped they tend to sit on the surface of the PCB and labels which, once exposed to heat, can dissolve the top coat, degrade the printed barcode image and/or cause adhesive failures.
With PCBs continuing to get smaller, they often they need to be mechanically secured during the reflow process with a clip or fixture. This raises the risk of the tracking labels being contacted directly by holding device which can potentially cause damage to the top coat.
Polyonics has developed an ultra-durable top coat chemistry that is resistant to the harshest fluxes in the industry including ORX1. These ultra-durable topcoats can resist softening and will not yellow at elevated temperatures plus they exhibit excellent abrasion resistance when directly contacted.
The XF-731 (1 mil) and XF-732 (2 mil) are thermal transfer printable polyimide label materials that include Polyonics latest ultra-durable semi-gloss white topcoats. They also include aggressive one and two mil acrylic pressure sensitive adhesive systems and are designed specifically to provide barcode tracking of printed circuit boards and electronic components through the harshest of PCB manufacturing processes.
You must be logged in to post a comment.