Accurate Method for Sward Hardness Testing
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Determining the physical properties of flexible films is important when predicting the performance of the film after application to a surface. A typical example would be that of a photoresist film used as a mask. If the film is too hard, or too resilient, it will have a tendency to either lift or pull away from the surface, allowing foreign matter to penetrate under the mask. One of the methods used to measure film hardness is the Sward Rocker Hardness Tester*. It basic (Image Omitted) ally consists of a wheel with an off-set weight. The wheel is positioned on the film to be tested such that the weight, normally at the bottom, is turned perpendicular to the film. The wheel is released allowing it to freely rock back and forth until it stops rocking.