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testing

OBSERVATIONS SUMMARY

The ingression and dissolving of the PSAadhesive was consistentaround the perimeter, however at various stages some smaller areas of increased ingression would appear. These inconsistencies in ingression advancement point to inconsistency in lamination caused by air voids between the adhesive and circuit layer. These voids enhance the clean- ers' ability to ingress. This simple test shows that 409, Fantastik, Dow Bathroom Cleanerand Lysol Tub and Tile Cleaner are aggressive towards pressure sensi- tive acrylic adhesive. These same cleaners have no effect on the Bergquist HeatSeal switch construction.

FIGURE 12: HeatSeal construction switch soaked in 409 FIGURE 13: PSA construction switch soaked in 409 FIGURE 14: Close-up of fluid ingression into key area (PSA switch soaked in 409) FIGURE 15: PSA construction switches soaked in other cleaners

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