Читать книгу Surface Science and Adhesion in Cosmetics - Группа авторов - Страница 23

Adhesion testing measures the adherence quality to a specific substrate after formulation application. This indicates how well a formulation will remain on a consumer’s lips over a period of time. The formulation is applied onto the BIOSKIN surface and left to dry. ASTM crosshatch tape is applied onto the film surface and removed at a 180° angle [54]. The amount of film removed with the tape is rated on a scale from 1-3, where 1 indicates no removal, 2 is some removal, and 3 is severe removal [54]. This scale relates back to how formulations are rated in consumer sensory testing. There are other means to measure the film adhesion; rather than using the ASTM crosshatch tape, two pieces of BIOSKIN can be used in contact with the formulation located in between. One piece of BIOSKIN can be peeled off either manually and the adhesion is evaluated by the ratings described above. Alternatively, a texture analyzer can be used to peel apart the BIOSKIN in order to quantify the force needed for removal.