Printec Dyne 38 test pens and inks provide easy and quick results on all types of corona, plasma and flame surfaces for converting and extruding webs and films. The pens are designed to indicate the surface treatment level on polymer substrates and establish that the surface material is correctly treated prior to applying inks, coatings, paints or adhesives. Non-porous substrates such as polyethylene, polypropylene and foils need their surface energies altered in order for flexographic ink adhesion to happen. A method to quickly verify the dyne surface level is via dyne pens. The print operator or quality assurance manager checks the treat level of a substrate prior to printing. This is a quick method to also show which side is treated. In contrast to other dyne inks on the market the Printec LT01649 will dry completely to preserve the test results for future reference, i.e. it will form a closed film (like a printing ink).