According to the PSTC standard test condition, appendix A, standard conditions are a temperature of 23 ± 1 degree C and a relative humidity (RH) of 50 ± 2% at that temperature, allowing for short term fluctuation of 23 ± 2 degrees C and RH as 50 ± 5%.

The above standard test condition is rather difficult to achieve in some hot and humid counties, such as those countries in southern Asia and China. As a result, pressure sensitive adhesion test is commonly carried out at 25 ± 2 degrees C and RH of 65 ± 5%.

In many of the previous articles, the effect of test temperature on adhesion performance has been widely discussed. The rheological property, such as G’ and Tan delta, of HMPSA (Hot Melt Pressure Sensitive Adhesive) is affected by… Read Complete Article>>

Humidity and Hot Melt Pressure Sensitive Adhesives
-by Pierce Covert, Glue Machinery Corporation