Dyne test pens are used to verify the surface energy of a material, and the reason for the 6-month shelf life is related to the stability of the solution inside the pen. Over time, the solution may deteriorate and lose its effectiveness, leading to incorrect or unreliable test results. To ensure accurate results, it is recommended to replace the dyne test pen after 6 months or before if the solution inside has visibly changed in color or consistency.
It is also important to store the pens properly to extend their shelf life. Dyne test pens should be stored at room temperature, away from direct sunlight, and in a dry place.
