peeltesteillä

Peeltesteillä refers to peel testing, a method used to evaluate the adhesion of bonded materials by peeling them apart under controlled conditions. In a typical test, a specimen with an adhesive bond is loaded in a peeling device, and the force required to peel the material from the substrate is recorded as a function of displacement. Tests can use different configurations, most commonly 90-degree and 180-degree peeling, as well as T-peel arrangements where two bonded layers are pulled apart along a common line.

Procedure and interpretation: the specimen is prepared with a defined adhesive laminate and substrate, mounted in a testing machine, and peeled at a constant crosshead speed. The resulting force- displacement data yield a peel strength, often expressed as the peak force divided by the bonded width (N/m), or an average value over a portion of the test. Peel energy per unit area may also be reported. The test is sensitive to factors such as surface preparation, temperature, humidity, peel rate, and angle.

Equipment and standards: universal testing machines with appropriate grips and fixtures are used, sometimes inside environmental chambers. Peel tests are described in various ISO and ASTM guidelines for adhesives and tapes, and many industries apply specifications tailored to films, laminates, packaging, electronics, or medical devices.

Applications and considerations: peel testing informs quality control, material selection, and process optimization across packaging, coatings, textiles, automotive, and electronics. Results depend on materials, substrates, and conditions, so tests should mimic real-service environments for meaningful comparisons.

In Finnish usage, peeltesteillä is the term used to describe performing and interpreting these adhesion tests.